From cfe9251ea6184c02e957d504b3d8e96a54db1c4e Mon Sep 17 00:00:00 2001
From: baseballyama <xydybaseball@gmail.com>
Date: Sun, 2 Feb 2025 23:12:02 +0900
Subject: [PATCH] feat: add `no-unused-props` rule

---
 .changeset/twelve-beers-talk.md               |   5 +
 README.md                                     |   1 +
 .../{vite.config.mts => vite.config.ts}       |   0
 docs/rules.md                                 |   1 +
 docs/rules/no-unused-props.md                 | 208 +++++++++++
 .../src/configs/flat/recommended.ts           |   1 +
 .../eslint-plugin-svelte/src/rule-types.ts    |  10 +
 .../src/rules/no-unused-props.ts              | 340 ++++++++++++++++++
 .../eslint-plugin-svelte/src/utils/rules.ts   |   2 +
 .../invalid/_requirements.json                |   3 +
 .../invalid/builtin-shadow-unused-errors.yaml |   4 +
 .../builtin-shadow-unused-input.svelte        |   7 +
 .../invalid/builtin-types-unused-errors.yaml  |  16 +
 .../invalid/builtin-types-unused-input.svelte |  12 +
 .../invalid/class-props-unused-errors.yaml    |   4 +
 .../invalid/class-props-unused-input.svelte   |  18 +
 .../invalid/extends-unused-errors.yaml        |   8 +
 .../invalid/extends-unused-input.svelte       |  15 +
 .../invalid/generic-props-unused-errors.yaml  |   4 +
 .../invalid/generic-props-unused-input.svelte |   8 +
 .../ignored-pattern-partial-config.json       |   7 +
 .../ignored-pattern-partial-errors.yaml       |   8 +
 .../ignored-pattern-partial-input.svelte      |  14 +
 .../invalid/imported-type-check-config.json   |   7 +
 .../invalid/imported-type-check-errors.yaml   |   6 +
 .../invalid/imported-type-check-input.svelte  |   8 +
 .../invalid/imported-type-unused-errors.yaml  |   4 +
 .../invalid/imported-type-unused-input.svelte |   8 +
 .../index-signature-no-rest-errors.yaml       |   9 +
 .../index-signature-no-rest-input.svelte      |  10 +
 .../invalid/intersection-unused-errors.yaml   |   8 +
 .../invalid/intersection-unused-input.svelte  |  19 +
 .../multiple-extends-unused-errors.yaml       |   8 +
 .../multiple-extends-unused-input.svelte      |  19 +
 .../invalid/nested-unused-errors.yaml         |   4 +
 .../invalid/nested-unused-input.svelte        |  10 +
 .../invalid/optional-unused-errors.yaml       |   8 +
 .../invalid/optional-unused-input.svelte      |  14 +
 .../parent-interface-unused-errors.yaml       |   4 +
 .../parent-interface-unused-input.svelte      |  13 +
 .../no-unused-props/invalid/shared-types.ts   |   3 +
 .../invalid/simple-unused-errors.yaml         |   4 +
 .../invalid/simple-unused-input.svelte        |   8 +
 .../unused-index-signature-errors.yaml        |   5 +
 .../unused-index-signature-input.svelte       |   8 +
 .../no-unused-props/valid/_requirements.json  |   3 +
 .../no-unused-props/valid/any-input.svelte    |   5 +
 .../valid/assignment-input.svelte             |   4 +
 .../no-unused-props/valid/basic-input.svelte  |   8 +
 .../valid/builtin-types-input.svelte          |  18 +
 .../valid/computed-member-input.svelte        |   4 +
 .../valid/computed-property-input.svelte      |   7 +
 .../valid/conditional-type-input.svelte       |  16 +
 .../valid/extends-input.svelte                |  14 +
 .../valid/function-props-input.svelte         |  12 +
 .../ignored-conditional-type-config.json      |   7 +
 .../ignored-conditional-type-input.svelte     |  11 +
 .../valid/imported-type-config.json           |   7 +
 .../valid/imported-type-default-input.svelte  |   8 +
 .../valid/imported-type-explicit-config.json  |   7 +
 .../valid/imported-type-explicit-input.svelte |   8 +
 .../valid/imported-type-input.svelte          |   8 +
 .../valid/index-signature-rest-input.svelte   |   9 +
 .../valid/intersection-type-input.svelte      |  18 +
 .../valid/js-basic-input.svelte               |   4 +
 .../valid/js-jsdoc-input.svelte               |  10 +
 .../valid/js-no-types-input.svelte            |   4 +
 .../no-unused-props/valid/member-input.svelte |   8 +
 .../valid/module-script-input.svelte          |  11 +
 .../multiple-index-signatures-input.svelte    |  10 +
 .../valid/nested-props-input.svelte           |  13 +
 .../valid/new-expression-input.svelte         |   4 +
 .../valid/optional-props-input.svelte         |  14 +
 .../valid/record-type-input.svelte            |  10 +
 .../valid/recursive-type-input.svelte         |   9 +
 .../valid/rename-unused-input.svelte          |  10 +
 .../valid/rest-and-index-input.svelte         |   9 +
 .../valid/rest-with-index-input.svelte        |   8 +
 .../no-unused-props/valid/shared-types.ts     |   3 +
 .../valid/template-usage-input.svelte         |  16 +
 .../valid/typed-props-input.svelte            |   8 +
 .../valid/union-type-input.svelte             |  11 +
 .../valid/used-index-signature-input.svelte   |   9 +
 .../tests/src/rules/no-unused-props.ts        |  12 +
 84 files changed, 1240 insertions(+)
 create mode 100644 .changeset/twelve-beers-talk.md
 rename docs-svelte-kit/{vite.config.mts => vite.config.ts} (100%)
 create mode 100644 docs/rules/no-unused-props.md
 create mode 100644 packages/eslint-plugin-svelte/src/rules/no-unused-props.ts
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/_requirements.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-config.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-config.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/shared-types.ts
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-errors.yaml
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/_requirements.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/any-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/assignment-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/basic-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/builtin-types-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-member-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-property-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/conditional-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/extends-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/function-props-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-config.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-config.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-default-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-config.json
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/index-signature-rest-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/intersection-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-basic-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-jsdoc-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-no-types-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/member-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/module-script-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/multiple-index-signatures-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/nested-props-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/new-expression-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/optional-props-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/record-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/recursive-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rename-unused-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-and-index-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-with-index-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/shared-types.ts
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/template-usage-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/typed-props-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/union-type-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/used-index-signature-input.svelte
 create mode 100644 packages/eslint-plugin-svelte/tests/src/rules/no-unused-props.ts

diff --git a/.changeset/twelve-beers-talk.md b/.changeset/twelve-beers-talk.md
new file mode 100644
index 000000000..ed91087d9
--- /dev/null
+++ b/.changeset/twelve-beers-talk.md
@@ -0,0 +1,5 @@
+---
+'eslint-plugin-svelte': minor
+---
+
+feat: add `no-unused-props` rule
diff --git a/README.md b/README.md
index 01eb6bdfa..0081b9c8e 100644
--- a/README.md
+++ b/README.md
@@ -362,6 +362,7 @@ These rules relate to better ways of doing things to help you avoid problems:
 | [svelte/no-reactive-literals](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-reactive-literals/) | don't assign literal values in reactive statements | :star::bulb: |
 | [svelte/no-svelte-internal](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-svelte-internal/) | svelte/internal will be removed in Svelte 6. | :star: |
 | [svelte/no-unused-class-name](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unused-class-name/) | disallow the use of a class in the template without a corresponding style |  |
+| [svelte/no-unused-props](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unused-props/) | Warns about defined Props properties that are unused | :star: |
 | [svelte/no-unused-svelte-ignore](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unused-svelte-ignore/) | disallow unused svelte-ignore comments | :star: |
 | [svelte/no-useless-children-snippet](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-useless-children-snippet/) | disallow explicit children snippet where it's not needed | :star: |
 | [svelte/no-useless-mustaches](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-useless-mustaches/) | disallow unnecessary mustache interpolations | :star::wrench: |
diff --git a/docs-svelte-kit/vite.config.mts b/docs-svelte-kit/vite.config.ts
similarity index 100%
rename from docs-svelte-kit/vite.config.mts
rename to docs-svelte-kit/vite.config.ts
diff --git a/docs/rules.md b/docs/rules.md
index 5e509b01e..d15cdae9b 100644
--- a/docs/rules.md
+++ b/docs/rules.md
@@ -59,6 +59,7 @@ These rules relate to better ways of doing things to help you avoid problems:
 | [svelte/no-reactive-literals](./rules/no-reactive-literals.md)                           | don't assign literal values in reactive statements                                                                                        | :star::bulb:   |
 | [svelte/no-svelte-internal](./rules/no-svelte-internal.md)                               | svelte/internal will be removed in Svelte 6.                                                                                              | :star:         |
 | [svelte/no-unused-class-name](./rules/no-unused-class-name.md)                           | disallow the use of a class in the template without a corresponding style                                                                 |                |
+| [svelte/no-unused-props](./rules/no-unused-props.md)                                     | Warns about defined Props properties that are unused                                                                                      | :star:         |
 | [svelte/no-unused-svelte-ignore](./rules/no-unused-svelte-ignore.md)                     | disallow unused svelte-ignore comments                                                                                                    | :star:         |
 | [svelte/no-useless-children-snippet](./rules/no-useless-children-snippet.md)             | disallow explicit children snippet where it's not needed                                                                                  | :star:         |
 | [svelte/no-useless-mustaches](./rules/no-useless-mustaches.md)                           | disallow unnecessary mustache interpolations                                                                                              | :star::wrench: |
diff --git a/docs/rules/no-unused-props.md b/docs/rules/no-unused-props.md
new file mode 100644
index 000000000..ad9e59256
--- /dev/null
+++ b/docs/rules/no-unused-props.md
@@ -0,0 +1,208 @@
+---
+pageClass: 'rule-details'
+sidebarDepth: 0
+title: 'svelte/no-unused-props'
+description: 'Warns about defined Props properties that are unused'
+---
+
+# svelte/no-unused-props
+
+> Warns about defined Props properties that are unused
+
+- :exclamation: <badge text="This rule has not been released yet." vertical="middle" type="error"> **_This rule has not been released yet._** </badge>
+- :gear: This rule is included in `"plugin:svelte/recommended"`.
+
+## :book: Rule Details
+
+This rule reports properties that are defined in Props but never used in the component code.  
+It helps to detect dead code and improve component clarity by ensuring that every declared prop is utilized.
+
+This rule checks various usage patterns of props:
+
+- Direct property access
+- Destructuring assignment
+- Method calls
+- Computed property access
+- Object spread
+- Constructor calls (new expressions)
+- Assignment to other variables
+- Index signatures (e.g. `[key: string]: unknown`)
+
+Additionally, this rule checks if index signatures are properly used. When an index signature is defined but not captured using the rest operator (`...`), the rule will suggest using it.
+
+Note: Properties of class types are not checked for usage, as they might be used in other parts of the application.
+
+:warning: This rule requires `@typescript-eslint/parser` to work. Make sure you have installed `@typescript-eslint/parser` and configured it in your ESLint configuration. Therefore, the rule violations cannot be seen in the examples on this page because this documentation does not use `@typescript-eslint/parser`.
+
+<!--eslint-skip-->
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Direct property access
+  const props: { value: string } = $props();
+  console.log(props.value);
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Destructuring assignment
+  const { width, height }: { width: number; height: number } = $props();
+  console.log(width, height);
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Class properties are not checked
+  class User {
+    constructor(
+      public name: string,
+      public age: number
+    ) {}
+  }
+  type Props = {
+    user: User;
+  };
+  const props: Props = $props();
+  console.log(props.user.name); // age is not reported as unused
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Method calls
+  const props2: { callback: () => void } = $props();
+  props2.callback();
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Computed property access
+  const props3: { 'data-value': string } = $props();
+  const value = props3['data-value'];
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Constructor calls
+  const props4: { config: { new (): any } } = $props();
+  new props4.config();
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Using index signature with rest operator
+  interface Props {
+    a: number;
+    [key: string]: unknown;
+  }
+  let { a, ...rest }: Props = $props();
+  console.log(rest);
+</script>
+```
+
+```svelte
+<!-- ✗ Bad Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Unused property 'b'
+  const props: { a: string; b: number } = $props();
+  console.log(props.a);
+</script>
+```
+
+```svelte
+<!-- ✗ Bad Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Unused property in destructuring
+  const { x }: { x: number; y: number } = $props();
+  console.log(x);
+</script>
+```
+
+```svelte
+<!-- ✗ Bad Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: "error" */
+  // Unused index signature
+  interface Props {
+    a: number;
+    [key: string]: unknown; // This will be reported
+  }
+  let { a }: Props = $props();
+</script>
+```
+
+## :wrench: Options
+
+```js
+{
+  "svelte/no-unused-props": ["error", {
+    // Whether to check properties from imported types
+    "checkImportedTypes": false,
+    // Patterns to ignore when checking for unused props
+    "ignorePatterns": []
+  }]
+}
+```
+
+- `checkImportedTypes` ... Controls whether to check properties from imported types. Default is `false`.
+- `ignorePatterns` ... Patterns to ignore when checking for unused props. Default is an empty array.
+
+Examples:
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: ["error", { "checkImportedTypes": true }] */
+  // Check properties from imported types
+  import type { BaseProps } from './types';
+  interface Props extends BaseProps {
+    age: number;
+  }
+  let { name, age }: Props = $props();
+  console.log(name, age);
+</script>
+```
+
+```svelte
+<!-- ✓ Good Examples -->
+<script lang="ts">
+  /* eslint svelte/no-unused-props: ["error", { "ignorePatterns": ["^_"] }] */
+  // Ignore properties starting with underscore
+  interface Props {
+    _internal: string;
+    value: number;
+  }
+  let { value }: Props = $props();
+  console.log(value);
+</script>
+```
+
+## :gear: Required Configuration
+
+This rule requires `@typescript-eslint/parser` to work. Please refer to the [User Guide](../user-guide.md) for more information.
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/sveltejs/eslint-plugin-svelte/blob/main/packages/eslint-plugin-svelte/src/rules/no-unused-props.ts)
+- [Test source](https://github.com/sveltejs/eslint-plugin-svelte/blob/main/packages/eslint-plugin-svelte/tests/src/rules/no-unused-props.ts)
diff --git a/packages/eslint-plugin-svelte/src/configs/flat/recommended.ts b/packages/eslint-plugin-svelte/src/configs/flat/recommended.ts
index fc7f0890f..74b0e03ef 100644
--- a/packages/eslint-plugin-svelte/src/configs/flat/recommended.ts
+++ b/packages/eslint-plugin-svelte/src/configs/flat/recommended.ts
@@ -32,6 +32,7 @@ const config: Linter.Config[] = [
 			'svelte/no-store-async': 'error',
 			'svelte/no-svelte-internal': 'error',
 			'svelte/no-unknown-style-directive-property': 'error',
+			'svelte/no-unused-props': 'error',
 			'svelte/no-unused-svelte-ignore': 'error',
 			'svelte/no-useless-children-snippet': 'error',
 			'svelte/no-useless-mustaches': 'error',
diff --git a/packages/eslint-plugin-svelte/src/rule-types.ts b/packages/eslint-plugin-svelte/src/rule-types.ts
index 30f15c1c2..4eb475231 100644
--- a/packages/eslint-plugin-svelte/src/rule-types.ts
+++ b/packages/eslint-plugin-svelte/src/rule-types.ts
@@ -261,6 +261,11 @@ export interface RuleOptions {
    * @see https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unused-class-name/
    */
   'svelte/no-unused-class-name'?: Linter.RuleEntry<SvelteNoUnusedClassName>
+  /**
+   * Warns about defined Props properties that are unused
+   * @see https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unused-props/
+   */
+  'svelte/no-unused-props'?: Linter.RuleEntry<SvelteNoUnusedProps>
   /**
    * disallow unused svelte-ignore comments
    * @see https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unused-svelte-ignore/
@@ -512,6 +517,11 @@ type SvelteNoUnknownStyleDirectiveProperty = []|[{
 type SvelteNoUnusedClassName = []|[{
   allowedClassNames?: string[]
 }]
+// ----- svelte/no-unused-props -----
+type SvelteNoUnusedProps = []|[{
+  checkImportedTypes?: boolean
+  ignorePatterns?: string[]
+}]
 // ----- svelte/no-useless-mustaches -----
 type SvelteNoUselessMustaches = []|[{
   ignoreIncludesComment?: boolean
diff --git a/packages/eslint-plugin-svelte/src/rules/no-unused-props.ts b/packages/eslint-plugin-svelte/src/rules/no-unused-props.ts
new file mode 100644
index 000000000..1588f3b32
--- /dev/null
+++ b/packages/eslint-plugin-svelte/src/rules/no-unused-props.ts
@@ -0,0 +1,340 @@
+import { createRule } from '../utils/index.js';
+import { getTypeScriptTools } from '../utils/ts-utils/index.js';
+import type { TSESTree } from '@typescript-eslint/types';
+import type ts from 'typescript';
+import { findVariable } from '../utils/ast-utils.js';
+import { toRegExp } from '../utils/regexp.js';
+import { getFilename } from '../utils/compat.js';
+
+type PropertyPath = string[];
+
+export default createRule('no-unused-props', {
+	meta: {
+		docs: {
+			description: 'Warns about defined Props properties that are unused',
+			category: 'Best Practices',
+			recommended: true
+		},
+		schema: [
+			{
+				type: 'object',
+				properties: {
+					checkImportedTypes: {
+						type: 'boolean',
+						default: false
+					},
+					ignorePatterns: {
+						type: 'array',
+						items: {
+							type: 'string'
+						},
+						default: []
+					}
+				},
+				additionalProperties: false
+			}
+		],
+		messages: {
+			unusedProp: "'{{name}}' is an unused Props property.",
+			unusedNestedProp: "'{{name}}' in '{{parent}}' is an unused property.",
+			unusedIndexSignature:
+				'Index signature is unused. Consider using rest operator (...) to capture remaining properties.'
+		},
+		type: 'suggestion',
+		conditions: [
+			{
+				svelteVersions: ['5'],
+				runes: [true, 'undetermined']
+			}
+		]
+	},
+	create(context) {
+		const fileName = getFilename(context);
+		const tools = getTypeScriptTools(context);
+		if (!tools) {
+			return {};
+		}
+
+		const typeChecker = tools.service.program.getTypeChecker();
+		if (!typeChecker) {
+			return {};
+		}
+
+		const options = context.options[0] ?? {};
+		const checkImportedTypes = options.checkImportedTypes ?? false;
+		const ignorePatterns = (options.ignorePatterns ?? []).map((p: string | RegExp) => {
+			if (typeof p === 'string') {
+				return toRegExp(p);
+			}
+			return p;
+		});
+
+		function shouldIgnore(name: string): boolean {
+			return ignorePatterns.some((pattern: RegExp) => pattern.test(name));
+		}
+
+		function shouldIgnoreType(type: ts.Type): boolean {
+			const typeStr = typeChecker.typeToString(type);
+			const symbol = type.getSymbol();
+			const symbolName = symbol?.getName();
+			return shouldIgnore(typeStr) || (symbolName ? shouldIgnore(symbolName) : false);
+		}
+
+		function isExternalType(type: ts.Type): boolean {
+			const symbol = type.getSymbol();
+			if (!symbol) return false;
+
+			const declarations = symbol.getDeclarations();
+			if (!declarations || declarations.length === 0) return false;
+
+			const sourceFile = declarations[0].getSourceFile();
+			return sourceFile.fileName !== fileName;
+		}
+
+		/**
+		 * Extracts property paths from member expressions.
+		 */
+		function getPropertyPath(node: TSESTree.Identifier): PropertyPath {
+			const paths: PropertyPath = [];
+			let currentNode: TSESTree.Node = node;
+			let parentNode: TSESTree.Node | null = currentNode.parent ?? null;
+
+			while (parentNode) {
+				if (parentNode.type === 'MemberExpression' && parentNode.object === currentNode) {
+					const property = parentNode.property;
+					if (property.type === 'Identifier') {
+						paths.push(property.name);
+					} else if (property.type === 'Literal' && typeof property.value === 'string') {
+						paths.push(property.value);
+					} else {
+						break;
+					}
+				}
+				currentNode = parentNode;
+				parentNode = currentNode.parent ?? null;
+			}
+
+			return paths;
+		}
+
+		/**
+		 * Finds all property access paths for a given variable.
+		 */
+		function getUsedNestedPropertyNames(node: TSESTree.Identifier): PropertyPath[] {
+			const variable = findVariable(context, node);
+			if (!variable) return [];
+
+			const paths: PropertyPath[] = [];
+			for (const reference of variable.references) {
+				if ('identifier' in reference && reference.identifier.type === 'Identifier') {
+					const referencePath = getPropertyPath(reference.identifier);
+					paths.push(referencePath);
+				}
+			}
+			return paths;
+		}
+
+		/**
+		 * Checks if a property is from TypeScript's built-in type definitions.
+		 * These properties should be ignored as they are not user-defined props.
+		 */
+		function isBuiltInProperty(prop: ts.Symbol): boolean {
+			const declarations = prop.getDeclarations();
+			if (!declarations || declarations.length === 0) return false;
+
+			const declaration = declarations[0];
+			const sourceFile = declaration.getSourceFile();
+			if (!sourceFile) return false;
+			return sourceFile.fileName.includes('node_modules/typescript/lib/');
+		}
+
+		function getUsedPropertiesFromPattern(pattern: TSESTree.ObjectPattern): Set<string> {
+			const usedProps = new Set<string>();
+			for (const prop of pattern.properties) {
+				if (prop.type === 'Property' && prop.key.type === 'Identifier') {
+					usedProps.add(prop.key.name);
+				} else if (prop.type === 'RestElement') {
+					// If there's a rest element, all properties are potentially used
+					return new Set();
+				}
+			}
+			return usedProps;
+		}
+
+		/**
+		 * Check if the type is a class type (has constructor or prototype)
+		 */
+		function isClassType(type: ts.Type): boolean {
+			if (!type) return false;
+
+			// Check if it's a class instance type
+			if (type.isClass()) return true;
+
+			// Check for constructor signatures
+			const constructorType = type.getConstructSignatures();
+			if (constructorType.length > 0) return true;
+
+			// Check if it has a prototype property
+			const symbol = type.getSymbol();
+			if (symbol?.members?.has('prototype' as ts.__String)) return true;
+
+			return false;
+		}
+
+		/**
+		 * Recursively checks for unused properties in a type.
+		 */
+		function checkUnusedProperties(
+			type: ts.Type,
+			usedPaths: PropertyPath[],
+			usedProps: Set<string>,
+			reportNode: TSESTree.Node,
+			parentPath: string[],
+			checkedTypes: Set<string>,
+			reportedProps: Set<string>
+		) {
+			// Skip checking if the type itself is a class
+			if (isClassType(type)) return;
+
+			const typeStr = typeChecker.typeToString(type);
+			if (checkedTypes.has(typeStr)) return;
+			checkedTypes.add(typeStr);
+			if (shouldIgnoreType(type)) return;
+			if (!checkImportedTypes && isExternalType(type)) return;
+
+			const properties = typeChecker.getPropertiesOfType(type);
+			const baseTypes = type.getBaseTypes();
+
+			if (!properties.length && (!baseTypes || baseTypes.length === 0)) {
+				return;
+			}
+
+			if (baseTypes) {
+				for (const baseType of baseTypes) {
+					checkUnusedProperties(
+						baseType,
+						usedPaths,
+						usedProps,
+						reportNode,
+						parentPath,
+						checkedTypes,
+						reportedProps
+					);
+				}
+			}
+
+			for (const prop of properties) {
+				if (isBuiltInProperty(prop)) continue;
+
+				const propName = prop.getName();
+				const currentPath = [...parentPath, propName];
+				const currentPathStr = [...parentPath, propName].join('.');
+
+				if (reportedProps.has(currentPathStr)) continue;
+
+				const propType = typeChecker.getTypeOfSymbol(prop);
+				const isUsedInPath = usedPaths.some((path) => {
+					const usedPath = path.join('.');
+					return usedPath === currentPathStr || usedPath.startsWith(`${currentPathStr}.`);
+				});
+
+				const isUsedInProps = usedProps.has(propName);
+
+				if (!isUsedInPath && !isUsedInProps) {
+					reportedProps.add(currentPathStr);
+					context.report({
+						node: reportNode,
+						messageId: parentPath.length ? 'unusedNestedProp' : 'unusedProp',
+						data: {
+							name: propName,
+							parent: parentPath.join('.')
+						}
+					});
+				}
+
+				const isUsedNested = usedPaths.some((path) => {
+					return path.join('.').startsWith(`${currentPathStr}.`);
+				});
+
+				if (isUsedNested || isUsedInProps) {
+					checkUnusedProperties(
+						propType,
+						usedPaths,
+						usedProps,
+						reportNode,
+						currentPath,
+						checkedTypes,
+						reportedProps
+					);
+				}
+			}
+
+			// Check for unused index signatures only at the root level
+			if (parentPath.length === 0) {
+				const indexType = type.getStringIndexType();
+				const numberIndexType = type.getNumberIndexType();
+				const hasIndexSignature = Boolean(indexType) || Boolean(numberIndexType);
+
+				if (hasIndexSignature && !hasRestElement(usedProps)) {
+					context.report({
+						node: reportNode,
+						messageId: 'unusedIndexSignature'
+					});
+				}
+			}
+		}
+
+		/**
+		 * Returns true if the destructuring pattern includes a rest element,
+		 * which means all remaining properties are potentially used.
+		 */
+		function hasRestElement(usedProps: Set<string>): boolean {
+			return usedProps.size === 0;
+		}
+
+		return {
+			'VariableDeclaration > VariableDeclarator': (node: TSESTree.VariableDeclarator) => {
+				// Only check $props declarations
+				if (
+					node.init?.type !== 'CallExpression' ||
+					node.init.callee.type !== 'Identifier' ||
+					node.init.callee.name !== '$props'
+				) {
+					return;
+				}
+
+				const tsNode = tools.service.esTreeNodeToTSNodeMap.get(node) as ts.VariableDeclaration;
+				if (!tsNode || !tsNode.type) return;
+
+				const propType = typeChecker.getTypeFromTypeNode(tsNode.type);
+				let usedPaths: PropertyPath[] = [];
+				let usedProps = new Set<string>();
+
+				if (node.id.type === 'ObjectPattern') {
+					usedProps = getUsedPropertiesFromPattern(node.id);
+					if (usedProps.size === 0) return;
+					const identifiers = node.id.properties
+						.filter((p): p is TSESTree.Property => p.type === 'Property')
+						.map((p) => p.value)
+						.filter((v): v is TSESTree.Identifier => v.type === 'Identifier');
+					for (const identifier of identifiers) {
+						const paths = getUsedNestedPropertyNames(identifier);
+						usedPaths.push(...paths);
+					}
+				} else if (node.id.type === 'Identifier') {
+					usedPaths = getUsedNestedPropertyNames(node.id);
+				}
+
+				checkUnusedProperties(
+					propType,
+					usedPaths,
+					usedProps,
+					node.id,
+					[],
+					new Set<string>(),
+					new Set<string>()
+				);
+			}
+		};
+	}
+});
diff --git a/packages/eslint-plugin-svelte/src/utils/rules.ts b/packages/eslint-plugin-svelte/src/utils/rules.ts
index 2a2ddeeda..609859fe1 100644
--- a/packages/eslint-plugin-svelte/src/utils/rules.ts
+++ b/packages/eslint-plugin-svelte/src/utils/rules.ts
@@ -51,6 +51,7 @@ import noTargetBlank from '../rules/no-target-blank.js';
 import noTrailingSpaces from '../rules/no-trailing-spaces.js';
 import noUnknownStyleDirectiveProperty from '../rules/no-unknown-style-directive-property.js';
 import noUnusedClassName from '../rules/no-unused-class-name.js';
+import noUnusedProps from '../rules/no-unused-props.js';
 import noUnusedSvelteIgnore from '../rules/no-unused-svelte-ignore.js';
 import noUselessChildrenSnippet from '../rules/no-useless-children-snippet.js';
 import noUselessMustaches from '../rules/no-useless-mustaches.js';
@@ -123,6 +124,7 @@ export const rules = [
 	noTrailingSpaces,
 	noUnknownStyleDirectiveProperty,
 	noUnusedClassName,
+	noUnusedProps,
 	noUnusedSvelteIgnore,
 	noUselessChildrenSnippet,
 	noUselessMustaches,
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/_requirements.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/_requirements.json
new file mode 100644
index 000000000..0192b1098
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/_requirements.json
@@ -0,0 +1,3 @@
+{
+	"svelte": ">=5.0.0-0"
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-errors.yaml
new file mode 100644
index 000000000..e1178cce7
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'toString' is an unused Props property."
+  line: 5
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-input.svelte
new file mode 100644
index 000000000..2346d9fd3
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-shadow-unused-input.svelte
@@ -0,0 +1,7 @@
+<script lang="ts">
+	interface Props {
+		toString: () => string;
+	}
+	let props: Props = $props();
+	console.log(props);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-errors.yaml
new file mode 100644
index 000000000..75deab84b
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-errors.yaml
@@ -0,0 +1,16 @@
+- message: "'regexp' is an unused Props property."
+  line: 10
+  column: 8
+  suggestions: null
+- message: "'promise' is an unused Props property."
+  line: 10
+  column: 8
+  suggestions: null
+- message: "'map' is an unused Props property."
+  line: 10
+  column: 8
+  suggestions: null
+- message: "'set' is an unused Props property."
+  line: 10
+  column: 8
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-input.svelte
new file mode 100644
index 000000000..4d8f54137
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/builtin-types-unused-input.svelte
@@ -0,0 +1,12 @@
+<script lang="ts">
+	type Props = {
+		date: Date;
+		regexp: RegExp;
+		promise: Promise<string>;
+		map: Map<string, number>;
+		set: Set<string>;
+	};
+
+	const props: Props = $props();
+	console.log(props.date.getTime());
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-errors.yaml
new file mode 100644
index 000000000..218b1030f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'data' is an unused Props property."
+  line: 16
+  column: 8
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-input.svelte
new file mode 100644
index 000000000..3f06f0ab1
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/class-props-unused-input.svelte
@@ -0,0 +1,18 @@
+<script lang="ts">
+	class User {
+		constructor(
+			public name: string,
+			public age: number
+		) {}
+	}
+
+	type Props = {
+		user: User;
+		data: {
+			value: string;
+		};
+	};
+
+	const props: Props = $props();
+	console.log(props.user.name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-errors.yaml
new file mode 100644
index 000000000..0d968bd01
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-errors.yaml
@@ -0,0 +1,8 @@
+- message: "'role' is an unused Props property."
+  line: 13
+  column: 6
+  suggestions: null
+- message: "'email' is an unused Props property."
+  line: 13
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-input.svelte
new file mode 100644
index 000000000..3e0120428
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/extends-unused-input.svelte
@@ -0,0 +1,15 @@
+<script lang="ts">
+	interface BaseProps {
+		id: string;
+		type: 'user' | 'admin';
+		role: string;
+	}
+
+	interface Props extends BaseProps {
+		name: string;
+		email: string;
+	}
+
+	let props: Props = $props();
+	console.log(props.id, props.type, props.name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-errors.yaml
new file mode 100644
index 000000000..7a1f0a0b4
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'extra' is an unused Props property."
+  line: 6
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-input.svelte
new file mode 100644
index 000000000..f65f0de12
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/generic-props-unused-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { GenericProps } from './shared-types';
+	interface Props extends GenericProps<string> {
+		extra: boolean;
+	}
+	let { data, loading }: Props = $props();
+	console.log(data, loading);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-config.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-config.json
new file mode 100644
index 000000000..c049eb81c
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-config.json
@@ -0,0 +1,7 @@
+{
+	"options": [
+		{
+			"ignorePatterns": [".*DTO$"]
+		}
+	]
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-errors.yaml
new file mode 100644
index 000000000..a3a80e9ca
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-errors.yaml
@@ -0,0 +1,8 @@
+- message: "'metadata' is an unused Props property."
+  line: 12
+  column: 8
+  suggestions: null
+- message: "'description' is an unused Props property."
+  line: 12
+  column: 8
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-input.svelte
new file mode 100644
index 000000000..3711e44da
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/ignored-pattern-partial-input.svelte
@@ -0,0 +1,14 @@
+<script lang="ts">
+	type BaseDTO = {
+		id: string;
+		metadata: Record<string, unknown>;
+	};
+
+	type Props = BaseDTO & {
+		name: string;
+		description: string;
+	};
+
+	const props: Props = $props();
+	console.log(props.id, props.name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-config.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-config.json
new file mode 100644
index 000000000..2b42ee30f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-config.json
@@ -0,0 +1,7 @@
+{
+	"options": [
+		{
+			"checkImportedTypes": true
+		}
+	]
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-errors.yaml
new file mode 100644
index 000000000..2f341476f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-errors.yaml
@@ -0,0 +1,6 @@
+- message: "'name' is an unused Props property."
+  line: 6
+  column: 6
+  endLine: 6
+  endColumn: 20
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-input.svelte
new file mode 100644
index 000000000..69c9a24f0
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-check-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { BaseProps } from './shared-types';
+	interface Props extends BaseProps {
+		age: number;
+	}
+	let { age }: Props = $props();
+	console.log(age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-errors.yaml
new file mode 100644
index 000000000..d4dfbf838
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'role' is an unused Props property."
+  line: 6
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-input.svelte
new file mode 100644
index 000000000..90aa495dc
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/imported-type-unused-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { ExtendedProps } from './shared-types';
+	interface Props extends ExtendedProps {
+		role: string;
+	}
+	let { name, age }: Props = $props();
+	console.log(name, age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-errors.yaml
new file mode 100644
index 000000000..03b89a8e2
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-errors.yaml
@@ -0,0 +1,9 @@
+- message: "'role' is an unused Props property."
+  line: 8
+  column: 6
+  suggestions: null
+- message: Index signature is unused. Consider using rest operator (...) to
+    capture remaining properties.
+  line: 8
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-input.svelte
new file mode 100644
index 000000000..77a1f17ca
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/index-signature-no-rest-input.svelte
@@ -0,0 +1,10 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+		role: string;
+		[key: string]: string | number;
+	}
+	let { name, age }: Props = $props();
+	console.log(name, age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-errors.yaml
new file mode 100644
index 000000000..128798acb
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-errors.yaml
@@ -0,0 +1,8 @@
+- message: "'version' is an unused Props property."
+  line: 17
+  column: 8
+  suggestions: null
+- message: "'updatedAt' is an unused Props property."
+  line: 17
+  column: 8
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-input.svelte
new file mode 100644
index 000000000..67c81c9b9
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/intersection-unused-input.svelte
@@ -0,0 +1,19 @@
+<script lang="ts">
+	type WithId = {
+		id: string;
+		version: number;
+	};
+
+	type WithTimestamp = {
+		createdAt: Date;
+		updatedAt: Date;
+	};
+
+	type Props = WithId &
+		WithTimestamp & {
+			name: string;
+		};
+
+	const props: Props = $props();
+	console.log(props.id, props.name, props.createdAt);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-errors.yaml
new file mode 100644
index 000000000..3fa480dd7
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-errors.yaml
@@ -0,0 +1,8 @@
+- message: "'email' is an unused Props property."
+  line: 17
+  column: 6
+  suggestions: null
+- message: "'permissions' is an unused Props property."
+  line: 17
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-input.svelte
new file mode 100644
index 000000000..49607ad1c
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/multiple-extends-unused-input.svelte
@@ -0,0 +1,19 @@
+<script lang="ts">
+	interface BaseProps {
+		id: string;
+		type: 'user' | 'admin';
+	}
+
+	interface UserProps extends BaseProps {
+		name: string;
+		email: string;
+	}
+
+	interface Props extends UserProps {
+		role: string;
+		permissions: string[];
+	}
+
+	let props: Props = $props();
+	console.log(props.id, props.type, props.name, props.role);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-errors.yaml
new file mode 100644
index 000000000..4c887b833
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'location' in 'user' is an unused property."
+  line: 8
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-input.svelte
new file mode 100644
index 000000000..8293761a6
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/nested-unused-input.svelte
@@ -0,0 +1,10 @@
+<script lang="ts">
+	interface Props {
+		user: {
+			name: string;
+			location: string;
+		};
+	}
+	let props: Props = $props();
+	console.log(props.user.name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-errors.yaml
new file mode 100644
index 000000000..094710d4b
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-errors.yaml
@@ -0,0 +1,8 @@
+- message: "'optionalCallback' is an unused Props property."
+  line: 9
+  column: 8
+  suggestions: null
+- message: "'optionalData' is an unused Props property."
+  line: 9
+  column: 8
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-input.svelte
new file mode 100644
index 000000000..26af20105
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/optional-unused-input.svelte
@@ -0,0 +1,14 @@
+<script lang="ts">
+	interface Props {
+		required: string;
+		optional?: number;
+		optionalCallback?: () => void;
+		optionalData?: { value: string };
+	}
+
+	const props: Props = $props();
+	console.log(props.required);
+	if (props.optional !== undefined) {
+		console.log(props.optional);
+	}
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-errors.yaml
new file mode 100644
index 000000000..691538c7e
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'id' is an unused Props property."
+  line: 11
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-input.svelte
new file mode 100644
index 000000000..be10ed219
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/parent-interface-unused-input.svelte
@@ -0,0 +1,13 @@
+<script lang="ts">
+	interface BaseProps {
+		id: string;
+		type: 'user' | 'admin';
+	}
+
+	interface Props extends BaseProps {
+		name: string;
+	}
+
+	let { name, type }: Props = $props();
+	console.log(name, type);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/shared-types.ts b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/shared-types.ts
new file mode 100644
index 000000000..a60e61ef1
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/shared-types.ts
@@ -0,0 +1,3 @@
+export interface BaseProps {
+	name: string;
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-errors.yaml
new file mode 100644
index 000000000..e555f296c
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-errors.yaml
@@ -0,0 +1,4 @@
+- message: "'age' is an unused Props property."
+  line: 6
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-input.svelte
new file mode 100644
index 000000000..17d2e8ae9
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/simple-unused-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+	}
+	let { name }: Props = $props();
+	console.log(name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-errors.yaml b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-errors.yaml
new file mode 100644
index 000000000..b8ee310b0
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-errors.yaml
@@ -0,0 +1,5 @@
+- message: Index signature is unused. Consider using rest operator (...) to
+    capture remaining properties.
+  line: 7
+  column: 6
+  suggestions: null
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-input.svelte
new file mode 100644
index 000000000..8861e91e8
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/invalid/unused-index-signature-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	interface Props {
+		a: number;
+		[key: string]: unknown;
+	}
+
+	let { a }: Props = $props();
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/_requirements.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/_requirements.json
new file mode 100644
index 000000000..0192b1098
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/_requirements.json
@@ -0,0 +1,3 @@
+{
+	"svelte": ">=5.0.0-0"
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/any-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/any-input.svelte
new file mode 100644
index 000000000..cc3a654ed
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/any-input.svelte
@@ -0,0 +1,5 @@
+<script lang="ts">
+	// There is no type annotation, so it is treated as any.
+	let props = $props();
+	console.log(props.anything);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/assignment-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/assignment-input.svelte
new file mode 100644
index 000000000..2e3aac0f2
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/assignment-input.svelte
@@ -0,0 +1,4 @@
+<script lang="ts">
+	const props: { value: number } = $props();
+	let localValue = props.value;
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/basic-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/basic-input.svelte
new file mode 100644
index 000000000..1d7029be3
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/basic-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	interface Props {
+		a: string;
+		b: number;
+	}
+	let { a, b }: Props = $props();
+	console.log(a, b);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/builtin-types-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/builtin-types-input.svelte
new file mode 100644
index 000000000..947bf9eaf
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/builtin-types-input.svelte
@@ -0,0 +1,18 @@
+<script lang="ts">
+	type Props = {
+		date: Date;
+		regexp: RegExp;
+		promise: Promise<string>;
+		map: Map<string, number>;
+		set: Set<string>;
+	};
+
+	const props: Props = $props();
+	console.log(
+		props.date.getTime(),
+		props.regexp.test('test'),
+		props.promise.then(console.log),
+		props.map.get('key'),
+		props.set.has('value')
+	);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-member-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-member-input.svelte
new file mode 100644
index 000000000..72b52383d
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-member-input.svelte
@@ -0,0 +1,4 @@
+<script lang="ts">
+	const props: { 'data-value': string } = $props();
+	const value = props['data-value'];
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-property-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-property-input.svelte
new file mode 100644
index 000000000..1e7ad02d5
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/computed-property-input.svelte
@@ -0,0 +1,7 @@
+<script lang="ts">
+	interface Props {
+		dynamic: string;
+	}
+	const props: Props = $props();
+	console.log(props['dynamic']);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/conditional-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/conditional-type-input.svelte
new file mode 100644
index 000000000..d24aa0451
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/conditional-type-input.svelte
@@ -0,0 +1,16 @@
+<script lang="ts">
+	type IsString<T> = T extends string ? true : false;
+	type StringOrNumber<T> = T extends string ? string : number;
+
+	interface Props<T> {
+		value: T;
+		isString: IsString<T>;
+		converted: StringOrNumber<T>;
+	}
+
+	const props: Props<string> = $props();
+	console.log(props.value.length);
+	if (props.isString) {
+		console.log(props.converted.toUpperCase());
+	}
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/extends-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/extends-input.svelte
new file mode 100644
index 000000000..67513d71e
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/extends-input.svelte
@@ -0,0 +1,14 @@
+<script lang="ts">
+	interface BaseProps {
+		id: string;
+		type: 'user' | 'admin';
+	}
+
+	interface Props extends BaseProps {
+		name: string;
+		permissions: string[];
+	}
+
+	let props: Props = $props();
+	console.log(props.id, props.type, props.name, props.permissions);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/function-props-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/function-props-input.svelte
new file mode 100644
index 000000000..6a877eb1f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/function-props-input.svelte
@@ -0,0 +1,12 @@
+<script lang="ts">
+	interface Props {
+		onClick: (event: MouseEvent) => void;
+		transform: <T>(value: T) => string;
+		async: () => Promise<void>;
+	}
+
+	const props: Props = $props();
+	props.onClick(new MouseEvent('click'));
+	const result = props.transform(42);
+	await props.async();
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-config.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-config.json
new file mode 100644
index 000000000..73df77c94
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-config.json
@@ -0,0 +1,7 @@
+{
+	"options": [
+		{
+			"ignorePatterns": ["^Conditional"]
+		}
+	]
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-input.svelte
new file mode 100644
index 000000000..e70238fe6
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/ignored-conditional-type-input.svelte
@@ -0,0 +1,11 @@
+<script lang="ts">
+	interface ConditionalProps {
+		name: string;
+	}
+	interface Props {
+		age: number;
+	}
+	type AllProps = ConditionalProps extends { name: string } ? Props : never;
+	let { age }: AllProps = $props();
+	console.log(age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-config.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-config.json
new file mode 100644
index 000000000..2b42ee30f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-config.json
@@ -0,0 +1,7 @@
+{
+	"options": [
+		{
+			"checkImportedTypes": true
+		}
+	]
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-default-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-default-input.svelte
new file mode 100644
index 000000000..f6527479d
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-default-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { BaseProps } from './shared-types';
+	interface Props extends BaseProps {
+		age: number;
+	}
+	let { name, age }: Props = $props();
+	console.log(name, age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-config.json b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-config.json
new file mode 100644
index 000000000..b67e452ad
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-config.json
@@ -0,0 +1,7 @@
+{
+	"options": [
+		{
+			"checkImportedTypes": false
+		}
+	]
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-input.svelte
new file mode 100644
index 000000000..f6527479d
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-explicit-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { BaseProps } from './shared-types';
+	interface Props extends BaseProps {
+		age: number;
+	}
+	let { name, age }: Props = $props();
+	console.log(name, age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-input.svelte
new file mode 100644
index 000000000..f6527479d
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/imported-type-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { BaseProps } from './shared-types';
+	interface Props extends BaseProps {
+		age: number;
+	}
+	let { name, age }: Props = $props();
+	console.log(name, age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/index-signature-rest-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/index-signature-rest-input.svelte
new file mode 100644
index 000000000..57952541c
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/index-signature-rest-input.svelte
@@ -0,0 +1,9 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+		[key: string]: string | number | boolean;
+	}
+	let { name, age, ...rest }: Props = $props();
+	console.log(name, age, rest.isAdmin, rest.role);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/intersection-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/intersection-type-input.svelte
new file mode 100644
index 000000000..2a3efb25c
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/intersection-type-input.svelte
@@ -0,0 +1,18 @@
+<script lang="ts">
+	type WithId = {
+		id: string;
+	};
+
+	type WithTimestamp = {
+		createdAt: Date;
+		updatedAt: Date;
+	};
+
+	type Props = WithId &
+		WithTimestamp & {
+			name: string;
+		};
+
+	const props: Props = $props();
+	console.log(props.id, props.name, props.createdAt.getTime(), props.updatedAt.getTime());
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-basic-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-basic-input.svelte
new file mode 100644
index 000000000..215fd2a99
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-basic-input.svelte
@@ -0,0 +1,4 @@
+<script>
+	const { a } = $props();
+	console.log(a);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-jsdoc-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-jsdoc-input.svelte
new file mode 100644
index 000000000..63d35ea7d
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-jsdoc-input.svelte
@@ -0,0 +1,10 @@
+<script>
+	/**
+	 * @typedef {Object} Props
+	 * @property {string} name - User name
+	 * @property {number} age - User age
+	 */
+	const props = $props();
+	// JSDoc is not checked, so no warning
+	console.log(props.name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-no-types-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-no-types-input.svelte
new file mode 100644
index 000000000..204dc7729
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/js-no-types-input.svelte
@@ -0,0 +1,4 @@
+<script>
+	const props = $props();
+	console.log(props.anything);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/member-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/member-input.svelte
new file mode 100644
index 000000000..af761c57f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/member-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	interface Props {
+		a: string;
+		b: number;
+	}
+	let props: Props = $props();
+	console.log(props.a, props.b);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/module-script-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/module-script-input.svelte
new file mode 100644
index 000000000..4bf0d56ea
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/module-script-input.svelte
@@ -0,0 +1,11 @@
+<script module lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+	}
+</script>
+
+<script lang="ts">
+	let { name, age }: Props = $props();
+	console.log(name, age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/multiple-index-signatures-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/multiple-index-signatures-input.svelte
new file mode 100644
index 000000000..6c47f2f67
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/multiple-index-signatures-input.svelte
@@ -0,0 +1,10 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+		[key: string]: string | number | boolean;
+		[index: number]: string | number;
+	}
+	let { name, ...rest }: Props = $props();
+	console.log(name);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/nested-props-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/nested-props-input.svelte
new file mode 100644
index 000000000..3e7d799e4
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/nested-props-input.svelte
@@ -0,0 +1,13 @@
+<script lang="ts">
+	interface Props {
+		user: {
+			name: string;
+			profile: {
+				age: number;
+				bio: string;
+			};
+		};
+	}
+	let props: Props = $props();
+	console.log(props.user.name, props.user.profile.age, props.user.profile.bio);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/new-expression-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/new-expression-input.svelte
new file mode 100644
index 000000000..be3441828
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/new-expression-input.svelte
@@ -0,0 +1,4 @@
+<script lang="ts">
+	const props: { config: { new (): any } } = $props();
+	new props.config();
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/optional-props-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/optional-props-input.svelte
new file mode 100644
index 000000000..594560158
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/optional-props-input.svelte
@@ -0,0 +1,14 @@
+<script lang="ts">
+	interface Props {
+		required: string;
+		optional?: number;
+		optionalCallback?: () => void;
+	}
+
+	const props: Props = $props();
+	console.log(props.required);
+	if (props.optional !== undefined) {
+		console.log(props.optional);
+	}
+	props.optionalCallback?.();
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/record-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/record-type-input.svelte
new file mode 100644
index 000000000..13a5e08c6
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/record-type-input.svelte
@@ -0,0 +1,10 @@
+<script lang="ts">
+	type Props = {
+		metadata: Record<string, unknown>;
+		settings: Record<string, boolean>;
+	};
+
+	const props: Props = $props();
+	const value = props.metadata['key'];
+	const enabled = props.settings['feature'];
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/recursive-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/recursive-type-input.svelte
new file mode 100644
index 000000000..f4b66e187
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/recursive-type-input.svelte
@@ -0,0 +1,9 @@
+<script lang="ts">
+	type RecursiveType = {
+		value: string;
+		children?: RecursiveType[];
+	};
+
+	const props: RecursiveType = $props();
+	console.log(props.value, props.children?.[0]?.value);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rename-unused-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rename-unused-input.svelte
new file mode 100644
index 000000000..d8cff60de
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rename-unused-input.svelte
@@ -0,0 +1,10 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+		role: string;
+	}
+	// userRole is unused but it should be reported by @typescript-eslint/no-unused-vars rule.
+	let { name: userName, age: userAge, role: userRole }: Props = $props();
+	console.log(userName, userAge);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-and-index-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-and-index-input.svelte
new file mode 100644
index 000000000..45be43430
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-and-index-input.svelte
@@ -0,0 +1,9 @@
+<script lang="ts">
+	interface Props {
+		a: string;
+		b: number;
+		[key: string]: unknown;
+	}
+	let { a, ...otherProps }: Props = $props();
+	console.log(a, otherProps);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-with-index-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-with-index-input.svelte
new file mode 100644
index 000000000..7583fb925
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/rest-with-index-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		[key: string]: unknown;
+	}
+	let { name, ...rest }: Props = $props();
+	console.log(name, rest);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/shared-types.ts b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/shared-types.ts
new file mode 100644
index 000000000..a60e61ef1
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/shared-types.ts
@@ -0,0 +1,3 @@
+export interface BaseProps {
+	name: string;
+}
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/template-usage-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/template-usage-input.svelte
new file mode 100644
index 000000000..08e3f5a8f
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/template-usage-input.svelte
@@ -0,0 +1,16 @@
+<script lang="ts">
+	interface Props {
+		title: string;
+		description: string;
+		items: string[];
+	}
+	let props: Props = $props();
+</script>
+
+<h1>{props.title}</h1>
+<p>{props.description}</p>
+<ul>
+	{#each props.items as item}
+		<li>{item}</li>
+	{/each}
+</ul>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/typed-props-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/typed-props-input.svelte
new file mode 100644
index 000000000..1957cdc4e
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/typed-props-input.svelte
@@ -0,0 +1,8 @@
+<script lang="ts">
+	interface Props {
+		name: string;
+		age: number;
+	}
+	let props: Props = $props();
+	console.log(props.name, props.age);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/union-type-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/union-type-input.svelte
new file mode 100644
index 000000000..ebf4f4b38
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/union-type-input.svelte
@@ -0,0 +1,11 @@
+<script lang="ts">
+	type Props = {
+		status: 'success' | 'error' | 'loading';
+		data: string | number;
+	};
+
+	const props: Props = $props();
+	if (props.status === 'success') {
+		console.log(props.data);
+	}
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/used-index-signature-input.svelte b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/used-index-signature-input.svelte
new file mode 100644
index 000000000..b69a0ccf6
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/fixtures/rules/no-unused-props/valid/used-index-signature-input.svelte
@@ -0,0 +1,9 @@
+<script lang="ts">
+	interface Props {
+		a: number;
+		[key: string]: unknown;
+	}
+
+	let { a, ...rest }: Props = $props();
+	console.log(rest);
+</script>
diff --git a/packages/eslint-plugin-svelte/tests/src/rules/no-unused-props.ts b/packages/eslint-plugin-svelte/tests/src/rules/no-unused-props.ts
new file mode 100644
index 000000000..104266b8b
--- /dev/null
+++ b/packages/eslint-plugin-svelte/tests/src/rules/no-unused-props.ts
@@ -0,0 +1,12 @@
+import { RuleTester } from '../../utils/eslint-compat.js';
+import rule from '../../../src/rules/no-unused-props.js';
+import { loadTestCases } from '../../utils/utils.js';
+
+const tester = new RuleTester({
+	languageOptions: {
+		ecmaVersion: 2020,
+		sourceType: 'module'
+	}
+});
+
+tester.run('no-unused-props', rule as any, loadTestCases('no-unused-props'));