diff --git a/.changeset/slimy-donkeys-pump.md b/.changeset/slimy-donkeys-pump.md
new file mode 100644
index 000000000..c516398d2
--- /dev/null
+++ b/.changeset/slimy-donkeys-pump.md
@@ -0,0 +1,5 @@
+---
+"eslint-plugin-svelte": minor
+---
+
+feat: added the `svelte/block-lang` rule
diff --git a/README.md b/README.md
index 4ae387077..2cb25d651 100644
--- a/README.md
+++ b/README.md
@@ -330,6 +330,7 @@ These rules relate to better ways of doing things to help you avoid problems:
 
 | Rule ID | Description |    |
 |:--------|:------------|:---|
+| [svelte/block-lang](https://ota-meshi.github.io/eslint-plugin-svelte/rules/block-lang/) | disallows the use of languages other than those specified in the configuration for the lang attribute of `<script>` and `<style>` blocks. |  |
 | [svelte/button-has-type](https://ota-meshi.github.io/eslint-plugin-svelte/rules/button-has-type/) | disallow usage of button without an explicit type attribute |  |
 | [svelte/no-at-debug-tags](https://ota-meshi.github.io/eslint-plugin-svelte/rules/no-at-debug-tags/) | disallow the use of `{@debug}` | :star: |
 | [svelte/no-reactive-functions](https://ota-meshi.github.io/eslint-plugin-svelte/rules/no-reactive-functions/) | it's not necessary to define functions in reactive statements | :bulb: |
diff --git a/docs/rules.md b/docs/rules.md
index 73b79d5d3..b4543b474 100644
--- a/docs/rules.md
+++ b/docs/rules.md
@@ -49,6 +49,7 @@ These rules relate to better ways of doing things to help you avoid problems:
 
 | Rule ID | Description |    |
 |:--------|:------------|:---|
+| [svelte/block-lang](./rules/block-lang.md) | disallows the use of languages other than those specified in the configuration for the lang attribute of `<script>` and `<style>` blocks. |  |
 | [svelte/button-has-type](./rules/button-has-type.md) | disallow usage of button without an explicit type attribute |  |
 | [svelte/no-at-debug-tags](./rules/no-at-debug-tags.md) | disallow the use of `{@debug}` | :star: |
 | [svelte/no-reactive-functions](./rules/no-reactive-functions.md) | it's not necessary to define functions in reactive statements | :bulb: |
diff --git a/docs/rules/block-lang.md b/docs/rules/block-lang.md
new file mode 100644
index 000000000..57282c7cc
--- /dev/null
+++ b/docs/rules/block-lang.md
@@ -0,0 +1,88 @@
+---
+pageClass: "rule-details"
+sidebarDepth: 0
+title: "svelte/block-lang"
+description: "disallows the use of languages other than those specified in the configuration for the lang attribute of `<script>` and `<style>` blocks."
+since: "v2.18.0"
+---
+
+# svelte/block-lang
+
+> disallows the use of languages other than those specified in the configuration for the lang attribute of `<script>` and `<style>` blocks.
+
+## :book: Rule Details
+
+This rule enforces all svelte components to use the same set of languages for their scripts and styles.
+
+<ESLintCodeBlock>
+
+<!--eslint-skip-->
+
+```svelte
+<!-- ✓ GOOD -->
+<script lang="ts">
+/* eslint svelte/block-lang: {"error", { "script": "ts" }} */
+</script>
+```
+
+</ESLintCodeBlock>
+
+<ESLintCodeBlock>
+
+<!--eslint-skip-->
+
+```svelte
+<!-- ✓ GOOD -->
+<script>
+/* eslint svelte/block-lang: {"error", { "script": ["ts", null], "style": "scss" }} */
+</script>
+
+<style lang="scss">
+
+</style>
+```
+
+</ESLintCodeBlock>
+
+<ESLintCodeBlock>
+
+<!--eslint-skip-->
+
+```svelte
+<!-- ✗ BAD -->
+<script>
+/* eslint svelte/block-lang: {"error", { "script": ["ts"] }} */
+</script>
+```
+
+</ESLintCodeBlock>
+
+## :wrench: Options
+
+```json
+{
+  "svelte/block-lang": [
+    "error",
+    {
+      "enforceScriptPresent": true,
+      "enforceStylePresent": false,
+      "script": ["ts", null], // a list of languages or null to signify no language specified
+      "style": "scss" // same as for script, a single value can be used instead of an array.
+    }
+  ]
+}
+```
+
+- `enforceScriptPresent` ... Whether to enforce the presence of a `<script>` block with one of the given languages. This may be useful as for example TypeScript checks some uses of a component if it is defined as being TypeScript. Default `false`.
+- `enforceStylePresent` ... Whether to enforce the presence of a `<style>` block with one of the given languages. Default `false`.
+- `script` ... A list of languages allowed for the `<script>` block. If `null` is included, no `lang` attribute is also allowed. A plain string or `null` can be used instead of one-item array. Default `null`.
+- `style` ... A list of languages allowed for the `<style>` block. If `null` is included, no `lang` attribute is also allowed. A plain string or `null` can be used instead of one-item array. Default `null`.
+
+## :rocket: Version
+
+This rule was introduced in eslint-plugin-svelte v2.18.0
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/ota-meshi/eslint-plugin-svelte/blob/main/src/rules/block-lang.ts)
+- [Test source](https://github.com/ota-meshi/eslint-plugin-svelte/blob/main/tests/src/rules/block-lang.ts)
diff --git a/src/rules/block-lang.ts b/src/rules/block-lang.ts
new file mode 100644
index 000000000..19c50f028
--- /dev/null
+++ b/src/rules/block-lang.ts
@@ -0,0 +1,152 @@
+import { createRule } from "../utils"
+import { getLangValue } from "../utils/ast-utils"
+import type {
+  SvelteScriptElement,
+  SvelteStyleElement,
+} from "svelte-eslint-parser/lib/ast"
+
+export default createRule("block-lang", {
+  meta: {
+    docs: {
+      description:
+        "disallows the use of languages other than those specified in the configuration for the lang attribute of `<script>` and `<style>` blocks.",
+      category: "Best Practices",
+      recommended: false,
+    },
+    schema: [
+      {
+        type: "object",
+        properties: {
+          enforceScriptPresent: {
+            type: "boolean",
+          },
+          enforceStylePresent: {
+            type: "boolean",
+          },
+          script: {
+            oneOf: [
+              {
+                type: ["string", "null"],
+              },
+              {
+                type: "array",
+                items: {
+                  type: ["string", "null"],
+                },
+                minItems: 1,
+              },
+            ],
+          },
+          style: {
+            oneOf: [
+              {
+                type: ["string", "null"],
+              },
+              {
+                type: "array",
+                items: {
+                  type: ["string", "null"],
+                },
+                minItems: 1,
+              },
+            ],
+          },
+        },
+        additionalProperties: false,
+      },
+    ],
+    messages: {},
+    type: "suggestion",
+  },
+  create(context) {
+    const enforceScriptPresent: boolean =
+      context.options[0]?.enforceScriptPresent ?? false
+    const enforceStylePresent: boolean =
+      context.options[0]?.enforceStylePresent ?? false
+
+    const scriptOption: string | null | (string | null)[] =
+      context.options[0]?.script ?? null
+    const allowedScriptLangs: (string | null)[] = Array.isArray(scriptOption)
+      ? scriptOption
+      : [scriptOption]
+    let scriptLang: string | null = null
+    let scriptNode: SvelteScriptElement | undefined = undefined
+
+    const styleOption: string | null | (string | null)[] =
+      context.options[0]?.style ?? null
+    const allowedStyleLangs: (string | null)[] = Array.isArray(styleOption)
+      ? styleOption
+      : [styleOption]
+    let styleLang: string | null = null
+    let styleNode: SvelteStyleElement | undefined = undefined
+
+    return {
+      SvelteScriptElement(node) {
+        scriptNode = node
+        scriptLang = getLangValue(node)?.toLowerCase() ?? null
+      },
+      SvelteStyleElement(node) {
+        styleNode = node
+        styleLang = getLangValue(node)?.toLowerCase() ?? null
+      },
+      "Program:exit"() {
+        if (!allowedScriptLangs.includes(scriptLang)) {
+          if (scriptNode !== undefined) {
+            context.report({
+              node: scriptNode,
+              message: `The lang attribute of the <script> block should be ${prettyPrintLangs(
+                allowedScriptLangs,
+              )}.`,
+            })
+          }
+        }
+        if (scriptNode === undefined && enforceScriptPresent) {
+          context.report({
+            loc: { line: 1, column: 1 },
+            message: `The <script> block should be present and its lang attribute should be ${prettyPrintLangs(
+              allowedScriptLangs,
+            )}.`,
+          })
+        }
+        if (!allowedStyleLangs.includes(styleLang)) {
+          if (styleNode !== undefined) {
+            context.report({
+              node: styleNode,
+              message: `The lang attribute of the <style> block should be ${prettyPrintLangs(
+                allowedStyleLangs,
+              )}.`,
+            })
+          }
+        }
+        if (styleNode === undefined && enforceStylePresent) {
+          context.report({
+            loc: { line: 1, column: 1 },
+            message: `The <style> block should be present and its lang attribute should be ${prettyPrintLangs(
+              allowedStyleLangs,
+            )}.`,
+          })
+        }
+      },
+    }
+  },
+})
+
+/**
+ * Prints the list of allowed languages, with special handling of the `null` option.
+ */
+function prettyPrintLangs(langs: (string | null)[]): string {
+  const hasNull = langs.includes(null)
+  const nonNullLangs = langs
+    .filter((lang) => lang !== null)
+    .map((lang) => `"${lang}"`)
+  if (nonNullLangs.length === 0) {
+    // No special behaviour for `hasNull`, because that can never happen.
+    return "omitted"
+  }
+  const hasNullText = hasNull ? "either omitted or " : ""
+  const nonNullText =
+    nonNullLangs.length === 1
+      ? nonNullLangs[0]
+      : `one of ${nonNullLangs.join(", ")}`
+  return hasNullText + nonNullText
+}
diff --git a/src/utils/rules.ts b/src/utils/rules.ts
index bc8c4813c..b720d98b7 100644
--- a/src/utils/rules.ts
+++ b/src/utils/rules.ts
@@ -1,5 +1,6 @@
 import type { RuleModule } from "../types"
 import typescriptEslintNoUnnecessaryCondition from "../rules/@typescript-eslint/no-unnecessary-condition"
+import blockLang from "../rules/block-lang"
 import buttonHasType from "../rules/button-has-type"
 import commentDirective from "../rules/comment-directive"
 import derivedHasSameInputsOutputs from "../rules/derived-has-same-inputs-outputs"
@@ -54,6 +55,7 @@ import validPropNamesInKitPages from "../rules/valid-prop-names-in-kit-pages"
 
 export const rules = [
   typescriptEslintNoUnnecessaryCondition,
+  blockLang,
   buttonHasType,
   commentDirective,
   derivedHasSameInputsOutputs,
diff --git a/tests/fixtures/rules/block-lang/invalid/script/enforce/_config.json b/tests/fixtures/rules/block-lang/invalid/script/enforce/_config.json
new file mode 100644
index 000000000..8a49d9a86
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/enforce/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "enforceScriptPresent": true }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/enforce/no-script01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/enforce/no-script01-errors.yaml
new file mode 100644
index 000000000..53beb96f8
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/enforce/no-script01-errors.yaml
@@ -0,0 +1,5 @@
+- message: The <script> block should be present and its lang attribute should be
+    omitted.
+  line: 1
+  column: 2
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/enforce/no-script01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/enforce/no-script01-input.svelte
new file mode 100644
index 000000000..31b423045
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/enforce/no-script01-input.svelte
@@ -0,0 +1,3 @@
+<b>Hello World!</b>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/_config.json b/tests/fixtures/rules/block-lang/invalid/script/javascript/_config.json
new file mode 100644
index 000000000..2fa4f7f0e
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["javascript"], "style": ["javascript", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/javascript-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/javascript/javascript-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..f660dd594
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/javascript-as-style-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "javascript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/javascript-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/javascript/javascript-as-style-lang01-input.svelte
new file mode 100644
index 000000000..86a37bd26
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/javascript-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="javascript"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/js01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/javascript/js01-errors.yaml
new file mode 100644
index 000000000..f660dd594
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/js01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "javascript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/js01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/javascript/js01-input.svelte
new file mode 100644
index 000000000..01d0273e5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/js01-input.svelte
@@ -0,0 +1 @@
+<script lang="js"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/javascript/null01-errors.yaml
new file mode 100644
index 000000000..f660dd594
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "javascript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/javascript/null01-input.svelte
new file mode 100644
index 000000000..5d2a3a05b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/null01-input.svelte
@@ -0,0 +1 @@
+<script></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/ts01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/javascript/ts01-errors.yaml
new file mode 100644
index 000000000..f660dd594
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/ts01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "javascript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/ts01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/javascript/ts01-input.svelte
new file mode 100644
index 000000000..5bf03f4a7
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/ts01-input.svelte
@@ -0,0 +1 @@
+<script lang="ts"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/typescript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/javascript/typescript01-errors.yaml
new file mode 100644
index 000000000..f660dd594
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/typescript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "javascript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/javascript/typescript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/javascript/typescript01-input.svelte
new file mode 100644
index 000000000..9aa2d9eee
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/javascript/typescript01-input.svelte
@@ -0,0 +1 @@
+<script lang="typescript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/_config.json b/tests/fixtures/rules/block-lang/invalid/script/js/_config.json
new file mode 100644
index 000000000..5390733e0
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["js"], "style": ["js", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/javascript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/js/javascript01-errors.yaml
new file mode 100644
index 000000000..c49ef5c85
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/javascript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "js".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/javascript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/js/javascript01-input.svelte
new file mode 100644
index 000000000..894251693
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/javascript01-input.svelte
@@ -0,0 +1 @@
+<script lang="javascript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/js-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/js/js-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..c49ef5c85
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/js-as-style-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "js".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/js-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/js/js-as-style-lang01-input.svelte
new file mode 100644
index 000000000..0d4510bdf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/js-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="js"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/js/null01-errors.yaml
new file mode 100644
index 000000000..c49ef5c85
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "js".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/js/null01-input.svelte
new file mode 100644
index 000000000..5d2a3a05b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/null01-input.svelte
@@ -0,0 +1 @@
+<script></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/ts01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/js/ts01-errors.yaml
new file mode 100644
index 000000000..c49ef5c85
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/ts01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "js".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/ts01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/js/ts01-input.svelte
new file mode 100644
index 000000000..5bf03f4a7
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/ts01-input.svelte
@@ -0,0 +1 @@
+<script lang="ts"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/typescript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/js/typescript01-errors.yaml
new file mode 100644
index 000000000..c49ef5c85
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/typescript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "js".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/js/typescript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/js/typescript01-input.svelte
new file mode 100644
index 000000000..9aa2d9eee
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/js/typescript01-input.svelte
@@ -0,0 +1 @@
+<script lang="typescript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/_config.json b/tests/fixtures/rules/block-lang/invalid/script/multiple/_config.json
new file mode 100644
index 000000000..2d369c1af
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/_config.json
@@ -0,0 +1,8 @@
+{
+  "options": [
+    {
+      "script": ["ts", "typescript", null],
+      "style": ["ts", "typescript", null]
+    }
+  ]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/javascript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/multiple/javascript01-errors.yaml
new file mode 100644
index 000000000..90ac8a74e
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/javascript01-errors.yaml
@@ -0,0 +1,5 @@
+- message: The lang attribute of the <script> block should be either omitted or
+    one of "ts", "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/javascript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/multiple/javascript01-input.svelte
new file mode 100644
index 000000000..894251693
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/javascript01-input.svelte
@@ -0,0 +1 @@
+<script lang="javascript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/js01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/multiple/js01-errors.yaml
new file mode 100644
index 000000000..90ac8a74e
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/js01-errors.yaml
@@ -0,0 +1,5 @@
+- message: The lang attribute of the <script> block should be either omitted or
+    one of "ts", "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/js01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/multiple/js01-input.svelte
new file mode 100644
index 000000000..01d0273e5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/js01-input.svelte
@@ -0,0 +1 @@
+<script lang="js"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/null-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/multiple/null-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..90ac8a74e
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/null-as-style-lang01-errors.yaml
@@ -0,0 +1,5 @@
+- message: The lang attribute of the <script> block should be either omitted or
+    one of "ts", "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/null-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/multiple/null-as-style-lang01-input.svelte
new file mode 100644
index 000000000..2c9136f49
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/null-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/ts-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/multiple/ts-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..90ac8a74e
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/ts-as-style-lang01-errors.yaml
@@ -0,0 +1,5 @@
+- message: The lang attribute of the <script> block should be either omitted or
+    one of "ts", "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/ts-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/multiple/ts-as-style-lang01-input.svelte
new file mode 100644
index 000000000..798379e08
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/ts-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style lang="ts"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/typescript-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/multiple/typescript-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..90ac8a74e
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/typescript-as-style-lang01-errors.yaml
@@ -0,0 +1,5 @@
+- message: The lang attribute of the <script> block should be either omitted or
+    one of "ts", "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/multiple/typescript-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/multiple/typescript-as-style-lang01-input.svelte
new file mode 100644
index 000000000..c875e5a94
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/multiple/typescript-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style lang="typescript"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/_config.json b/tests/fixtures/rules/block-lang/invalid/script/null/_config.json
new file mode 100644
index 000000000..8725dee1c
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": [null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/javascript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/null/javascript01-errors.yaml
new file mode 100644
index 000000000..b2d700cdf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/javascript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/javascript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/null/javascript01-input.svelte
new file mode 100644
index 000000000..894251693
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/javascript01-input.svelte
@@ -0,0 +1 @@
+<script lang="javascript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/js01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/null/js01-errors.yaml
new file mode 100644
index 000000000..b2d700cdf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/js01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/js01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/null/js01-input.svelte
new file mode 100644
index 000000000..01d0273e5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/js01-input.svelte
@@ -0,0 +1 @@
+<script lang="js"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/null-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/null/null-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..b2d700cdf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/null-as-style-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/null-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/null/null-as-style-lang01-input.svelte
new file mode 100644
index 000000000..2c9136f49
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/null-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/ts01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/null/ts01-errors.yaml
new file mode 100644
index 000000000..b2d700cdf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/ts01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/ts01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/null/ts01-input.svelte
new file mode 100644
index 000000000..5bf03f4a7
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/ts01-input.svelte
@@ -0,0 +1 @@
+<script lang="ts"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/typescript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/null/typescript01-errors.yaml
new file mode 100644
index 000000000..b2d700cdf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/typescript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/null/typescript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/null/typescript01-input.svelte
new file mode 100644
index 000000000..9aa2d9eee
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/null/typescript01-input.svelte
@@ -0,0 +1 @@
+<script lang="typescript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/_config.json b/tests/fixtures/rules/block-lang/invalid/script/shorthand/_config.json
new file mode 100644
index 000000000..d17bbc3da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": "ts", "style": ["ts", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/javascript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/shorthand/javascript01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/javascript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/javascript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/shorthand/javascript01-input.svelte
new file mode 100644
index 000000000..894251693
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/javascript01-input.svelte
@@ -0,0 +1 @@
+<script lang="javascript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/js01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/shorthand/js01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/js01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/js01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/shorthand/js01-input.svelte
new file mode 100644
index 000000000..01d0273e5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/js01-input.svelte
@@ -0,0 +1 @@
+<script lang="js"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/shorthand/null01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/shorthand/null01-input.svelte
new file mode 100644
index 000000000..5d2a3a05b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/null01-input.svelte
@@ -0,0 +1 @@
+<script></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/ts-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/shorthand/ts-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/ts-as-style-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/ts-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/shorthand/ts-as-style-lang01-input.svelte
new file mode 100644
index 000000000..bf84209e4
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/ts-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="ts"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/typescript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/shorthand/typescript01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/typescript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/shorthand/typescript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/shorthand/typescript01-input.svelte
new file mode 100644
index 000000000..9aa2d9eee
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/shorthand/typescript01-input.svelte
@@ -0,0 +1 @@
+<script lang="typescript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/_config.json b/tests/fixtures/rules/block-lang/invalid/script/ts/_config.json
new file mode 100644
index 000000000..1e4c8d24c
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["ts"], "style": ["ts", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/javascript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/ts/javascript01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/javascript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/javascript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/ts/javascript01-input.svelte
new file mode 100644
index 000000000..894251693
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/javascript01-input.svelte
@@ -0,0 +1 @@
+<script lang="javascript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/js01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/ts/js01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/js01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/js01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/ts/js01-input.svelte
new file mode 100644
index 000000000..01d0273e5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/js01-input.svelte
@@ -0,0 +1 @@
+<script lang="js"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/ts/null01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/ts/null01-input.svelte
new file mode 100644
index 000000000..5d2a3a05b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/null01-input.svelte
@@ -0,0 +1 @@
+<script></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/ts-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/ts/ts-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/ts-as-style-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/ts-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/ts/ts-as-style-lang01-input.svelte
new file mode 100644
index 000000000..bf84209e4
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/ts-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="ts"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/typescript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/ts/typescript01-errors.yaml
new file mode 100644
index 000000000..b42a142cf
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/typescript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "ts".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/ts/typescript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/ts/typescript01-input.svelte
new file mode 100644
index 000000000..9aa2d9eee
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/ts/typescript01-input.svelte
@@ -0,0 +1 @@
+<script lang="typescript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/_config.json b/tests/fixtures/rules/block-lang/invalid/script/typescript/_config.json
new file mode 100644
index 000000000..2c7f534ab
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["typescript"], "style": ["typescript", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/javascript01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/typescript/javascript01-errors.yaml
new file mode 100644
index 000000000..a16e8f39a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/javascript01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/javascript01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/typescript/javascript01-input.svelte
new file mode 100644
index 000000000..894251693
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/javascript01-input.svelte
@@ -0,0 +1 @@
+<script lang="javascript"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/js01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/typescript/js01-errors.yaml
new file mode 100644
index 000000000..a16e8f39a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/js01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/js01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/typescript/js01-input.svelte
new file mode 100644
index 000000000..01d0273e5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/js01-input.svelte
@@ -0,0 +1 @@
+<script lang="js"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/typescript/null01-errors.yaml
new file mode 100644
index 000000000..a16e8f39a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/typescript/null01-input.svelte
new file mode 100644
index 000000000..5d2a3a05b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/null01-input.svelte
@@ -0,0 +1 @@
+<script></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/ts01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/typescript/ts01-errors.yaml
new file mode 100644
index 000000000..a16e8f39a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/ts01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/ts01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/typescript/ts01-input.svelte
new file mode 100644
index 000000000..5bf03f4a7
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/ts01-input.svelte
@@ -0,0 +1 @@
+<script lang="ts"></script>
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/typescript-as-style-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/script/typescript/typescript-as-style-lang01-errors.yaml
new file mode 100644
index 000000000..a16e8f39a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/typescript-as-style-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <script> block should be "typescript".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/script/typescript/typescript-as-style-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/script/typescript/typescript-as-style-lang01-input.svelte
new file mode 100644
index 000000000..df5d7ad73
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/script/typescript/typescript-as-style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="typescript"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/enforce/_config.json b/tests/fixtures/rules/block-lang/invalid/style/enforce/_config.json
new file mode 100644
index 000000000..cee6050d5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/enforce/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "enforceStylePresent": true }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/style/enforce/no-style01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/enforce/no-style01-errors.yaml
new file mode 100644
index 000000000..68033f635
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/enforce/no-style01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The <style> block should be present and its lang attribute should be omitted.
+  line: 1
+  column: 2
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/enforce/no-style01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/enforce/no-style01-input.svelte
new file mode 100644
index 000000000..4abea5f3f
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/enforce/no-style01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/_config.json b/tests/fixtures/rules/block-lang/invalid/style/null/_config.json
new file mode 100644
index 000000000..0e66aa7be
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "style": [null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/null-as-script-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/null/null-as-script-lang01-errors.yaml
new file mode 100644
index 000000000..e476b421b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/null-as-script-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be omitted.
+  line: 3
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/null-as-script-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/null/null-as-script-lang01-input.svelte
new file mode 100644
index 000000000..9c1c647da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/null-as-script-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/sass01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/null/sass01-errors.yaml
new file mode 100644
index 000000000..3685a4a45
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/sass01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/sass01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/null/sass01-input.svelte
new file mode 100644
index 000000000..b608b6e01
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/sass01-input.svelte
@@ -0,0 +1,3 @@
+<style lang="sass">
+
+</style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/scss01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/null/scss01-errors.yaml
new file mode 100644
index 000000000..3685a4a45
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/scss01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be omitted.
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/null/scss01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/null/scss01-input.svelte
new file mode 100644
index 000000000..2551093da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/null/scss01-input.svelte
@@ -0,0 +1 @@
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/_config.json b/tests/fixtures/rules/block-lang/invalid/style/sass/_config.json
new file mode 100644
index 000000000..34b5b4cf6
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["sass", null], "style": ["sass"] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/sass/null01-errors.yaml
new file mode 100644
index 000000000..9eec70357
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be "sass".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/sass/null01-input.svelte
new file mode 100644
index 000000000..6f29e9e9f
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/null01-input.svelte
@@ -0,0 +1 @@
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/sass-as-script-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/sass/sass-as-script-lang01-errors.yaml
new file mode 100644
index 000000000..3cd86cbd2
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/sass-as-script-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be "sass".
+  line: 5
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/sass-as-script-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/sass/sass-as-script-lang01-input.svelte
new file mode 100644
index 000000000..223142014
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/sass-as-script-lang01-input.svelte
@@ -0,0 +1,5 @@
+<script lang="sass">
+
+</script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/scss01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/sass/scss01-errors.yaml
new file mode 100644
index 000000000..9eec70357
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/scss01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be "sass".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/sass/scss01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/sass/scss01-input.svelte
new file mode 100644
index 000000000..2551093da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/sass/scss01-input.svelte
@@ -0,0 +1 @@
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/_config.json b/tests/fixtures/rules/block-lang/invalid/style/scss/_config.json
new file mode 100644
index 000000000..d62a21060
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["scss", null], "style": ["scss"] }]
+}
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/null01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/scss/null01-errors.yaml
new file mode 100644
index 000000000..7663cab19
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/null01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be "scss".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/null01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/scss/null01-input.svelte
new file mode 100644
index 000000000..6f29e9e9f
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/null01-input.svelte
@@ -0,0 +1 @@
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/sass01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/scss/sass01-errors.yaml
new file mode 100644
index 000000000..7663cab19
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/sass01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be "scss".
+  line: 1
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/sass01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/scss/sass01-input.svelte
new file mode 100644
index 000000000..b608b6e01
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/sass01-input.svelte
@@ -0,0 +1,3 @@
+<style lang="sass">
+
+</style>
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/scss-as-script-lang01-errors.yaml b/tests/fixtures/rules/block-lang/invalid/style/scss/scss-as-script-lang01-errors.yaml
new file mode 100644
index 000000000..748d36368
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/scss-as-script-lang01-errors.yaml
@@ -0,0 +1,4 @@
+- message: The lang attribute of the <style> block should be "scss".
+  line: 3
+  column: 1
+  suggestions: null
diff --git a/tests/fixtures/rules/block-lang/invalid/style/scss/scss-as-script-lang01-input.svelte b/tests/fixtures/rules/block-lang/invalid/style/scss/scss-as-script-lang01-input.svelte
new file mode 100644
index 000000000..6d0752741
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/invalid/style/scss/scss-as-script-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="scss"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/enforce/_config.json b/tests/fixtures/rules/block-lang/valid/script/enforce/_config.json
new file mode 100644
index 000000000..8a49d9a86
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/enforce/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "enforceScriptPresent": true }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/enforce/script-present01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/enforce/script-present01-input.svelte
new file mode 100644
index 000000000..5d2a3a05b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/enforce/script-present01-input.svelte
@@ -0,0 +1 @@
+<script></script>
diff --git a/tests/fixtures/rules/block-lang/valid/script/javascript/_config.json b/tests/fixtures/rules/block-lang/valid/script/javascript/_config.json
new file mode 100644
index 000000000..d3821a72b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/javascript/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["javascript"], "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/javascript/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/javascript/correct-lang01-input.svelte
new file mode 100644
index 000000000..9cd8f894c
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/javascript/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="javascript"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/javascript/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/javascript/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/javascript/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/javascript/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/javascript/style-lang01-input.svelte
new file mode 100644
index 000000000..8d0654b10
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/javascript/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="javascript"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/js/_config.json b/tests/fixtures/rules/block-lang/valid/script/js/_config.json
new file mode 100644
index 000000000..a74c6fc72
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/js/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["js"], "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/js/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/js/correct-lang01-input.svelte
new file mode 100644
index 000000000..2c9136f49
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/js/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/js/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/js/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/js/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/js/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/js/style-lang01-input.svelte
new file mode 100644
index 000000000..78191fcf3
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/js/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/multiple/_config.json b/tests/fixtures/rules/block-lang/valid/script/multiple/_config.json
new file mode 100644
index 000000000..8a367b319
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/multiple/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["ts"], "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/multiple/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/multiple/correct-lang01-input.svelte
new file mode 100644
index 000000000..4bcdbdb9b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/multiple/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="ts"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/multiple/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/multiple/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/multiple/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/multiple/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/multiple/style-lang01-input.svelte
new file mode 100644
index 000000000..b995c06ab
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/multiple/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="ts"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/null/_config.json b/tests/fixtures/rules/block-lang/valid/script/null/_config.json
new file mode 100644
index 000000000..14768e256
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/null/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": [null], "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/null/no-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/null/no-lang01-input.svelte
new file mode 100644
index 000000000..fda97fce1
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/null/no-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/null/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/null/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/null/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/null/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/null/style-lang01-input.svelte
new file mode 100644
index 000000000..9c1c647da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/null/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/shorthand/_config.json b/tests/fixtures/rules/block-lang/valid/script/shorthand/_config.json
new file mode 100644
index 000000000..0532deae6
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/shorthand/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": "ts", "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/shorthand/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/shorthand/correct-lang01-input.svelte
new file mode 100644
index 000000000..4bcdbdb9b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/shorthand/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="ts"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/shorthand/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/shorthand/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/shorthand/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/shorthand/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/shorthand/style-lang01-input.svelte
new file mode 100644
index 000000000..b995c06ab
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/shorthand/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="ts"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/_config.json b/tests/fixtures/rules/block-lang/valid/script/ts/_config.json
new file mode 100644
index 000000000..476786668
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["ts", "typescript", null], "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang01-input.svelte
new file mode 100644
index 000000000..4bcdbdb9b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="ts"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang02-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang02-input.svelte
new file mode 100644
index 000000000..091a3f97a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang02-input.svelte
@@ -0,0 +1,3 @@
+<script lang="typescript"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang03-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang03-input.svelte
new file mode 100644
index 000000000..fda97fce1
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/correct-lang03-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/style-lang01-input.svelte
new file mode 100644
index 000000000..b995c06ab
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="ts"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/style-lang02-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/style-lang02-input.svelte
new file mode 100644
index 000000000..ffd69ac3b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/style-lang02-input.svelte
@@ -0,0 +1,3 @@
+<script lang="typescript"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/ts/style-lang03-input.svelte b/tests/fixtures/rules/block-lang/valid/script/ts/style-lang03-input.svelte
new file mode 100644
index 000000000..9c1c647da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/ts/style-lang03-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/typescript/_config.json b/tests/fixtures/rules/block-lang/valid/script/typescript/_config.json
new file mode 100644
index 000000000..f5c283dde
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/typescript/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["typescript"], "style": ["scss", null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/script/typescript/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/typescript/correct-lang01-input.svelte
new file mode 100644
index 000000000..091a3f97a
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/typescript/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="typescript"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/script/typescript/no-script01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/typescript/no-script01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/typescript/no-script01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/script/typescript/style-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/script/typescript/style-lang01-input.svelte
new file mode 100644
index 000000000..ffd69ac3b
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/script/typescript/style-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="typescript"></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/enforce/_config.json b/tests/fixtures/rules/block-lang/valid/style/enforce/_config.json
new file mode 100644
index 000000000..cee6050d5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/enforce/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "enforceStylePresent": true }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/style/enforce/style-present01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/enforce/style-present01-input.svelte
new file mode 100644
index 000000000..6f29e9e9f
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/enforce/style-present01-input.svelte
@@ -0,0 +1 @@
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/null/_config.json b/tests/fixtures/rules/block-lang/valid/style/null/_config.json
new file mode 100644
index 000000000..d59d17654
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/null/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["js", null], "style": [null] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/style/null/no-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/null/no-lang01-input.svelte
new file mode 100644
index 000000000..fda97fce1
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/null/no-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/null/no-style01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/null/no-style01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/null/no-style01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/style/null/script-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/null/script-lang01-input.svelte
new file mode 100644
index 000000000..2c9136f49
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/null/script-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style></style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/sass/_config.json b/tests/fixtures/rules/block-lang/valid/style/sass/_config.json
new file mode 100644
index 000000000..4f1f5a75d
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/sass/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["ts", null], "style": ["sass"] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/style/sass/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/sass/correct-lang01-input.svelte
new file mode 100644
index 000000000..d64de58f5
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/sass/correct-lang01-input.svelte
@@ -0,0 +1,5 @@
+<script></script>
+
+<style lang="sass">
+
+</style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/sass/no-style01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/sass/no-style01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/sass/no-style01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/style/sass/script-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/sass/script-lang01-input.svelte
new file mode 100644
index 000000000..25a97b328
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/sass/script-lang01-input.svelte
@@ -0,0 +1,5 @@
+<script lang="ts"></script>
+
+<style lang="sass">
+
+</style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/scss/_config.json b/tests/fixtures/rules/block-lang/valid/style/scss/_config.json
new file mode 100644
index 000000000..6c2d7f657
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/scss/_config.json
@@ -0,0 +1,3 @@
+{
+  "options": [{ "script": ["js", null], "style": ["scss"] }]
+}
diff --git a/tests/fixtures/rules/block-lang/valid/style/scss/correct-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/scss/correct-lang01-input.svelte
new file mode 100644
index 000000000..9c1c647da
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/scss/correct-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script></script>
+
+<style lang="scss"></style>
diff --git a/tests/fixtures/rules/block-lang/valid/style/scss/no-style01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/scss/no-style01-input.svelte
new file mode 100644
index 000000000..8a73be9fa
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/scss/no-style01-input.svelte
@@ -0,0 +1 @@
+<b>Hello World!</b>
diff --git a/tests/fixtures/rules/block-lang/valid/style/scss/script-lang01-input.svelte b/tests/fixtures/rules/block-lang/valid/style/scss/script-lang01-input.svelte
new file mode 100644
index 000000000..78191fcf3
--- /dev/null
+++ b/tests/fixtures/rules/block-lang/valid/style/scss/script-lang01-input.svelte
@@ -0,0 +1,3 @@
+<script lang="js"></script>
+
+<style lang="scss"></style>
diff --git a/tests/src/rules/block-lang.ts b/tests/src/rules/block-lang.ts
new file mode 100644
index 000000000..4453576e1
--- /dev/null
+++ b/tests/src/rules/block-lang.ts
@@ -0,0 +1,12 @@
+import { RuleTester } from "eslint"
+import rule from "../../../src/rules/block-lang"
+import { loadTestCases } from "../../utils/utils"
+
+const tester = new RuleTester({
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: "module",
+  },
+})
+
+tester.run("block-lang", rule as any, loadTestCases("block-lang"))