fix: deprecate svelte/@typescript-eslint/no-unnecessary-condition rule

.changeset/witty-pumas-greet.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-svelte": minor
+---
+
+fix: deprecate `svelte/@typescript-eslint/no-unnecessary-condition` rule

README.md

@@ -327,7 +327,6 @@ These rules extend the rules provided by ESLint itself, or other plugins to work
 
 | Rule ID | Description |    |
 |:--------|:------------|:---|
-| [svelte/@typescript-eslint/no-unnecessary-condition](https://ota-meshi.github.io/eslint-plugin-svelte/rules/@typescript-eslint/no-unnecessary-condition/) | disallow conditionals where the type is always truthy or always falsy | :wrench: |
 | [svelte/no-inner-declarations](https://ota-meshi.github.io/eslint-plugin-svelte/rules/no-inner-declarations/) | disallow variable or `function` declarations in nested blocks | :star: |
 | [svelte/no-trailing-spaces](https://ota-meshi.github.io/eslint-plugin-svelte/rules/no-trailing-spaces/) | disallow trailing whitespace at the end of lines | :wrench: |
 
@@ -340,6 +339,15 @@ These rules relate to this plugin works:
 | [svelte/comment-directive](https://ota-meshi.github.io/eslint-plugin-svelte/rules/comment-directive/) | support comment-directives in HTML template | :star: |
 | [svelte/system](https://ota-meshi.github.io/eslint-plugin-svelte/rules/system/) | system rule for working this plugin | :star: |
 
+## Deprecated
+
+- :warning: We're going to remove deprecated rules in the next major release. Please migrate to successor/new rules.
+- :innocent: We don't fix bugs which are in deprecated rules since we don't have enough resources.
+
+| Rule ID | Replaced by |
+|:--------|:------------|
+| [svelte/@typescript-eslint/no-unnecessary-condition](https://ota-meshi.github.io/eslint-plugin-svelte/rules/@typescript-eslint/no-unnecessary-condition/) | This rule is no longer needed when using svelte-eslint-parser>=v0.19.0. |
+
 <!--RULES_TABLE_END-->
 <!--RULES_SECTION_END-->
 <!-- prettier-ignore-end -->

docs/rules.md

@@ -80,7 +80,6 @@ These rules extend the rules provided by ESLint itself, or other plugins to work
 
 | Rule ID | Description |    |
 |:--------|:------------|:---|
-| [svelte/@typescript-eslint/no-unnecessary-condition](./rules/@typescript-eslint/no-unnecessary-condition.md) | disallow conditionals where the type is always truthy or always falsy | :wrench: |
 | [svelte/no-inner-declarations](./rules/no-inner-declarations.md) | disallow variable or `function` declarations in nested blocks | :star: |
 | [svelte/no-trailing-spaces](./rules/no-trailing-spaces.md) | disallow trailing whitespace at the end of lines | :wrench: |
 
@@ -92,3 +91,12 @@ These rules relate to this plugin works:
 |:--------|:------------|:---|
 | [svelte/comment-directive](./rules/comment-directive.md) | support comment-directives in HTML template | :star: |
 | [svelte/system](./rules/system.md) | system rule for working this plugin | :star: |
+
+## Deprecated
+
+- :warning: We're going to remove deprecated rules in the next major release. Please migrate to successor/new rules.
+- :innocent: We don't fix bugs which are in deprecated rules since we don't have enough resources.
+
+| Rule ID | Replaced by |
+|:--------|:------------|
+| [svelte/@typescript-eslint/no-unnecessary-condition](./rules/@typescript-eslint/no-unnecessary-condition.md) | This rule is no longer needed when using svelte-eslint-parser>=v0.19.0. |

docs/rules/@typescript-eslint/no-unnecessary-condition.md

@@ -10,10 +10,13 @@ since: "v2.9.0"
 
 > disallow conditionals where the type is always truthy or always falsy
 
+- :warning: This rule was **deprecated**. This rule is no longer needed when using svelte-eslint-parser>=v0.19.0.
 - :wrench: The `--fix` option on the [command line](https://eslint.org/docs/user-guide/command-line-interface#fixing-problems) can automatically fix some of the problems reported by this rule.
 
 ## :book: Rule Details
 
+**This rule is no longer needed when using svelte-eslint-parser>=v0.19.0.**
+
 This rule extends the base `@typescript-eslint`'s [@typescript-eslint/no-unnecessary-condition] rule.
 The [@typescript-eslint/no-unnecessary-condition] rule does not understand reactive or rerendering of Svelte components and has false positives when used with Svelte components. This rule understands reactive and rerendering of Svelte components.
 

src/rules/@typescript-eslint/no-unnecessary-condition.ts

@@ -144,6 +144,10 @@ export default createRule("@typescript-eslint/no-unnecessary-condition", {
         "This rule requires the `strictNullChecks` compiler option to be turned on to function correctly.",
     },
     type: "suggestion", // "problem", or "layout",
+    deprecated: true,
+    replacedBy: {
+      note: "This rule is no longer needed when using svelte-eslint-parser>=v0.19.0.",
+    },
   },
   create(context) {
     const {

src/types.ts

@@ -77,7 +77,7 @@ export interface RuleMetaData {
   hasSuggestions?: boolean
   schema: JSONSchema4 | JSONSchema4[]
   deprecated?: boolean
-  replacedBy?: string[]
+  replacedBy?: string[] | { note: string }
   type: "problem" | "suggestion" | "layout"
 }
 
@@ -112,7 +112,7 @@ export interface PartialRuleMetaData {
   hasSuggestions?: boolean
   schema: JSONSchema4 | JSONSchema4[]
   deprecated?: boolean
-  replacedBy?: string[]
+  replacedBy?: string[] | { note: string }
   type: "problem" | "suggestion" | "layout"
 }
 

tools/render-rules.ts

@@ -68,9 +68,11 @@ export default function renderRulesTableContent(
       rule.meta.docs.ruleName || "",
     )})`
     const replacedRules = rule.meta.replacedBy || []
-    const replacedBy = replacedRules
-      .map((name) => `[svelte/${name}](${buildRulePath(name)})`)
-      .join(", ")
+    const replacedBy = Array.isArray(replacedRules)
+      ? replacedRules
+          .map((name) => `[svelte/${name}](${buildRulePath(name)})`)
+          .join(", ")
+      : replacedRules.note
 
     return `| ${link} | ${replacedBy || "(no replacement)"} |`
   }

tools/update-docs.ts

@@ -80,14 +80,20 @@ class DocFile {
 
     if (deprecated) {
       if (replacedBy) {
-        const replacedRules = replacedBy.map(
-          (name) => `[svelte/${name}](${name}.md) rule`,
-        )
-        notes.push(
-          `- :warning: This rule was **deprecated** and replaced by ${formatItems(
-            replacedRules,
-          )}.`,
-        )
+        if (Array.isArray(replacedBy)) {
+          const replacedRules = replacedBy.map(
+            (name) => `[svelte/${name}](${name}.md) rule`,
+          )
+          notes.push(
+            `- :warning: This rule was **deprecated** and replaced by ${formatItems(
+              replacedRules,
+            )}.`,
+          )
+        } else {
+          notes.push(
+            `- :warning: This rule was **deprecated**. ${replacedBy.note}`,
+          )
+        }
       } else {
         notes.push("- :warning: This rule was **deprecated**.")
       }