fix: rename variable references within the current scope

Author: 43081j

Diff for: packages/eslint-plugin-svelte/src/rules/derived-has-same-inputs-outputs.ts

@@ -55,7 +55,19 @@ export default createRule('derived-has-same-inputs-outputs', {
 					loc: fnParam.loc,
 					messageId: 'unexpected',
 					data: { name: expectedName },
-					fix: (fixer) => fixer.replaceText(fnParam, expectedName)
+					fix: (fixer) => {
+						const scope = context.getSourceCode().getScope(fn.body);
+						const variable = scope.variables.find((variable) => variable.name === fnParam.name);
+
+						if (!variable) {
+							return fixer.replaceText(fnParam, expectedName);
+						}
+
+						return [
+							fixer.replaceText(fnParam, expectedName),
+							...variable.references.map((ref) => fixer.replaceText(ref.identifier, expectedName))
+						];
+					}
 				});
 			}
 		}

Diff for: packages/eslint-plugin-svelte/src/types.ts

@@ -366,4 +366,6 @@ export interface SourceCode {
 	getCommentsAfter(nodeOrToken: NodeOrToken | AST.Token): AST.Comment[];
 
 	getCommentsInside(node: NodeOrToken): AST.Comment[];
+
+	getScope(node: NodeOrToken): Scope;
 }

Diff for: packages/eslint-plugin-svelte/tests/fixtures/rules/derived-has-same-inputs-outputs/invalid/test01-errors.yaml

@@ -30,3 +30,11 @@
   line: 18
   column: 22
   suggestions: null
+- message: The argument name should be '$a'.
+  line: 21
+  column: 13
+  suggestions: null
+- message: The argument name should be '$a'.
+  line: 28
+  column: 13
+  suggestions: null

Diff for: packages/eslint-plugin-svelte/tests/fixtures/rules/derived-has-same-inputs-outputs/invalid/test01-input.js

@@ -18,3 +18,19 @@ derived([null, l], ([$m, $n]) => {
 derived([o, null], ([$p, $q]) => {
 	/** do nothing */
 });
+derived(a, (b) => {
+	doSomethingWith(b);
+
+	somethingWithACallback(() => {
+		b;
+	});
+});
+derived(a, (b) => {
+	b;
+
+	somethingWithACallback(() => {
+		// purposely shadow the var, this should not be updated
+		const b = 303;
+		b;
+	});
+});

Diff for: packages/eslint-plugin-svelte/tests/fixtures/rules/derived-has-same-inputs-outputs/invalid/test01-output.js

@@ -18,3 +18,19 @@ derived([null, l], ([$m, $l]) => {
 derived([o, null], ([$o, $q]) => {
 	/** do nothing */
 });
+derived(a, ($a) => {
+	doSomethingWith($a);
+
+	somethingWithACallback(() => {
+		$a;
+	});
+});
+derived(a, ($a) => {
+	$a;
+
+	somethingWithACallback(() => {
+		// purposely shadow the var, this should not be updated
+		const b = 303;
+		b;
+	});
+});