feat(eslint-plugin): [explicit-function-return-type] add allowedNames

packages/eslint-plugin/docs/rules/explicit-function-return-type.md

@@ -75,6 +75,10 @@ type Options = {
   allowDirectConstAssertionInArrowFunctions?: boolean;
   // if true, concise arrow functions that start with the void keyword will not be checked
   allowConciseArrowFunctionExpressionsStartingWithVoid?: boolean;
+  /**
+   * An array of function/method names that will not have their arguments or their return values checked.
+   */
+  allowedNames?: string[];
 };
 
 const defaults = {
@@ -83,6 +87,7 @@ const defaults = {
   allowHigherOrderFunctions: true,
   allowDirectConstAssertionInArrowFunctions: true,
   allowConciseArrowFunctionExpressionsStartingWithVoid: false,
+  allowedNames: [],
 };
 ```
 
@@ -260,6 +265,21 @@ const log = (message: string) => {
 var log = (message: string) => void console.log(message);
 ```
 
+### `allowedNames`
+
+You may pass function/method names you would like this rule to ignore, like so:
+
+```json
+{
+  "@typescript-eslint/explicit-function-return-type": [
+    "error",
+    {
+      "allowedNames": ["ignoredFunctionName", "ignoredMethodName"]
+    }
+  ]
+}
+```
+
 ## When Not To Use It
 
 If you don't wish to prevent calling code from using function return values in unexpected ways, then

packages/eslint-plugin/src/rules/explicit-function-return-type.ts

@@ -12,6 +12,7 @@ type Options = [
     allowHigherOrderFunctions?: boolean;
     allowDirectConstAssertionInArrowFunctions?: boolean;
     allowConciseArrowFunctionExpressionsStartingWithVoid?: boolean;
+    allowedNames?: string[];
   },
 ];
 type MessageIds = 'missingReturnType';
@@ -47,6 +48,12 @@ export default util.createRule<Options, MessageIds>({
           allowConciseArrowFunctionExpressionsStartingWithVoid: {
             type: 'boolean',
           },
+          allowedNames: {
+            type: 'array',
+            items: {
+              type: 'string',
+            },
+          },
         },
         additionalProperties: false,
       },
@@ -59,11 +66,36 @@ export default util.createRule<Options, MessageIds>({
       allowHigherOrderFunctions: true,
       allowDirectConstAssertionInArrowFunctions: true,
       allowConciseArrowFunctionExpressionsStartingWithVoid: false,
+      allowedNames: [],
     },
   ],
   create(context, [options]) {
     const sourceCode = context.getSourceCode();
-
+    function isAllowedName(
+      node:
+        | TSESTree.ArrowFunctionExpression
+        | TSESTree.FunctionExpression
+        | TSESTree.FunctionDeclaration,
+    ): boolean {
+      if (
+        node.type === AST_NODE_TYPES.ArrowFunctionExpression ||
+        node.type === AST_NODE_TYPES.FunctionExpression
+      ) {
+        const parent = node.parent;
+        return (
+          parent?.type === AST_NODE_TYPES.VariableDeclarator &&
+          parent?.id.type === AST_NODE_TYPES.Identifier &&
+          !!options.allowedNames?.includes(parent.id.name)
+        );
+      }
+      if (node.type === AST_NODE_TYPES.FunctionDeclaration) {
+        return (
+          node.id?.type === AST_NODE_TYPES.Identifier &&
+          !!options.allowedNames?.includes(node.id.name)
+        );
+      }
+      return false;
+    }
     return {
       'ArrowFunctionExpression, FunctionExpression'(
         node: TSESTree.ArrowFunctionExpression | TSESTree.FunctionExpression,
@@ -78,6 +110,10 @@ export default util.createRule<Options, MessageIds>({
           return;
         }
 
+        if (isAllowedName(node)) {
+          return;
+        }
+
         checkFunctionExpressionReturnType(node, options, sourceCode, loc =>
           context.report({
             node,
@@ -87,6 +123,9 @@ export default util.createRule<Options, MessageIds>({
         );
       },
       FunctionDeclaration(node): void {
+        if (isAllowedName(node)) {
+          return;
+        }
         checkFunctionReturnType(node, options, sourceCode, loc =>
           context.report({
             node,

packages/eslint-plugin/tests/rules/explicit-function-return-type.test.ts

@@ -400,6 +400,45 @@ new Foo(1, () => {});
       code: 'const log = (message: string) => void console.log(message);',
       options: [{ allowConciseArrowFunctionExpressionsStartingWithVoid: true }],
     },
+    {
+      filename: 'test.ts',
+      options: [
+        {
+          allowedNames: ['test'],
+        },
+      ],
+      code: `
+function test() {
+  return;
+}
+      `,
+    },
+    {
+      filename: 'test.ts',
+      options: [
+        {
+          allowedNames: ['test'],
+        },
+      ],
+      code: `
+const test = function () {
+  return;
+};
+      `,
+    },
+    {
+      filename: 'test.ts',
+      options: [
+        {
+          allowedNames: ['test'],
+        },
+      ],
+      code: `
+const test = () => {
+  return;
+};
+      `,
+    },
   ],
   invalid: [
     {
@@ -1106,5 +1145,27 @@ const func = (value: number) => ({ type: 'X', value } as const);
         },
       ],
     },
+    {
+      filename: 'test.ts',
+      options: [
+        {
+          allowedNames: ['test'],
+        },
+      ],
+      code: `
+function hoge() {
+  return;
+}
+      `,
+      errors: [
+        {
+          messageId: 'missingReturnType',
+          line: 2,
+          endLine: 2,
+          column: 1,
+          endColumn: 16,
+        },
+      ],
+    },
   ],
 });