fix: correct decorator traversal for AssignmentPattern (#2375)

BREAKING CHANGE: - Removed decorators property from several Nodes that could never semantically have them (FunctionDeclaration, TSEnumDeclaration, and TSInterfaceDeclaration) - Removed AST_NODE_TYPES.Import. This is a minor breaking change as the node type that used this was removed ages ago.
typescript-eslint · Aug 29, 2020 · d738fa4eff0a5c4cfc9b30b1c0502f8d1e78d7b6 · d738fa4
1 parent 9de669f
commit d738fa4eff0a5c4cfc9b30b1c0502f8d1e78d7b6
diff --git a/packages/eslint-plugin/src/rules/no-empty-function.ts b/packages/eslint-plugin/src/rules/no-empty-function.ts
@@ -129,9 +129,7 @@ export default util.createRule<Options, MessageIds>({
     ): boolean {
       if (isAllowedDecoratedFunctions && isBodyEmpty(node)) {
         const decorators =
-          node.type === AST_NODE_TYPES.FunctionDeclaration
-            ? node.decorators
-            : node.parent?.type === AST_NODE_TYPES.MethodDefinition
+          node.parent?.type === AST_NODE_TYPES.MethodDefinition
             ? node.parent.decorators
             : undefined;
         return !!decorators && !!decorators.length;

diff --git a/packages/eslint-plugin/tests/rules/no-empty-function.test.ts b/packages/eslint-plugin/tests/rules/no-empty-function.test.ts
@@ -65,13 +65,6 @@ function foo() {
     },
     {
       code: `
-@decorator()
-function foo() {}
-      `,
-      options: [{ allow: ['decoratedFunctions'] }],
-    },
-    {
-      code: `
 class Foo {
   @decorator()
   foo() {}

diff --git a/packages/eslint-plugin/tests/rules/no-unused-vars.test.ts b/packages/eslint-plugin/tests/rules/no-unused-vars.test.ts
@@ -749,6 +749,16 @@ export interface Event<T> {
         },
       ],
     },
+    // https://github.com/typescript-eslint/typescript-eslint/issues/2369
+    `
+export default function (@Optional() value = []) {
+  return value;
+}
+
+function Optional() {
+  return () => {};
+}
+    `,
   ],
 
   invalid: [

diff --git a/packages/types/package.json b/packages/types/package.json
@@ -30,6 +30,7 @@
   "scripts": {
     "build": "tsc -b tsconfig.build.json",
     "clean": "tsc -b tsconfig.build.json --clean",
+    "postclean": "rimraf dist",
     "format": "prettier --write \"./**/*.{ts,js,json,md}\" --ignore-path ../../.prettierignore",
     "generate:lib": "../../node_modules/.bin/ts-node --files --transpile-only ../scope-manager/tools/generate-lib.ts",
     "lint": "eslint . --ext .js,.ts --ignore-path='../../.eslintignore'",

diff --git a/packages/types/src/ts-estree.ts b/packages/types/src/ts-estree.ts
@@ -948,7 +948,6 @@ export interface ForStatement extends BaseNode {
 export interface FunctionDeclaration extends FunctionDeclarationBase {
   type: AST_NODE_TYPES.FunctionDeclaration;
   body: BlockStatement;
-  decorators?: Decorator[];
 }
 
 export interface FunctionExpression extends FunctionDeclarationBase {
@@ -1343,7 +1342,6 @@ export interface TSEnumDeclaration extends BaseNode {
   const?: boolean;
   declare?: boolean;
   modifiers?: Modifier[];
-  decorators?: Decorator[];
 }
 
 /**
@@ -1428,7 +1426,6 @@ export interface TSInterfaceDeclaration extends BaseNode {
   typeParameters?: TSTypeParameterDeclaration;
   extends?: TSInterfaceHeritage[];
   implements?: TSInterfaceHeritage[];
-  decorators?: Decorator[];
   abstract?: boolean;
   declare?: boolean;
 }

diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
@@ -839,17 +839,6 @@ export class Converter {
           );
         }
 
-        /**
-         * Semantically, decorators are not allowed on function declarations,
-         * but the TypeScript compiler will parse them and produce a valid AST,
-         * so we handle them here too.
-         */
-        if (node.decorators) {
-          (result as any).decorators = node.decorators.map(el =>
-            this.convertChild(el),
-          );
-        }
-
         // check for exports
         return this.fixExports(node, result);
       }
@@ -2516,14 +2505,6 @@ export class Converter {
           }
         }
 
-        /**
-         * Semantically, decorators are not allowed on interface declarations,
-         * but the TypeScript compiler will parse them and produce a valid AST,
-         * so we handle them here too.
-         */
-        if (node.decorators) {
-          result.decorators = node.decorators.map(el => this.convertChild(el));
-        }
         if (hasModifier(SyntaxKind.AbstractKeyword, node)) {
           result.abstract = true;
         }
@@ -2575,14 +2556,6 @@ export class Converter {
         });
         // apply modifiers first...
         this.applyModifiersToResult(result, node.modifiers);
-        /**
-         * Semantically, decorators are not allowed on enum declarations,
-         * but the TypeScript compiler will parse them and produce a valid AST,
-         * so we handle them here too.
-         */
-        if (node.decorators) {
-          result.decorators = node.decorators.map(el => this.convertChild(el));
-        }
         // ...then check for exports
         return this.fixExports(node, result);
       }

diff --git a/...estree/tests/snapshots/typescript/errorRecovery/decorator-on-enum-declaration.src.ts.shot b/...estree/tests/snapshots/typescript/errorRecovery/decorator-on-enum-declaration.src.ts.shot
@@ -4,43 +4,6 @@ exports[`typescript errorRecovery decorator-on-enum-declaration.src 1`] = `
 Object {
   "body": Array [
     Object {
-      "decorators": Array [
-        Object {
-          "expression": Object {
-            "loc": Object {
-              "end": Object {
-                "column": 4,
-                "line": 1,
-              },
-              "start": Object {
-                "column": 1,
-                "line": 1,
-              },
-            },
-            "name": "dec",
-            "range": Array [
-              1,
-              4,
-            ],
-            "type": "Identifier",
-          },
-          "loc": Object {
-            "end": Object {
-              "column": 4,
-              "line": 1,
-            },
-            "start": Object {
-              "column": 0,
-              "line": 1,
-            },
-          },
-          "range": Array [
-            0,
-            4,
-          ],
-          "type": "Decorator",
-        },
-      ],
       "id": Object {
         "loc": Object {
           "end": Object {

diff --git a/...escript-estree/tests/snapshots/typescript/errorRecovery/decorator-on-function.src.ts.shot b/...escript-estree/tests/snapshots/typescript/errorRecovery/decorator-on-function.src.ts.shot
@@ -23,43 +23,6 @@ Object {
         ],
         "type": "BlockStatement",
       },
-      "decorators": Array [
-        Object {
-          "expression": Object {
-            "loc": Object {
-              "end": Object {
-                "column": 4,
-                "line": 1,
-              },
-              "start": Object {
-                "column": 1,
-                "line": 1,
-              },
-            },
-            "name": "dec",
-            "range": Array [
-              1,
-              4,
-            ],
-            "type": "Identifier",
-          },
-          "loc": Object {
-            "end": Object {
-              "column": 4,
-              "line": 1,
-            },
-            "start": Object {
-              "column": 0,
-              "line": 1,
-            },
-          },
-          "range": Array [
-            0,
-            4,
-          ],
-          "type": "Decorator",
-        },
-      ],
       "expression": false,
       "generator": false,
       "id": Object {

diff --git a/...e/tests/snapshots/typescript/errorRecovery/decorator-on-interface-declaration.src.ts.shot b/...e/tests/snapshots/typescript/errorRecovery/decorator-on-interface-declaration.src.ts.shot
@@ -22,62 +22,6 @@ Object {
         ],
         "type": "TSInterfaceBody",
       },
-      "decorators": Array [
-        Object {
-          "expression": Object {
-            "arguments": Array [],
-            "callee": Object {
-              "loc": Object {
-                "end": Object {
-                  "column": 5,
-                  "line": 1,
-                },
-                "start": Object {
-                  "column": 1,
-                  "line": 1,
-                },
-              },
-              "name": "deco",
-              "range": Array [
-                1,
-                5,
-              ],
-              "type": "Identifier",
-            },
-            "loc": Object {
-              "end": Object {
-                "column": 7,
-                "line": 1,
-              },
-              "start": Object {
-                "column": 1,
-                "line": 1,
-              },
-            },
-            "optional": false,
-            "range": Array [
-              1,
-              7,
-            ],
-            "type": "CallExpression",
-          },
-          "loc": Object {
-            "end": Object {
-              "column": 7,
-              "line": 1,
-            },
-            "start": Object {
-              "column": 0,
-              "line": 1,
-            },
-          },
-          "range": Array [
-            0,
-            7,
-          ],
-          "type": "Decorator",
-        },
-      ],
       "id": Object {
         "loc": Object {
           "end": Object {

diff --git a/packages/visitor-keys/package.json b/packages/visitor-keys/package.json
@@ -30,6 +30,7 @@
   "scripts": {
     "build": "tsc -b tsconfig.build.json",
     "clean": "tsc -b tsconfig.build.json --clean",
+    "postclean": "rimraf dist",
     "format": "prettier --write \"./**/*.{ts,js,json,md}\" --ignore-path ../../.prettierignore",
     "lint": "eslint . --ext .js,.ts --ignore-path='../../.eslintignore'",
     "test": "jest --coverage",

diff --git a/packages/visitor-keys/src/visitor-keys.ts b/packages/visitor-keys/src/visitor-keys.ts
@@ -22,6 +22,7 @@ const additionalKeys: AdditionalKeys = {
   // Additional Properties.
   ArrayPattern: ['decorators', 'elements', 'typeAnnotation'],
   ArrowFunctionExpression: ['typeParameters', 'params', 'returnType', 'body'],
+  AssignmentPattern: ['decorators', 'left', 'right', 'typeAnnotation'],
   CallExpression: ['callee', 'typeParameters', 'arguments'],
   ClassDeclaration: [
     'decorators',