typescript-eslint · bradzacher · May 10, 2020 · Nov 30, 2019 · Nov 30, 2019 · Apr 19, 2020
diff --git a/packages/eslint-plugin/src/rules/indent-new-do-not-use/index.ts b/packages/eslint-plugin/src/rules/indent-new-do-not-use/index.ts
@@ -1115,7 +1115,7 @@ export default createRule<Options, MessageIds>({
       'FunctionDeclaration, FunctionExpression'(
         node: TSESTree.FunctionDeclaration | TSESTree.FunctionExpression,
       ) {
-        const closingParen = sourceCode.getTokenBefore(node.body!)!;
+        const closingParen = sourceCode.getTokenBefore(node.body)!;
         const openingParen = sourceCode.getTokenBefore(
           node.params.length ? node.params[0] : closingParen,
         )!;

diff --git a/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts b/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts
@@ -326,7 +326,10 @@ export default util.createRule({
       },
       // object pattern props are checked via assignments
       ':not(ObjectPattern) > Property'(node: TSESTree.Property): void {
-        if (node.value.type === AST_NODE_TYPES.AssignmentPattern) {
+        if (
+          node.value.type === AST_NODE_TYPES.AssignmentPattern ||
+          node.value.type === AST_NODE_TYPES.TSEmptyBodyFunctionExpression
+        ) {
           // handled by other selector
           return;
         }

diff --git a/packages/eslint-plugin/src/util/explicitReturnTypeUtils.ts b/packages/eslint-plugin/src/util/explicitReturnTypeUtils.ts
@@ -62,7 +62,7 @@ function getReporLoc(
       )!.loc.end;
     }
 
-    return sourceCode.getTokenBefore(node.body!)!.loc.end;
+    return sourceCode.getTokenBefore(node.body)!.loc.end;
   }
 
   return {

diff --git a/packages/parser/src/parser.ts b/packages/parser/src/parser.ts
@@ -5,7 +5,6 @@ import {
   ParserServices,
   TSESTreeOptions,
   TSESTree,
-  simpleTraverse,
   visitorKeys,
 } from '@typescript-eslint/typescript-estree';
 import { analyzeScope } from './analyze-scope';
@@ -95,21 +94,6 @@ export function parseForESLint(
   const { ast, services } = parseAndGenerateServices(code, parserOptions);
   ast.sourceType = options.sourceType;
 
-  simpleTraverse(ast, {
-    enter(node) {
-      switch (node.type) {
-        // Function#body cannot be null in ESTree spec.
-        case AST_NODE_TYPES.FunctionExpression:
-          if (!node.body) {
-            // eslint-disable-next-line @typescript-eslint/no-explicit-any
-            node.type = `TSEmptyBody${node.type}` as any;
-          }
-          break;
-        // no default
-      }
-    },
-  });
-
   const scopeManager = analyzeScope(ast, options);
   return { ast, services, scopeManager, visitorKeys };
 }

diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
@@ -18,16 +18,16 @@ import {
   isComputedProperty,
   isESTreeClassMember,
   isOptional,
-  unescapeStringLiteralText,
   TSError,
+  unescapeStringLiteralText,
 } from './node-utils';
+import { ParserWeakMap, ParserWeakMapESTreeToTSNode } from './parser-options';
 import {
   AST_NODE_TYPES,
   TSESTree,
   TSNode,
   TSESTreeToTSNode,
 } from './ts-estree';
-import { ParserWeakMap, ParserWeakMapESTreeToTSNode } from './parser-options';
 
 const SyntaxKind = ts.SyntaxKind;
 
@@ -995,8 +995,12 @@ export class Converter {
       case SyntaxKind.GetAccessor:
       case SyntaxKind.SetAccessor:
       case SyntaxKind.MethodDeclaration: {
-        const method = this.createNode<TSESTree.FunctionExpression>(node, {
-          type: AST_NODE_TYPES.FunctionExpression,
+        const method = this.createNode<
+          TSESTree.TSEmptyBodyFunctionExpression | TSESTree.FunctionExpression
+        >(node, {
+          type: !node.body
+            ? AST_NODE_TYPES.TSEmptyBodyFunctionExpression
+            : AST_NODE_TYPES.FunctionExpression,
           id: null,
           generator: !!node.asteriskToken,
           expression: false, // ESTreeNode as ESTreeNode here
@@ -1105,8 +1109,12 @@ export class Converter {
           (lastModifier && findNextToken(lastModifier, node, this.ast)) ||
           node.getFirstToken()!;
 
-        const constructor = this.createNode<TSESTree.FunctionExpression>(node, {
-          type: AST_NODE_TYPES.FunctionExpression,
+        const constructor = this.createNode<
+          TSESTree.TSEmptyBodyFunctionExpression | TSESTree.FunctionExpression
+        >(node, {
+          type: !node.body
+            ? AST_NODE_TYPES.TSEmptyBodyFunctionExpression
+            : AST_NODE_TYPES.FunctionExpression,
           id: null,
           params: this.convertParameters(node.parameters),
           generator: false,

diff --git a/packages/typescript-estree/src/ts-estree/ts-estree.ts b/packages/typescript-estree/src/ts-estree/ts-estree.ts
@@ -674,7 +674,11 @@ interface MethodDefinitionNonComputedNameBase extends MethodDefinitionBase {
 interface PropertyBase extends BaseNode {
   type: AST_NODE_TYPES.Property;
   key: PropertyName;
-  value: Expression | AssignmentPattern | BindingName;
+  value:
+    | Expression
+    | AssignmentPattern
+    | BindingName
+    | TSEmptyBodyFunctionExpression;
   computed: boolean;
   method: boolean;
   shorthand: boolean;
@@ -927,6 +931,7 @@ export interface FunctionDeclaration extends FunctionDeclarationBase {
 
 export interface FunctionExpression extends FunctionDeclarationBase {
   type: AST_NODE_TYPES.FunctionExpression;
+  body: BlockStatement;
 }
 
 export interface Identifier extends BaseNode {

diff --git a/packages/typescript-estree/tests/lib/__snapshots__/typescript.ts.snap b/packages/typescript-estree/tests/lib/__snapshots__/typescript.ts.snap
@@ -768,7 +768,7 @@ Object {
                   63,
                   66,
                 ],
-                "type": "FunctionExpression",
+                "type": "TSEmptyBodyFunctionExpression",
               },
             },
           ],
@@ -1216,7 +1216,7 @@ Object {
                     },
                   },
                 },
-                "type": "FunctionExpression",
+                "type": "TSEmptyBodyFunctionExpression",
               },
             },
           ],
@@ -2433,7 +2433,7 @@ Object {
                   68,
                   71,
                 ],
-                "type": "FunctionExpression",
+                "type": "TSEmptyBodyFunctionExpression",
               },
             },
           ],
@@ -4034,7 +4034,7 @@ Object {
                     },
                   },
                 },
-                "type": "FunctionExpression",
+                "type": "TSEmptyBodyFunctionExpression",
               },
             },
           ],
@@ -24208,7 +24208,7 @@ Object {
                 18,
                 21,
               ],
-              "type": "FunctionExpression",
+              "type": "TSEmptyBodyFunctionExpression",
             },
           },
           Object {
@@ -24304,7 +24304,7 @@ Object {
                   "type": "TSStringKeyword",
                 },
               },
-              "type": "FunctionExpression",
+              "type": "TSEmptyBodyFunctionExpression",
             },
           },
           Object {
@@ -24401,7 +24401,7 @@ Object {
                   "type": "TSStringKeyword",
                 },
               },
-              "type": "FunctionExpression",
+              "type": "TSEmptyBodyFunctionExpression",
             },
           },
         ],
@@ -38261,7 +38261,7 @@ Object {
                   "type": "TSAnyKeyword",
                 },
               },
-              "type": "FunctionExpression",
+              "type": "TSEmptyBodyFunctionExpression",
             },
           },
         ],