feat(44736): add go-to-definition on overridden members

Author: a-tarasyuk

src/services/goToDefinition.ts

@@ -12,10 +12,14 @@ namespace ts.GoToDefinition {
         if (node === sourceFile) {
             return undefined;
         }
-        const { parent } = node;
 
+        const { parent } = node;
         const typeChecker = program.getTypeChecker();
 
+        if (node.kind === SyntaxKind.OverrideKeyword || node.kind === SyntaxKind.JSDocOverrideTag) {
+            return getDefinitionFromOverriddenMember(typeChecker, node) || emptyArray;
+        }
+
         // Labels
         if (isJumpStatementTarget(node)) {
             const label = getTargetLabel(node.parent, node.text);
@@ -113,6 +117,26 @@ namespace ts.GoToDefinition {
         }
     }
 
+    function getDefinitionFromOverriddenMember(typeChecker: TypeChecker, node: Node) {
+        const classElement = findAncestor(node, isClassElement);
+        if (!(classElement && classElement.name)) return;
+
+        const baseDeclaration = findAncestor(node, isClassLike);
+        if (!baseDeclaration) return;
+
+        const baseTypeNode = getEffectiveBaseTypeNode(baseDeclaration);
+        const baseType = baseTypeNode ? typeChecker.getTypeAtLocation(baseTypeNode) : undefined;
+        if (!baseType) return;
+
+        const name = unescapeLeadingUnderscores(getTextOfPropertyName(classElement.name));
+        const symbol = hasStaticModifier(classElement)
+            ? typeChecker.getPropertyOfType(typeChecker.getTypeOfSymbolAtLocation(baseType.symbol, baseDeclaration), name)
+            : typeChecker.getPropertyOfType(baseType, name);
+        if (!symbol) return;
+
+        return getDefinitionFromSymbol(typeChecker, symbol, node);
+    }
+
     export function getReferenceAtPosition(sourceFile: SourceFile, position: number, program: Program): { reference: FileReference, fileName: string, unverified: boolean, file?: SourceFile } | undefined {
         const referencePath = findReferenceInPosition(sourceFile.referencedFiles, position);
         if (referencePath) {

tests/cases/fourslash/goToDefinitionOverriddenMember1.ts

@@ -0,0 +1,12 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////	/*2*/p = '';
+////}
+////class Bar extends Foo {
+////	[|/*1*/override|] p = '';
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember10.ts

@@ -0,0 +1,15 @@
+/// <reference path="./fourslash.ts"/>
+
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+// @noImplicitOverride: true
+// @filename: a.js
+
+////class Foo {}
+////class Bar extends Foo {
+////    /** [|@override{|"name": "1"|} |]*/
+////    m() {}
+////}
+
+verify.goToDefinition("1", []);

tests/cases/fourslash/goToDefinitionOverriddenMember11.ts

@@ -0,0 +1,17 @@
+/// <reference path="./fourslash.ts"/>
+
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+// @noImplicitOverride: true
+// @filename: a.js
+
+////class Foo {
+////    /*2*/m() {}
+////}
+////class Bar extends Foo {
+////    /** [|@override{|"name": "1"|} |]*/
+////    m() {}
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember12.ts

@@ -0,0 +1,12 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////	static /*2*/p = '';
+////}
+////class Bar extends Foo {
+////	static [|/*1*/override|] p = '';
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember13.ts

@@ -0,0 +1,12 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////	static /*2*/m() {}
+////}
+////class Bar extends Foo {
+////	static [|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember2.ts

@@ -0,0 +1,13 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////	/*2*/m() {}
+////}
+////
+////class Bar extends Foo {
+////	[|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember3.ts

@@ -0,0 +1,13 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////abstract class Foo {
+////	abstract /*2*/m() {}
+////}
+////
+////export class Bar extends Foo {
+////	[|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember4.ts

@@ -0,0 +1,15 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////    /*2*/m() {}
+////}
+////function f () {
+////    return class extends Foo {
+////        [|/*1*/override|] m() {}
+////    }
+////}
+
+verify.goToDefinition("1", "2");
+

tests/cases/fourslash/goToDefinitionOverriddenMember5.ts

@@ -0,0 +1,11 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo extends (class {
+////    /*2*/m() {}
+////}) {
+////    [|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember6.ts

@@ -0,0 +1,12 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////    m() {}
+////}
+////class Bar extends Foo {
+////    [|/*1*/override|] m1() {}
+////}
+
+verify.goToDefinition("1", []);

tests/cases/fourslash/goToDefinitionOverriddenMember7.ts

@@ -0,0 +1,9 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////class Foo {
+////    [|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", []);

tests/cases/fourslash/goToDefinitionOverriddenMember8.ts

@@ -0,0 +1,16 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+// @Filename: ./a.ts
+////export class A {
+////    /*2*/m() {}
+////}
+
+// @Filename: ./b.ts
+////import { A } from "./a";
+////class B extends A {
+////    [|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", "2");

tests/cases/fourslash/goToDefinitionOverriddenMember9.ts

@@ -0,0 +1,15 @@
+/// <reference path="./fourslash.ts"/>
+
+// @noImplicitOverride: true
+
+////interface I {
+////    m(): void;
+////}
+////class A {
+////    /*2*/m() {};
+////}
+////class B extends A implements I {
+////   [|/*1*/override|] m() {}
+////}
+
+verify.goToDefinition("1", "2");