Change:
<ins> /*--------------------------------------------------------------------------------------------- *  Copyright (c) Microsoft Corporation. All rights reserved. *  Licensed under the MIT License. See License.txt in the project root for license information. *--------------------------------------------------------------------------------------------*/ import * as assert from 'assert'; import 'mocha'; import * as vscode from 'vscode'; import { MdDefinitionProvider } from '../languageFeatures/definitionProvider'; import { MdLinkProvider } from '../languageFeatures/documentLinkProvider'; import { MdReferencesProvider } from '../languageFeatures/references'; import { githubSlugifier } from '../slugify'; import { InMemoryDocument } from '../util/inMemoryDocument'; import { MdWorkspaceContents } from '../workspaceContents'; import { createNewMarkdownEngine } from './engine'; import { InMemoryWorkspaceMarkdownDocuments } from './inMemoryWorkspace'; import { joinLines, noopToken, workspacePath } from './util'; function getDefinition(doc: InMemoryDocument, pos: vscode.Position, workspaceContents: MdWorkspaceContents) { const engine = createNewMarkdownEngine(); const linkProvider = new MdLinkProvider(engine); const referencesProvider = new MdReferencesProvider(linkProvider, workspaceContents, engine, githubSlugifier); const provider = new MdDefinitionProvider(referencesProvider); return provider.provideDefinition(doc, pos, noopToken); } function assertDefinitionsEqual(actualDef: vscode.Definition, ...expectedDefs: { uri: vscode.Uri; line: number; startCharacter?: number; endCharacter?: number }[]) { const actualDefsArr = Array.isArray(actualDef) ? actualDef : [actualDef]; assert.strictEqual(actualDefsArr.length, expectedDefs.length, `Definition counts should match`); for (let i = 0; i < actualDefsArr.length; ++i) { const actual = actualDefsArr[i]; const expected = expectedDefs[i]; assert.strictEqual(actual.uri.toString(), expected.uri.toString(), `Definition '${i}' has expected document`); assert.strictEqual(actual.range.start.line, expected.line, `Definition '${i}' has expected start line`); assert.strictEqual(actual.range.end.line, expected.line, `Definition '${i}' has expected end line`); if (typeof expected.startCharacter !== 'undefined') { assert.strictEqual(actual.range.start.character, expected.startCharacter, `Definition '${i}' has expected start character`); } if (typeof expected.endCharacter !== 'undefined') { assert.strictEqual(actual.range.end.character, expected.endCharacter, `Definition '${i}' has expected end character`); } } } suite('markdown: Go to definition', () => { test('Should not return definition when on link text', async () => { const doc = new InMemoryDocument(workspacePath('doc.md'), joinLines( `[ref](#abc)`, `[ref]: http://example.com`, )); const defs = await getDefinition(doc, new vscode.Position(0, 1), new InMemoryWorkspaceMarkdownDocuments([doc])); assert.deepStrictEqual(defs, undefined); }); test('Should find definition links within file from link', async () => { const docUri = workspacePath('doc.md'); const doc = new InMemoryDocument(docUri, joinLines( `[link 1][abc]`, // trigger here ``, `[abc]: https://example.com`, )); const defs = await getDefinition(doc, new vscode.Position(0, 12), new InMemoryWorkspaceMarkdownDocuments([doc])); assertDefinitionsEqual(defs!, { uri: docUri, line: 2 }, ); }); test('Should find definition links using shorthand', async () => { const docUri = workspacePath('doc.md'); const doc = new InMemoryDocument(docUri, joinLines( `[ref]`, // trigger 1 ``, `[yes][ref]`, // trigger 2 ``, `[ref]: /Hello.md` // trigger 3 )); { const defs = await getDefinition(doc, new vscode.Position(0, 2), new InMemoryWorkspaceMarkdownDocuments([doc])); assertDefinitionsEqual(defs!, { uri: docUri, line: 4 }, ); } { const defs = await getDefinition(doc, new vscode.Position(2, 7), new InMemoryWorkspaceMarkdownDocuments([doc])); assertDefinitionsEqual(defs!, { uri: docUri, line: 4 }, ); } { const defs = await getDefinition(doc, new vscode.Position(4, 2), new InMemoryWorkspaceMarkdownDocuments([doc])); assertDefinitionsEqual(defs!, { uri: docUri, line: 4 }, ); } }); test('Should find definition links within file from definition', async () => { const docUri = workspacePath('doc.md'); const doc = new InMemoryDocument(docUri, joinLines( `[link 1][abc]`, ``, `[abc]: https://example.com`, // trigger here )); const defs = await getDefinition(doc, new vscode.Position(2, 3), new InMemoryWorkspaceMarkdownDocuments([doc])); assertDefinitionsEqual(defs!, { uri: docUri, line: 2 }, ); }); test('Should not find definition links across files', async () => { const docUri = workspacePath('doc.md'); const doc = new InMemoryDocument(docUri, joinLines( `[link 1][abc]`, ``, `[abc]: https://example.com`, )); const defs = await getDefinition(doc, new vscode.Position(0, 12), new InMemoryWorkspaceMarkdownDocuments([ doc, new InMemoryDocument(workspacePath('other.md'), joinLines( `[link 1][abc]`, ``, `[abc]: https://example.com?bad`, )) ])); assertDefinitionsEqual(defs!, { uri: docUri, line: 2 }, ); }); }); </ins>

Discussion:
Enable triggering go to definition on a markdown reference link to jump to the link definition Go to def should jump to the definition at the end of the file
Related
Created a PR fixing this
Works well, I was a bit confused to see this tooltip with 'Execute command' though, is there a way to make that more context-specific? !