I have checked the following piece of code works.

Contents of file quickFixService.ts

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

import { injectable } from 'inversify';
import { CodeActionKind, DocumentFilter, languages } from 'vscode';
import { IExtensionSingleActivationService } from '../../activation/types';
import { QuickFixLaunchJson } from './fixLaunchJson';

@injectable()
export class QuickFixService implements IExtensionSingleActivationService {
    public async activate(): Promise<void> {
        const documentSelector: DocumentFilter = {
            scheme: 'file',
            language: 'jsonc',
            pattern: '**/launch.json'
        };
        languages.registerCodeActionsProvider(documentSelector, new QuickFixLaunchJson(), {
            providedCodeActionKinds: [CodeActionKind.QuickFix]
        });
    }
}

Contents of file fixLaunchJson.ts

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

import { Range } from 'vscode';

/**
 * Provides code actions for launch.json
 */
export class QuickFixLaunchJson implements CodeActionProvider {
    public provideCodeActions(
        document: TextDocument,
        _range: Range | Selection,
        context: CodeActionContext
    ): CodeAction[] {
        // for each diagnostic entry that has the matching `code`, create a code action command
        return context.diagnostics
            .filter(diagnostic => diagnostic.message === 'Incorrect type. Expected "string".')
            .map(diagnostic => this.createFix(document, diagnostic));
    }

    private createFix(document: TextDocument, diagnostic: Diagnostic): CodeAction {
        const finalText = `"${document.getText(diagnostic.range)}"`;
        const fix = new CodeAction(`Convert to ${finalText}`, CodeActionKind.QuickFix);
        fix.edit = new WorkspaceEdit();
        fix.edit.replace(
            document.uri,
            new Range(diagnostic.range.start, diagnostic.range.end),
            finalText
        );
        return fix;
    }
}

The diagnostic message in english is 'Incorrect type. Expected "string"'. We'll need to check messages in other localizations and compare accordingly. The message comes from VSCode.

Show quickfixes for launch.json #10225

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