test: migrate simple-git from jest to vitest

Replace jest + babel-jest with vitest for the simple-git package.

Test infrastructure:
- vitest.config.mts with two projects: 'unit' (mocked child_process via a
  setup file) and 'integration' (real git, longer timeouts). This mirrors the
  old split where only unit specs imported the child_process manual mock.
- Move the global jest.mock() calls (child_process, debug, @kwsites/file-exists)
  into test/unit/__fixtures__/setup.ts, registered via vi.mock with the
  factory inlined to satisfy vi.mock hoisting.
- Convert mock-child-process.ts and fixtures from jest.* to vi.*; jest.Mock
  type -> Mock from vitest across all specs.
- Alias 'simple-git' / 'simple-git/promise' / 'typings' to source; inline
  @simple-git/test-utils so its 'simple-git' import resolves to TS source.

Source entry points:
- Convert src/index.js and src/git.js to TypeScript (.ts). vitest cannot run
  the legacy CommonJS entries that require() sibling .ts files; ESM/TS imports
  are required. git.ts keeps its prototype body verbatim under @ts-nocheck
  (retyped in the task-refactor PR); index.ts keeps export = for the callable
  require('simple-git') CJS shape.
- Point dev 'main' at src/index.ts (publishConfig still overrides to dist).

Package:
- test -> 'vitest run --coverage', test:win -> 'vitest run win32'.
- Drop jest, @types/jest, ts-node, @simple-git/babel-config, and delete
  jest.config.js / babel.config.js. Add vitest + @vitest/coverage-v8.
- test-typescript-consumer keeps using jest (its own migration is separate).

All 787 tests pass (matching the previous jest count) at 94% coverage;
build, build:pkg and all consumer tests remain green.

Author: claude

packages/test-utils/package.json

@@ -2,6 +2,7 @@
   "name": "@simple-git/test-utils",
   "version": "4.0.0",
   "private": true,
+  "main": "index.ts",
   "peerDependencies": {
     "simple-git": "*"
   }

pnpm-lock.yaml

@@ -22,15 +22,13 @@
   },
   "devDependencies": {
     "@kwsites/promise-result": "^1.1.0",
-    "@simple-git/babel-config": "workspace:^",
     "@types/debug": "^4.1.12",
-    "@types/jest": "^29.2.2",
     "@types/node": "^22.15.30",
+    "@vitest/coverage-v8": "^3.0.0",
     "esbuild": "^0.25.0",
     "esbuild-node-externals": "^1.18.0",
-    "jest": "^29.7.0",
-    "ts-node": "^10.9.2",
-    "typescript": "^5"
+    "typescript": "^5",
+    "vitest": "^3.0.0"
   },
   "keywords": [
     "git",
@@ -43,7 +41,7 @@
     "url": "https://github.com/steveukx/git-js.git",
     "directory": "simple-git"
   },
-  "main": "src/index.js",
+  "main": "src/index.ts",
   "module": "dist/esm/index.js",
   "exports": {
     ".": {
@@ -65,8 +63,8 @@
     "build:defs": "tsc -p tsconfig.release.json --outDir dist && cp -r typings dist",
     "build:pkg": "tsx ../devtools/package-json ./simple-git/package.json",
     "prepublishOnly": "pnpm run build:pkg",
-    "test": "jest --coverage",
-    "test:win": "jest '\\.win32.spec.ts$'"
+    "test": "vitest run --coverage",
+    "test:win": "vitest run win32"
   },
   "publish": {
     "main": "dist/cjs/index.js",

simple-git/babel.config.js

@@ -41,7 +41,7 @@ async function cjs() {
    const outfile = resolve(outDir, 'cjs', 'index.js');
 
    await esbuild.build({
-      entryPoints: ['src/index.js'],
+      entryPoints: ['src/index.ts'],
       bundle: true,
       platform: 'node',
       format: 'cjs',

simple-git/jest.config.js

@@ -1,9 +1,10 @@
-const { GitExecutor } = require('./lib/runners/git-executor');
-const { SimpleGitApi } = require('./lib/simple-git-api');
+// @ts-nocheck — legacy prototype-style implementation, retyped in the task-refactor PR.
+import { GitExecutor } from './lib/runners/git-executor';
+import { SimpleGitApi } from './lib/simple-git-api';
 
-const { Scheduler } = require('./lib/runners/scheduler');
-const { adhocExecTask, configurationErrorTask } = require('./lib/tasks/task');
-const {
+import { Scheduler } from './lib/runners/scheduler';
+import { adhocExecTask, configurationErrorTask } from './lib/tasks/task';
+import {
    asArray,
    filterArray,
    filterPrimitives,
@@ -13,39 +14,39 @@ const {
    getTrailingOptions,
    trailingFunctionArgument,
    trailingOptionsArgument,
-} = require('./lib/utils');
-const { applyPatchTask } = require('./lib/tasks/apply-patch');
-const {
+} from './lib/utils';
+import { applyPatchTask } from './lib/tasks/apply-patch';
+import {
    branchTask,
    branchLocalTask,
    deleteBranchesTask,
    deleteBranchTask,
-} = require('./lib/tasks/branch');
-const { checkIgnoreTask } = require('./lib/tasks/check-ignore');
-const { checkIsRepoTask } = require('./lib/tasks/check-is-repo');
-const { cleanWithOptionsTask, isCleanOptionsArray } = require('./lib/tasks/clean');
-const { diffSummaryTask } = require('./lib/tasks/diff');
-const { fetchTask } = require('./lib/tasks/fetch');
-const { moveTask } = require('./lib/tasks/move');
-const { pullTask } = require('./lib/tasks/pull');
-const { pushTagsTask } = require('./lib/tasks/push');
-const {
+} from './lib/tasks/branch';
+import { checkIgnoreTask } from './lib/tasks/check-ignore';
+import { checkIsRepoTask } from './lib/tasks/check-is-repo';
+import { cleanWithOptionsTask, isCleanOptionsArray } from './lib/tasks/clean';
+import { diffSummaryTask } from './lib/tasks/diff';
+import { fetchTask } from './lib/tasks/fetch';
+import { moveTask } from './lib/tasks/move';
+import { pullTask } from './lib/tasks/pull';
+import { pushTagsTask } from './lib/tasks/push';
+import {
    addRemoteTask,
    getRemotesTask,
    listRemotesTask,
    remoteTask,
    removeRemoteTask,
-} = require('./lib/tasks/remote');
-const { getResetMode, resetTask } = require('./lib/tasks/reset');
-const { stashListTask } = require('./lib/tasks/stash-list');
-const {
+} from './lib/tasks/remote';
+import { getResetMode, resetTask } from './lib/tasks/reset';
+import { stashListTask } from './lib/tasks/stash-list';
+import {
    addSubModuleTask,
    initSubModuleTask,
    subModuleTask,
    updateSubModuleTask,
-} = require('./lib/tasks/sub-module');
-const { addAnnotatedTagTask, addTagTask, tagListTask } = require('./lib/tasks/tag');
-const { straightThroughBufferTask, straightThroughStringTask } = require('./lib/tasks/task');
+} from './lib/tasks/sub-module';
+import { addAnnotatedTagTask, addTagTask, tagListTask } from './lib/tasks/tag';
+import { straightThroughBufferTask, straightThroughStringTask } from './lib/tasks/task';
 
 function Git(options, plugins) {
    this._plugins = plugins;
@@ -596,4 +597,9 @@ Git.prototype.checkIsRepo = function (checkType, then) {
    );
 };
 
-module.exports = Git;
+const GitConstructor = Git as unknown as new (
+   options: SimpleGitOptions,
+   plugins: PluginStore
+) => SimpleGit;
+
+export default GitConstructor;

simple-git/package.json

@@ -0,0 +1,6 @@
+import { esModuleFactory, gitExportFactory, gitInstanceFactory } from './lib/git-factory';
+import { gitP } from './lib/runners/promise-wrapped';
+
+const simpleGit = esModuleFactory(gitExportFactory(gitInstanceFactory));
+
+export = Object.assign(simpleGit, { gitP, simpleGit });

simple-git/scripts/build.js

@@ -18,7 +18,7 @@ import { suffixPathsPlugin } from './plugins/suffix-paths.plugin';
 import { createInstanceConfig, folderExists } from './utils';
 import { SimpleGitOptions } from './types';
 
-const Git = require('../git');
+import Git from '../git';
 
 /**
  * Adds the necessary properties to the supplied object to enable it for use as