fix(misc): nx init should add .nx/cache to gitignore (#19961)

packages/nx/src/command-line/init/implementation/add-nx-to-monorepo.ts

@@ -13,6 +13,7 @@ import {
   initCloud,
   printFinalMessage,
   runInstall,
+  updateGitIgnore,
 } from './utils';
 
 type Options = Pick<InitArgs, 'nxCloud' | 'interactive' | 'cacheable'>;
@@ -88,6 +89,7 @@ export async function addNxToMonorepo(options: Options) {
     scriptOutputs
   );
 
+  updateGitIgnore(repoRoot);
   addDepsToPackageJson(repoRoot);
 
   output.log({ title: '📦 Installing dependencies' });

packages/nx/src/command-line/init/implementation/add-nx-to-nest.ts

@@ -23,6 +23,7 @@ import {
   markRootPackageJsonAsNxProject,
   printFinalMessage,
   runInstall,
+  updateGitIgnore,
 } from './utils';
 import { nxVersion } from '../../../utils/versions';
 
@@ -117,6 +118,7 @@ export async function addNxToNest(options: Options, packageJson: PackageJson) {
 
   const pmc = getPackageManagerCommand();
 
+  updateGitIgnore(repoRoot);
   addDepsToPackageJson(repoRoot);
   addNestPluginToPackageJson(repoRoot);
   markRootPackageJsonAsNxProject(

packages/nx/src/command-line/init/implementation/add-nx-to-npm-repo.ts

@@ -11,6 +11,7 @@ import {
   markRootPackageJsonAsNxProject,
   printFinalMessage,
   runInstall,
+  updateGitIgnore,
 } from './utils';
 
 type Options = Pick<InitArgs, 'nxCloud' | 'interactive' | 'cacheable'>;
@@ -72,6 +73,7 @@ export async function addNxToNpmRepo(options: Options) {
 
   const pmc = getPackageManagerCommand();
 
+  updateGitIgnore(repoRoot);
   addDepsToPackageJson(repoRoot);
   markRootPackageJsonAsNxProject(
     repoRoot,

packages/nx/src/command-line/init/implementation/utils.ts

@@ -17,6 +17,7 @@ import {
 } from '../../../utils/package-manager';
 import { joinPathFragments } from '../../../utils/path';
 import { nxVersion } from '../../../utils/versions';
+import { readFileSync, writeFileSync } from 'fs';
 
 export async function askAboutNxCloud(): Promise<boolean> {
   return await enquirer
@@ -121,6 +122,17 @@ export function addDepsToPackageJson(repoRoot: string) {
   writeJsonFile(path, json);
 }
 
+export function updateGitIgnore(root: string) {
+  const ignorePath = join(root, '.gitignore');
+  try {
+    let contents = readFileSync(ignorePath, 'utf-8');
+    if (!contents.includes('.nx/cache')) {
+      contents = [contents, '', '.nx/cache'].join('\n');
+      writeFileSync(ignorePath, contents, 'utf-8');
+    }
+  } catch {}
+}
+
 export function runInstall(
   repoRoot: string,
   pmc: PackageManagerCommands = getPackageManagerCommand()

packages/nx/src/command-line/init/init.ts

@@ -2,7 +2,6 @@ import { execSync } from 'child_process';
 import { prompt } from 'enquirer';
 import { existsSync } from 'fs';
 import { prerelease } from 'semver';
-import * as parser from 'yargs-parser';
 import { addNxToMonorepo } from './implementation/add-nx-to-monorepo';
 import { addNxToNest } from './implementation/add-nx-to-nest';
 import { addNxToNpmRepo } from './implementation/add-nx-to-npm-repo';