build(aio): example-boilerplate is no longer responsible for yarn install (#19511)

The tooling for boilerplate was also running `yarn install` on the examples'
shared folder. But since this is handled by `ng-packages-installer` this
commit refactors the tools so that the boilerplate no longer does this
anymore.

PR Close #19511

aio/package.json

@@ -20,10 +20,10 @@
     "pree2e": "yarn check-env && yarn ~~update-webdriver",
     "e2e": "ng e2e --no-webdriver-update",
     "presetup": "yarn ~~check-env && yarn install && yarn boilerplate:remove",
-    "setup": "yarn aio-use-npm && yarn boilerplate:add",
-    "postsetup": "yarn build-ie-polyfills && yarn generate-plunkers && yarn generate-zips && yarn docs",
+    "setup": "yarn aio-use-npm && yarn example-use-npm",
+    "postsetup": "yarn boilerplate:add && yarn build-ie-polyfills && yarn generate-plunkers && yarn generate-zips && yarn docs",
     "presetup-local": "yarn presetup",
-    "setup-local": "yarn aio-use-local && yarn boilerplate:add --local",
+    "setup-local": "yarn aio-use-local && yarn example-use-local",
     "postsetup-local": "yarn postsetup",
     "pretest-pwa-score-localhost": "yarn build",
     "test-pwa-score-localhost": "concurrently --kill-others --success first \"http-server dist -p 4200 --silent\" \"yarn test-pwa-score http://localhost:4200 90\"",

aio/tools/examples/example-boilerplate.js

@@ -50,18 +50,18 @@ const EXAMPLE_CONFIG_FILENAME = 'example-config.json';
 class ExampleBoilerPlate {
   /**
    * Add boilerplate files to all the examples
-   *
-   * @param useLocal if true then overwrite the Angular library files with locally built ones
    */
-  add(useLocal) {
-    // Install the shared `node_modules/` (if necessary overwrite Angular packages from npm with local ones).
-    this.installNodeModules(SHARED_PATH, useLocal);
-
+  add() {
     // Get all the examples folders, indicated by those that contain a `example-config.json` file
     const exampleFolders = this.getFoldersContaining(EXAMPLES_BASE_PATH, EXAMPLE_CONFIG_FILENAME, 'node_modules');
     exampleFolders.forEach(exampleFolder => {
       const exampleConfig = this.loadJsonFile(path.resolve(exampleFolder, EXAMPLE_CONFIG_FILENAME));
 
+      if (!fs.existsSync(SHARED_NODE_MODULES_PATH)) {
+        throw new Error(`The shared node_modules folder for the examples (${SHARED_NODE_MODULES_PATH}) is missing.\n` +
+        `Perhaps you need to run "yarn example-use-npm" or "yarn example-use-local" to install the dependencies?`);
+      }
+
       // Link the node modules - requires admin access (on Windows) because it adds symlinks
       const destinationNodeModules = path.resolve(exampleFolder, 'node_modules');
       fs.ensureSymlinkSync(SHARED_NODE_MODULES_PATH, destinationNodeModules);
@@ -87,20 +87,12 @@ class ExampleBoilerPlate {
   main() {
     yargs
       .usage('$0 <cmd> [args]')
-      .command('add [--local]', 'add the boilerplate to each example',
-              { local: { describe: 'Use the locally built Angular libraries, rather than ones from  npm.' } },
-              argv => this.add(argv.local))
+      .command('add', 'add the boilerplate to each example', () => this.add())
       .command('remove', 'remove the boilerplate from each example', () => this.remove())
       .demandCommand(1, 'Please supply a command from the list above')
       .argv;
   }
 
-  installNodeModules(basePath, useLocal) {
-    const tool = 'node tools/ng-packages-installer';
-    const command = useLocal ? 'overwrite' : 'restore';
-    shelljs.exec([tool, command, basePath, '--debug'].join(' '));
-  }
-
   getFoldersContaining(basePath, filename, ignore) {
     const pattern = path.resolve(basePath, '**', filename);
     const ignorePattern = path.resolve(basePath, '**', ignore, '**');

aio/tools/examples/example-boilerplate.spec.js

@@ -18,27 +18,12 @@ describe('example-boilerplate tool', () => {
 
     beforeEach(() => {
       spyOn(fs, 'ensureSymlinkSync');
+      spyOn(fs, 'existsSync').and.returnValue(true);
       spyOn(exampleBoilerPlate, 'copyFile');
       spyOn(exampleBoilerPlate, 'getFoldersContaining').and.returnValue(exampleFolders);
-      spyOn(exampleBoilerPlate, 'installNodeModules');
       spyOn(exampleBoilerPlate, 'loadJsonFile').and.returnValue({});
     });
 
-    it('should install the npm dependencies into `sharedDir` (and pass the `useLocal` argument through)', () => {
-      exampleBoilerPlate.add();
-      expect(exampleBoilerPlate.installNodeModules).toHaveBeenCalledWith(sharedDir, undefined);
-
-      exampleBoilerPlate.installNodeModules.calls.reset();
-
-      exampleBoilerPlate.add(true);
-      expect(exampleBoilerPlate.installNodeModules).toHaveBeenCalledWith(sharedDir, true);
-
-      exampleBoilerPlate.installNodeModules.calls.reset();
-
-      exampleBoilerPlate.add(false);
-      expect(exampleBoilerPlate.installNodeModules).toHaveBeenCalledWith(sharedDir, false);
-    });
-
     it('should process all the example folders', () => {
       const examplesDir = path.resolve(__dirname, '../../content/examples');
       exampleBoilerPlate.add();
@@ -53,6 +38,14 @@ describe('example-boilerplate tool', () => {
       expect(fs.ensureSymlinkSync).toHaveBeenCalledWith(sharedNodeModulesDir, path.resolve('c/d/node_modules'));
     });
 
+    it('should error if the node_modules folder is missing', () => {
+      fs.existsSync.and.returnValue(false);
+      expect(() => exampleBoilerPlate.add()).toThrowError(
+        `The shared node_modules folder for the examples (${sharedNodeModulesDir}) is missing.\n` +
+        `Perhaps you need to run "yarn example-use-npm" or "yarn example-use-local" to install the dependencies?`);
+      expect(fs.ensureSymlinkSync).not.toHaveBeenCalled();
+    });
+
     it('should copy all the source boilerplate files for systemjs', () => {
       const boilerplateDir = path.resolve(sharedDir, 'boilerplate');
       exampleBoilerPlate.loadJsonFile.and.callFake(filePath => filePath.indexOf('a/b') !== -1 ? { projectType: 'systemjs' } : {})
@@ -95,28 +88,6 @@ describe('example-boilerplate tool', () => {
     });
   });
 
-  describe('installNodeModules', () => {
-    beforeEach(() => {
-      spyOn(shelljs, 'exec');
-    });
-
-    it('should overwrite the Angular packages if `useLocal` is true', () => {
-      exampleBoilerPlate.installNodeModules('some/base/path', true);
-      expect(shelljs.exec).toHaveBeenCalledWith('node tools/ng-packages-installer overwrite some/base/path --debug');
-      expect(shelljs.exec.calls.count()).toEqual(1);
-    });
-
-    it('should restore the Angular packages if `useLocal` is not true', () => {
-      exampleBoilerPlate.installNodeModules('some/base/path1');
-      expect(shelljs.exec).toHaveBeenCalledWith('node tools/ng-packages-installer restore some/base/path1 --debug');
-
-      exampleBoilerPlate.installNodeModules('some/base/path2', false);
-      expect(shelljs.exec).toHaveBeenCalledWith('node tools/ng-packages-installer restore some/base/path2 --debug');
-
-      expect(shelljs.exec.calls.count()).toEqual(2);
-    });
-  });
-
   describe('getFoldersContaining', () => {
     it('should use glob.sync', () => {
       spyOn(glob, 'sync').and.returnValue(['a/b/config.json', 'c/d/config.json']);

aio/tools/examples/run-example-e2e.js

@@ -4,6 +4,9 @@ const argv = require('yargs').argv;
 const globby = require('globby');
 const xSpawn = require('cross-spawn');
 const treeKill = require('tree-kill');
+const shelljs = require('shelljs');
+
+shelljs.set('-e');
 
 const AIO_PATH = path.join(__dirname, '../../');
 const SHARED_PATH = path.join(__dirname, '/shared');
@@ -42,21 +45,18 @@ const IGNORED_EXAMPLES = [ // temporary ignores
  *    e.g. --shard=1/3 // the second of every three specs: 1, 4, 7, etc
  */
 function runE2e() {
-  let promise = Promise.resolve();
   if (argv.setup) {
     // Run setup.
-    console.log('runE2e: copy boilerplate');
-    const spawnInfo = spawnExt('yarn', ['boilerplate:add', argv.local ? '--local' : ''], { cwd: AIO_PATH });
-    promise = spawnInfo.promise
-      .then(() => {
-        console.log('runE2e: update webdriver');
-        return spawnExt('yarn', ['webdriver:update'], { cwd: SHARED_PATH }).promise;
-      });
+    console.log('runE2e: setup boilerplate');
+    const installPackagesCommand = `example-use-${argv.local ? 'local' : 'npm'}`;
+    const addBoilerplateCommand = 'boilerplate:add';
+    shelljs.exec(`yarn ${installPackagesCommand}`, { cwd: AIO_PATH });
+    shelljs.exec(`yarn ${addBoilerplateCommand}`, { cwd: AIO_PATH });
   }
 
   const outputFile = path.join(AIO_PATH, './protractor-results.txt');
 
-  return promise
+  return Promise.resolve()
     .then(() => findAndRunE2eTests(argv.filter, outputFile, argv.shard))
     .then((status) => {
       reportStatus(status, outputFile);