feat(angular): introduce an Angular CLI builder

This replaces the one being removed in angular/angular#37190

.bazelignore

@@ -3,3 +3,4 @@ dist
 bazel-out
 e2e/symlinked_node_modules_yarn/node_modules
 e2e/symlinked_node_modules_npm/node_modules/
+packages/angular/node_modules

.github/BUILD.bazel

@@ -7,6 +7,7 @@ generate_codeowners(
     # do not sort
     owners = [
         "//:OWNERS",
+        "//packages/angular:OWNERS",
         "//packages/labs:OWNERS",
         "//packages/rollup:OWNERS",
         "//examples:OWNERS.examples_nestjs",

.github/CODEOWNERS

@@ -2,6 +2,7 @@
 # Don't edit it directly
 
 * @gregmagolan @soldair @alexeagle
+/packages/angular/** @alan-agius4 @alexeagle
 /packages/labs/** @mrmeku @alexeagle
 /packages/rollup/** @jbedard @alexeagle
 /examples/nestjs/** @zachgrayio @zMotivat0r @rayman1104 @siberex @alexeagle

WORKSPACE

@@ -83,6 +83,12 @@ npm_install(
     package_lock_json = "//packages/node-patches:package-lock.json",
 )
 
+npm_install(
+    name = "angular_deps",
+    package_json = "//packages/angular:package.json",
+    package_lock_json = "//packages/angular:package-lock.json",
+)
+
 # Install all Bazel dependencies needed for npm packages that supply Bazel rules
 load("@npm//:install_bazel_dependencies.bzl", "install_bazel_dependencies")
 

commitlint.config.js

@@ -5,6 +5,7 @@ module.exports = {
     'scope-enum': [
       2, 'always',
       [
+        'angular',
         'builtin',
         'create',
         'examples',

packages/angular/BUILD.bazel

@@ -0,0 +1,23 @@
+load("@build_bazel_rules_nodejs//:tools/defaults.bzl", "codeowners", "pkg_npm")
+load("//packages/typescript:index.bzl", "ts_project")
+
+codeowners(
+    teams = ["@alan-agius4"],
+)
+
+ts_project(
+    tsc = "@angular_deps//typescript/bin:tsc",
+    deps = ["@angular_deps//:node_modules"],
+)
+
+pkg_npm(
+    name = "npm_package",
+    srcs = [
+        "README.md",
+        "package.json",
+        "src/builders/builders.json",
+        "src/builders/schema.d.ts",
+        "src/builders/schema.json",
+    ],
+    deps = ["tsconfig"],
+)

packages/angular/README.md

@@ -0,0 +1,29 @@
+# Angular support for Bazel
+
+This package is a replacement for parts of the deprecated @angular/bazel package previously maintained by the Angular team.
+
+Currently, this only provides an Angular CLI Builder, which can execute Bazel when triggered by `ng build`, `ng test`, etc.
+See https://angular.io/guide/cli-builder for more info about Builders.
+
+This builder assumes you have already created Bazel configurations (WORKSPACE and BUILD files).
+There is presently no tooling to generate these automatically that's supported by either Angular team or rules_nodejs maintainers.
+See the `@bazel/create` package for a quickstart to creating a Bazel workspace, or look at examples in rules_nodejs.
+
+To use it, you would just install this package (it doesn't hook into `ng add` because it has no schematics):
+
+```sh
+$ npm install --save-dev @bazel/angular
+```
+
+Then edit your `angular.json` to invoke Bazel. For example, to have `ng build` do `bazel build //:all` you would edit the `architect` block to have:
+
+```json
+"architect": {
+  "build": {
+    "builder": "@bazel/angular:build",
+    "options": {
+    "targetLabel": "//:all",
+    "bazelCommand": "build"
+  }
+}
+```

packages/angular/package.json

@@ -0,0 +1,29 @@
+{
+    "name": "@bazel/angular",
+    "description": "Run Bazel under the Angular CLI",
+    "license": "Apache-2.0",
+    "version": "0.0.0-PLACEHOLDER",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/bazelbuild/rules_nodejs.git",
+        "directory": "packages/angular"
+    },
+    "bugs": {
+        "url": "https://github.com/bazelbuild/rules_nodejs/issues"
+    },
+    "keywords": [
+        "angular",
+        "bazel"
+    ],
+    "builders": "./src/builders/builders.json",
+    "dependencies": {
+        "@bazel/bazelisk": "^1.4.0",
+        "@bazel/ibazel": "^0.13.1",
+        "@angular-devkit/architect": "^0.901.7"
+    },
+    "devDependencies": {
+        "@angular-devkit/core": "^9.1.7",
+        "@types/node": "^14.0.5",
+        "typescript": "^3.9.3"
+    }
+}

packages/angular/src/builders/builders.json

@@ -0,0 +1,9 @@
+{
+  "builders": {
+    "build": {
+      "implementation": "./index",
+      "schema": "./schema.json",
+      "description": "Executes Bazel on a target."
+    }
+  }
+}

packages/angular/src/builders/index.ts

@@ -0,0 +1,37 @@
+import {BuilderContext, BuilderOutput, createBuilder} from '@angular-devkit/architect';
+import {JsonObject} from '@angular-devkit/core';
+import {getNativeBinary as bazeliskBin} from '@bazel/bazelisk/bazelisk';
+import {getNativeBinary as ibazelBin} from '@bazel/ibazel';
+import {spawn} from 'child_process';
+import {Schema} from './schema';
+
+async function _bazelBuilder(
+    options: JsonObject&Schema,
+    context: BuilderContext,
+    ): Promise<BuilderOutput> {
+  const {bazelCommand, targetLabel, watch} = options;
+  const binary = watch ? ibazelBin() : bazeliskBin();
+  if (typeof binary !== 'string') {
+    // this happens if no binary is located for the current platform
+    return {success: false};
+  } else {
+    try {
+      const ps = spawn(binary, [bazelCommand, targetLabel], {stdio: 'inherit'});
+
+      function shutdown() {
+        ps.kill('SIGTERM');
+      }
+
+      process.on('SIGINT', shutdown);
+      process.on('SIGTERM', shutdown);
+      return new Promise(resolve => {
+        ps.on('close', e => resolve({success: e === 0}));
+      });
+    } catch (err) {
+      context.logger.error(err.message);
+      return {success: false};
+    }
+  }
+}
+
+export default createBuilder(_bazelBuilder);

packages/angular/src/builders/schema.d.ts

@@ -0,0 +1,34 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * Options for Bazel Builder
+ */
+export interface Schema {
+  /**
+   * Common commands supported by Bazel.
+   */
+  bazelCommand: BazelCommand;
+  /**
+   * Target to be executed under Bazel.
+   */
+  targetLabel: string;
+  /**
+   * If true, watch the filesystem using ibazel.
+   */
+  watch?: boolean;
+}
+
+/**
+ * Common commands supported by Bazel.
+ */
+export enum BazelCommand {
+  Build = 'build',
+  Run = 'run',
+  Test = 'test',
+}

packages/angular/src/builders/schema.json

@@ -0,0 +1,31 @@
+{
+    "$schema": "http://json-schema.org/schema",
+    "title": "Bazel builder schema",
+    "description": "Options for Bazel Builder",
+    "type": "object",
+    "properties": {
+      "targetLabel": {
+        "type": "string",
+        "description": "Target to be executed under Bazel."
+      },
+      "bazelCommand": {
+        "type": "string",
+        "description": "Common commands supported by Bazel.",
+        "enum": [
+          "run",
+          "build",
+          "test"
+        ]
+      },
+      "watch": {
+        "type": "boolean",
+        "description": "If true, watch the filesystem using ibazel.",
+        "default": false
+      }
+    },
+    "additionalProperties": false,
+    "required": [
+      "targetLabel",
+      "bazelCommand"
+    ]
+  }

packages/angular/tsconfig.json

@@ -0,0 +1,8 @@
+{
+    "compilerOptions": {
+        "strict": true,
+        "target": "ES2018",
+        "module": "CommonJS",
+        "types": ["node"]
+    }
+}

packages/angular/types.d.ts

@@ -0,0 +1,7 @@
+declare module '@bazel/bazelisk/bazelisk' {
+  function getNativeBinary(): Promise<number>|string;
+}
+
+declare module '@bazel/ibazel' {
+  function getNativeBinary(): Promise<number>|string;
+}