fix(@angular-devkit/build-angular): use istanbul-lib-instrument directly for karma code coverage

The `istanbul-lib-instrument` package provides the required functionality needed
to instrument code for test coverage within the context of the Angular CLI.
Since the build pipeline already contains a customized babel preset, this package
can be integrated directly into the pipeline.
This reduces the number of dependencies required for `@angular-devkit/build-angular`
including the deprecated `inflight` package.

Author: clydin

package.json

@@ -122,7 +122,6 @@
     "ansi-colors": "4.1.3",
     "autoprefixer": "10.4.19",
     "babel-loader": "9.1.3",
-    "babel-plugin-istanbul": "6.1.1",
     "browser-sync": "3.0.2",
     "browserslist": "^4.21.5",
     "buffer": "6.0.3",
@@ -144,6 +143,7 @@
     "https-proxy-agent": "7.0.4",
     "husky": "9.0.11",
     "ini": "4.1.3",
+    "istanbul-lib-instrument": "6.0.2",
     "jasmine": "^5.0.0",
     "jasmine-core": "~5.1.0",
     "jasmine-spec-reporter": "~7.0.0",

packages/angular_devkit/build_angular/BUILD.bazel

@@ -161,7 +161,6 @@ ts_library(
         "@npm//ansi-colors",
         "@npm//autoprefixer",
         "@npm//babel-loader",
-        "@npm//babel-plugin-istanbul",
         "@npm//browserslist",
         "@npm//copy-webpack-plugin",
         "@npm//critters",
@@ -171,6 +170,7 @@ ts_library(
         "@npm//fast-glob",
         "@npm//http-proxy-middleware",
         "@npm//https-proxy-agent",
+        "@npm//istanbul-lib-instrument",
         "@npm//jsonc-parser",
         "@npm//karma",
         "@npm//karma-source-map-support",

packages/angular_devkit/build_angular/package.json

@@ -26,7 +26,6 @@
     "ansi-colors": "4.1.3",
     "autoprefixer": "10.4.19",
     "babel-loader": "9.1.3",
-    "babel-plugin-istanbul": "6.1.1",
     "browserslist": "^4.21.5",
     "copy-webpack-plugin": "12.0.2",
     "critters": "0.0.22",
@@ -35,6 +34,7 @@
     "fast-glob": "3.3.2",
     "http-proxy-middleware": "3.0.0",
     "https-proxy-agent": "7.0.4",
+    "istanbul-lib-instrument": "6.0.2",
     "jsonc-parser": "3.2.1",
     "karma-source-map-support": "1.4.0",
     "less": "4.2.0",

packages/angular_devkit/build_angular/src/tools/babel/plugins/add-code-coverage.ts

@@ -0,0 +1,43 @@
+/**
+ * @license
+ * Copyright Google LLC 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.dev/license
+ */
+
+import { NodePath, PluginObj, types } from '@babel/core';
+import { Visitor, programVisitor } from 'istanbul-lib-instrument';
+import assert from 'node:assert';
+
+/**
+ * A babel plugin factory function for adding istanbul instrumentation.
+ *
+ * @returns A babel plugin object instance.
+ */
+export default function (): PluginObj {
+  const visitors = new WeakMap<NodePath, Visitor>();
+
+  return {
+    visitor: {
+      Program: {
+        enter(path, state) {
+          const visitor = programVisitor(types, state.filename, {
+            // Babel returns a Converter object from the `convert-source-map` package
+            inputSourceMap: (state.file.inputMap as undefined | { toObject(): object })?.toObject(),
+          });
+          visitors.set(path, visitor);
+
+          visitor.enter(path);
+        },
+        exit(path) {
+          const visitor = visitors.get(path);
+          assert(visitor, 'Instrumentation visitor should always be present for program path.');
+
+          visitor.exit(path);
+          visitors.delete(path);
+        },
+      },
+    },
+  };
+}

packages/angular_devkit/build_angular/src/tools/babel/plugins/types.d.ts

@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright Google LLC 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.dev/license
+ */
+
+declare module 'istanbul-lib-instrument' {
+  export interface Visitor {
+    enter(path: import('@babel/core').NodePath<types.Program>): void;
+    exit(path: import('@babel/core').NodePath<types.Program>): void;
+  }
+
+  export function programVisitor(
+    types: typeof import('@babel/core').types,
+    filePath?: string,
+    options?: { inputSourceMap?: object | null },
+  ): Visitor;
+}

packages/angular_devkit/build_angular/src/tools/babel/presets/application.ts

@@ -265,13 +265,7 @@ export default function (api: unknown, options: ApplicationPresetOptions) {
   }
 
   if (options.instrumentCode) {
-    plugins.push([
-      require('babel-plugin-istanbul').default,
-      {
-        inputSourceMap: options.instrumentCode.inputSourceMap ?? false,
-        cwd: options.instrumentCode.includedBasePath,
-      },
-    ]);
+    plugins.push(require('../plugins/add-code-coverage').default);
   }
 
   if (needRuntimeTransform) {

yarn.lock

@@ -84,7 +84,6 @@ __metadata:
     ansi-colors: "npm:4.1.3"
     autoprefixer: "npm:10.4.19"
     babel-loader: "npm:9.1.3"
-    babel-plugin-istanbul: "npm:6.1.1"
     browserslist: "npm:^4.21.5"
     copy-webpack-plugin: "npm:12.0.2"
     critters: "npm:0.0.22"
@@ -94,6 +93,7 @@ __metadata:
     fast-glob: "npm:3.3.2"
     http-proxy-middleware: "npm:3.0.0"
     https-proxy-agent: "npm:7.0.4"
+    istanbul-lib-instrument: "npm:6.0.2"
     jsonc-parser: "npm:3.2.1"
     karma-source-map-support: "npm:1.4.0"
     less: "npm:4.2.0"
@@ -689,7 +689,6 @@ __metadata:
     ansi-colors: "npm:4.1.3"
     autoprefixer: "npm:10.4.19"
     babel-loader: "npm:9.1.3"
-    babel-plugin-istanbul: "npm:6.1.1"
     browser-sync: "npm:3.0.2"
     browserslist: "npm:^4.21.5"
     buffer: "npm:6.0.3"
@@ -711,6 +710,7 @@ __metadata:
     https-proxy-agent: "npm:7.0.4"
     husky: "npm:9.0.11"
     ini: "npm:4.1.3"
+    istanbul-lib-instrument: "npm:6.0.2"
     jasmine: "npm:^5.0.0"
     jasmine-core: "npm:~5.1.0"
     jasmine-spec-reporter: "npm:~7.0.0"
@@ -1019,7 +1019,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/core@npm:7.24.7, @babel/core@npm:^7.12.3, @babel/core@npm:^7.16.0":
+"@babel/core@npm:7.24.7, @babel/core@npm:^7.12.3, @babel/core@npm:^7.16.0, @babel/core@npm:^7.23.9":
   version: 7.24.7
   resolution: "@babel/core@npm:7.24.7"
   dependencies:
@@ -1322,7 +1322,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/parser@npm:^7.1.0, @babel/parser@npm:^7.14.7, @babel/parser@npm:^7.20.7, @babel/parser@npm:^7.24.7":
+"@babel/parser@npm:^7.1.0, @babel/parser@npm:^7.14.7, @babel/parser@npm:^7.20.7, @babel/parser@npm:^7.23.9, @babel/parser@npm:^7.24.7":
   version: 7.24.7
   resolution: "@babel/parser@npm:7.24.7"
   bin:
@@ -3297,20 +3297,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@istanbuljs/load-nyc-config@npm:^1.0.0":
-  version: 1.1.0
-  resolution: "@istanbuljs/load-nyc-config@npm:1.1.0"
-  dependencies:
-    camelcase: "npm:^5.3.1"
-    find-up: "npm:^4.1.0"
-    get-package-type: "npm:^0.1.0"
-    js-yaml: "npm:^3.13.1"
-    resolve-from: "npm:^5.0.0"
-  checksum: 10c0/dd2a8b094887da5a1a2339543a4933d06db2e63cbbc2e288eb6431bd832065df0c099d091b6a67436e71b7d6bf85f01ce7c15f9253b4cbebcc3b9a496165ba42
-  languageName: node
-  linkType: hard
-
-"@istanbuljs/schema@npm:^0.1.2":
+"@istanbuljs/schema@npm:^0.1.2, @istanbuljs/schema@npm:^0.1.3":
   version: 0.1.3
   resolution: "@istanbuljs/schema@npm:0.1.3"
   checksum: 10c0/61c5286771676c9ca3eb2bd8a7310a9c063fb6e0e9712225c8471c582d157392c88f5353581c8c9adbe0dff98892317d2fdfc56c3499aa42e0194405206a963a
@@ -7237,7 +7224,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"argparse@npm:^1.0.7, argparse@npm:~1.0.9":
+"argparse@npm:^2.0.1":
+  version: 2.0.1
+  resolution: "argparse@npm:2.0.1"
+  checksum: 10c0/c5640c2d89045371c7cedd6a70212a04e360fd34d6edeae32f6952c63949e3525ea77dbec0289d8213a99bbaeab5abfa860b5c12cf88a2e6cf8106e90dd27a7e
+  languageName: node
+  linkType: hard
+
+"argparse@npm:~1.0.9":
   version: 1.0.10
   resolution: "argparse@npm:1.0.10"
   dependencies:
@@ -7246,13 +7240,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"argparse@npm:^2.0.1":
-  version: 2.0.1
-  resolution: "argparse@npm:2.0.1"
-  checksum: 10c0/c5640c2d89045371c7cedd6a70212a04e360fd34d6edeae32f6952c63949e3525ea77dbec0289d8213a99bbaeab5abfa860b5c12cf88a2e6cf8106e90dd27a7e
-  languageName: node
-  linkType: hard
-
 "array-back@npm:^3.0.1, array-back@npm:^3.1.0":
   version: 3.1.0
   resolution: "array-back@npm:3.1.0"
@@ -7537,19 +7524,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"babel-plugin-istanbul@npm:6.1.1":
-  version: 6.1.1
-  resolution: "babel-plugin-istanbul@npm:6.1.1"
-  dependencies:
-    "@babel/helper-plugin-utils": "npm:^7.0.0"
-    "@istanbuljs/load-nyc-config": "npm:^1.0.0"
-    "@istanbuljs/schema": "npm:^0.1.2"
-    istanbul-lib-instrument: "npm:^5.0.4"
-    test-exclude: "npm:^6.0.0"
-  checksum: 10c0/1075657feb705e00fd9463b329921856d3775d9867c5054b449317d39153f8fbcebd3e02ebf00432824e647faff3683a9ca0a941325ef1afe9b3c4dd51b24beb
-  languageName: node
-  linkType: hard
-
 "babel-plugin-polyfill-corejs2@npm:^0.4.10":
   version: 0.4.11
   resolution: "babel-plugin-polyfill-corejs2@npm:0.4.11"
@@ -8054,7 +8028,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"camelcase@npm:^5.0.0, camelcase@npm:^5.3.1":
+"camelcase@npm:^5.0.0":
   version: 5.3.1
   resolution: "camelcase@npm:5.3.1"
   checksum: 10c0/92ff9b443bfe8abb15f2b1513ca182d16126359ad4f955ebc83dc4ddcc4ef3fdd2c078bc223f2673dc223488e75c99b16cc4d056624374b799e6a1555cf61b23
@@ -10084,7 +10058,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"esprima@npm:^4.0.0, esprima@npm:^4.0.1":
+"esprima@npm:^4.0.1":
   version: 4.0.1
   resolution: "esprima@npm:4.0.1"
   bin:
@@ -10795,13 +10769,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"get-package-type@npm:^0.1.0":
-  version: 0.1.0
-  resolution: "get-package-type@npm:0.1.0"
-  checksum: 10c0/e34cdf447fdf1902a1f6d5af737eaadf606d2ee3518287abde8910e04159368c268568174b2e71102b87b26c2020486f126bfca9c4fb1ceb986ff99b52ecd1be
-  languageName: node
-  linkType: hard
-
 "get-stream@npm:^5.1.0":
   version: 5.2.0
   resolution: "get-stream@npm:5.2.0"
@@ -12149,7 +12116,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"istanbul-lib-instrument@npm:^5.0.4, istanbul-lib-instrument@npm:^5.1.0":
+"istanbul-lib-instrument@npm:6.0.2":
+  version: 6.0.2
+  resolution: "istanbul-lib-instrument@npm:6.0.2"
+  dependencies:
+    "@babel/core": "npm:^7.23.9"
+    "@babel/parser": "npm:^7.23.9"
+    "@istanbuljs/schema": "npm:^0.1.3"
+    istanbul-lib-coverage: "npm:^3.2.0"
+    semver: "npm:^7.5.4"
+  checksum: 10c0/405c6ac037bf8c7ee7495980b0cd5544b2c53078c10534d0c9ceeb92a9ea7dcf8510f58ccfce31336458a8fa6ccef27b570bbb602abaa8c1650f5496a807477c
+  languageName: node
+  linkType: hard
+
+"istanbul-lib-instrument@npm:^5.1.0":
   version: 5.2.1
   resolution: "istanbul-lib-instrument@npm:5.2.1"
   dependencies:
@@ -12331,18 +12311,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"js-yaml@npm:^3.13.1":
-  version: 3.14.1
-  resolution: "js-yaml@npm:3.14.1"
-  dependencies:
-    argparse: "npm:^1.0.7"
-    esprima: "npm:^4.0.0"
-  bin:
-    js-yaml: bin/js-yaml.js
-  checksum: 10c0/6746baaaeac312c4db8e75fa22331d9a04cccb7792d126ed8ce6a0bbcfef0cedaddd0c5098fade53db067c09fe00aa1c957674b4765610a8b06a5a189e46433b
-  languageName: node
-  linkType: hard
-
 "jsbn@npm:1.1.0":
   version: 1.1.0
   resolution: "jsbn@npm:1.1.0"
@@ -15933,13 +15901,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"resolve-from@npm:^5.0.0":
-  version: 5.0.0
-  resolution: "resolve-from@npm:5.0.0"
-  checksum: 10c0/b21cb7f1fb746de8107b9febab60095187781137fd803e6a59a76d421444b1531b641bba5857f5dc011974d8a5c635d61cec49e6bd3b7fc20e01f0fafc4efbf2
-  languageName: node
-  linkType: hard
-
 "resolve-path@npm:^1.4.0":
   version: 1.4.0
   resolution: "resolve-path@npm:1.4.0"