feat(dev-infra): create common config file loading util (#36091)

Create a common config file loading utility function and the
necessary util directory.  This util directory can provide common
utility functions for usage inside of the dev-infra package.

PR Close #36091

dev-infra/utils/BUILD.bazel

@@ -0,0 +1,17 @@
+load("@npm_bazel_typescript//:index.bzl", "ts_library")
+
+ts_library(
+    name = "config",
+    srcs = [
+        "config.ts",
+    ],
+    visibility = ["//dev-infra:__subpackages__"],
+    deps = [
+        "@npm//@types/json5",
+        "@npm//@types/node",
+        "@npm//@types/shelljs",
+        "@npm//json5",
+        "@npm//shelljs",
+        "@npm//tslib",
+    ],
+)

dev-infra/utils/config.ts

@@ -0,0 +1,45 @@
+/**
+ * @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
+ */
+import {parse} from 'json5';
+import {readFileSync} from 'fs';
+import {join} from 'path';
+import {exec} from 'shelljs';
+
+
+/**
+ * Gets the path of the directory for the repository base.
+ */
+function getRepoBaseDir() {
+  const baseRepoDir = exec(`git rev-parse --show-toplevel`, {silent: true});
+  if (baseRepoDir.code) {
+    throw Error(
+        `Unable to find the path to the base directory of the repository.\n` +
+        `Was the command run from inside of the repo?\n\n` +
+        `ERROR:\n ${baseRepoDir.stderr}`);
+  }
+  return baseRepoDir.trim();
+}
+
+/**
+ * Retrieve the configuration from the .dev-infra.json file.
+ */
+export function getAngularDevConfig(): DevInfraConfig {
+  const configPath = join(getRepoBaseDir(), '.dev-infra.json');
+  let rawConfig = '';
+  try {
+    rawConfig = readFileSync(configPath, 'utf8');
+  } catch {
+    throw Error(
+        `Unable to find config file at:\n` +
+        `  ${configPath}`);
+  }
+  return parse(rawConfig);
+}
+
+// Interface exressing the expected structure of the DevInfraConfig.
+export interface DevInfraConfig {}

package.json

@@ -148,6 +148,7 @@
     "@bazel/buildifier": "^0.29.0",
     "@bazel/ibazel": "^0.12.2",
     "@octokit/graphql": "^4.3.1",
+    "@types/json5": "^0.0.30",
     "@types/minimist": "^1.2.0",
     "@yarnpkg/lockfile": "^1.1.0",
     "browserstacktunnel-wrapper": "2.0.1",
@@ -169,6 +170,7 @@
     "gulp-tslint": "8.1.2",
     "husky": "^0.14.3",
     "jpm": "1.3.1",
+    "json5": "^2.1.2",
     "karma-browserstack-launcher": "^1.3.0",
     "karma-sauce-launcher": "^2.0.2",
     "madge": "^3.6.0",

yarn.lock

@@ -1538,6 +1538,11 @@
   resolved "https://registry.yarnpkg.com/@types/jju/-/jju-1.4.0.tgz#ee074af79540c0e187426f46f12acbe8f6c31232"
   integrity sha512-s6l49zLzFiXYHaTXbA+FNcDRo8ufZgC2/T5/jH+Wfr+ZV2tYbrBpEpN9oPkXXfug+y7pTZFkdeyQ0L/88Z34JA==
 
+"@types/json5@^0.0.30":
+  version "0.0.30"
+  resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.30.tgz#44cb52f32a809734ca562e685c6473b5754a7818"
+  integrity sha512-sqm9g7mHlPY/43fcSNrCYfOeX9zkTTK+euO5E6+CVijSMm5tTjkVdwdqRkY3ljjIAf8679vps5jKUoJBCLsMDA==
+
 "@types/long@^4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@types/long/-/long-4.0.0.tgz#719551d2352d301ac8b81db732acb6bdc28dbdef"
@@ -8689,6 +8694,13 @@ json5@^2.1.0:
   dependencies:
     minimist "^1.2.0"
 
+json5@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.2.tgz#43ef1f0af9835dd624751a6b7fa48874fb2d608e"
+  integrity sha512-MoUOQ4WdiN3yxhm7NEVJSJrieAo5hNSLQ5sj05OTRHPL9HOBy8u4Bu88jsC1jvqAdN+E1bJmsUcZH+1HQxliqQ==
+  dependencies:
+    minimist "^1.2.5"
+
 jsonfile@^2.1.0:
   version "2.4.0"
   resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-2.4.0.tgz#3736a2b428b87bbda0cc83b53fa3d633a35c2ae8"
@@ -10028,6 +10040,11 @@ minimist@1.2.0, minimist@^1.1.0, minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
   integrity sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=
 
+minimist@^1.2.5:
+  version "1.2.5"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
+  integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
+
 minimist@~0.0.1:
   version "0.0.10"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"