build: set up ng-dev toolset for the repo (#1244)

Set up the ng-dev toolset for the repo to allow it to be used for merging PRs.

Author: josephperrott

.gitignore

@@ -9,3 +9,9 @@ dist/
 .vscode/settings.json
 .vimrc
 .nvimrc
+
+
+# Ignore files log and local only files related to ng-dev
+*.log
+.ng-dev.user*
+.husky/_

.ng-dev/config.ts

@@ -0,0 +1,7 @@
+import {github} from './github';
+import {merge} from './merge';
+
+export {
+  github,
+  merge,
+}

.ng-dev/github.ts

@@ -0,0 +1,9 @@
+import {GithubConfig} from '@angular/dev-infra-private/utils/config';
+
+/**
+ * Github configuration for the `ng-dev` toolset.
+ */
+export const github: GithubConfig = {
+  name: 'vscode-ng-language-service',
+  owner: 'angular',
+};

.ng-dev/merge.ts

@@ -0,0 +1,36 @@
+import {DevInfraMergeConfig} from '@angular/dev-infra-private/pr/merge/config'
+import {getDefaultTargetLabelConfiguration} from '@angular/dev-infra-private/pr/merge/defaults';
+import {ReleaseConfig} from '@angular/dev-infra-private/release/config';
+
+import {github} from './github'
+
+/** Configuration for the `ng-dev release` command, defined here for use by the merge config. */
+export const release: ReleaseConfig = {
+  npmPackages: ['@angular/language-server'],
+  buildPackages: async () => [],
+  generateReleaseNotesForHead: async () => {},
+};
+
+
+/**
+ * Configuration for the merge tool in `ng-dev`. This sets up the labels which
+ * are respected by the merge script (e.g. the target labels).
+ */
+export const merge: DevInfraMergeConfig['merge'] = async api => {
+  return {
+    // By default, the merge script merges locally with `git cherry-pick` and autosquash.
+    // This has the downside of pull requests showing up as `Closed` instead of `Merged`.
+    // In the components repository, since we don't use fixup or squash commits, we can
+    // use the Github API merge strategy. That way we ensure that PRs show up as `Merged`.
+    githubApiMerge: {
+      default: 'squash',
+      labels: [
+        {pattern: 'preserve commits', method: 'rebase'},
+      ],
+    },
+    claSignedLabel: 'cla: yes',
+    mergeReadyLabel: 'action: merge',
+    commitMessageFixupLabel: 'commit message fixup',
+    labels: await getDefaultTargetLabelConfiguration(api, github, release),
+  };
+};

package.json

@@ -160,6 +160,7 @@
     "vscode-uri": "3.0.2"
   },
   "devDependencies": {
+    "@angular/dev-infra-private": "https://github.com/angular/dev-infra-private-builds.git#aeb8676ab6275272829e9d68388ec2e6c73b4eaa",
     "@types/jasmine": "3.6.3",
     "@types/node": "12.19.16",
     "clang-format": "1.5.0",