build: use new labeling and branching in merge script (#20295)

We introduced a new shared configuration for merge script
labels that follow the new proposal:

https://docs.google.com/document/d/197kVillDwx-RZtSVOBtPb4BBIAw0E9RT3q3v6DZkykU

These label semantics and the new branching are set up for the Angular
Components repository with this commit. The goal is that labeling and
merging is consistent between all Angular projects and that clear rules
are defined for branching/labeling. This was previously not the case

Author: devversion

.ng-dev/merge.ts

@@ -1,20 +1,12 @@
-import {MergeConfig} from '@angular/dev-infra-private/pr/merge/config';
-import {determineMergeBranches} from '@angular/dev-infra-private/pr/merge/determine-merge-branches';
+import {DevInfraMergeConfig} from '@angular/dev-infra-private/pr/merge/config';
+import {getDefaultTargetLabelConfiguration} from '@angular/dev-infra-private/pr/merge/defaults';
+import {github} from './github';
 
 /**
  * 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 = (): MergeConfig => {
-  const currentVersion = require('../package.json').version;
-  // We use the `@angular/cdk` as source of truth for the latest published version in NPM.
-  // Any package from the monorepo could technically work and result in the same version.
-
-  // TODO(devversion) Clean this up once the label/branching has been finalized.
-  // let {minor, patch} = determineMergeBranches(currentVersion, '@angular/cdk');
-  const patch = '10.1.x';
-  const minor = 'master';
-
+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`.
@@ -30,26 +22,6 @@ export const merge = (): MergeConfig => {
     mergeReadyLabel: 'merge ready',
     commitMessageFixupLabel: 'commit message fixup',
     caretakerNoteLabel: 'caretaker note',
-    labels: [
-      {
-        pattern: 'target: patch',
-        branches: ['master', patch],
-      },
-      {
-        pattern: 'target: minor',
-        // TODO: Clean this up after the labels/branching has been finalized.
-        branches: minor === 'master' ? ['master'] : ['master', minor],
-      },
-      {
-        pattern: 'target: major',
-        branches: ['master'],
-      },
-      {
-        pattern: 'target: development-branch',
-        // Merge PRs with the given label only into the target branch that has
-        // been specified through the Github UI.
-        branches: (target) => [target],
-      }
-    ],
+    labels: await getDefaultTargetLabelConfiguration(api, github, '@angular/cdk'),
   };
 };

package.json

@@ -74,7 +74,7 @@
     "@angular/bazel": "^10.0.8",
     "@angular/benchpress": "^0.2.1",
     "@angular/compiler-cli": "^10.0.8",
-    "@angular/dev-infra-private": "https://github.com/angular/dev-infra-private-builds.git#0612a30aaf7a7e7eb2a4a5a9fa0f58622ce59590",
+    "@angular/dev-infra-private": "https://github.com/angular/dev-infra-private-builds.git#d0855af987db4e426477da1780bcd02941c31271",
     "@angular/platform-browser-dynamic": "^10.0.8",
     "@angular/platform-server": "^10.0.8",
     "@angular/router": "^10.0.8",

yarn.lock

@@ -135,9 +135,9 @@
   dependencies:
     tslib "^1.9.0"
 
-"@angular/dev-infra-private@https://github.com/angular/dev-infra-private-builds.git#0612a30aaf7a7e7eb2a4a5a9fa0f58622ce59590":
+"@angular/dev-infra-private@https://github.com/angular/dev-infra-private-builds.git#d0855af987db4e426477da1780bcd02941c31271":
   version "0.0.0"
-  resolved "https://github.com/angular/dev-infra-private-builds.git#0612a30aaf7a7e7eb2a4a5a9fa0f58622ce59590"
+  resolved "https://github.com/angular/dev-infra-private-builds.git#d0855af987db4e426477da1780bcd02941c31271"
   dependencies:
     "@angular/benchpress" "0.2.0"
     "@octokit/graphql" "^4.3.1"
@@ -149,6 +149,7 @@
     inquirer "^7.1.0"
     minimatch "^3.0.4"
     multimatch "^4.0.0"
+    node-fetch "^2.6.0"
     node-uuid "1.4.8"
     semver "^6.3.0"
     shelljs "^0.8.3"