ci: set up golden file for typescript circular dependencies (#35647)

Sets up a golden file for the TypeScript circular dependencies for
source files inside of the `packages/` folder.

Also sets up the appropriate Yarn shorthand scripts, and a codeowner
group that is soley responsible for verifying changes to the golden.

PR Close #35647

.pullapprove.yml

@@ -1025,6 +1025,24 @@ groups:
         - ~framework-global-approvers
 
 
+  # ================================================
+  #  Circular dependencies
+  # ================================================
+  circular-dependencies:
+    conditions:
+      - >
+        contains_any_globs(files, [
+          'goldens/packages-circular-deps.json'
+        ])
+    reviewers:
+      users:
+        - IgorMinar
+        - josephperrott
+        - kara
+      teams:
+        - ~framework-global-approvers
+
+
 ####################################################################################
 #  Special Cases
 ####################################################################################

dev-infra/ts-circular-dependencies/index.ts

@@ -120,9 +120,17 @@ export function main(
         chalk.yellow(`   Fixed circular dependencies that need to be removed from the golden:`));
     fixedCircularDeps.forEach(c => console.error(`     • ${convertReferenceChainToString(c)}`));
     console.info();
-    console.info(chalk.yellow(
-        `   Please update the golden. The following command can be ` +
-        `run: yarn ts-circular-deps approve ${getRelativePath(baseDir, goldenFile)}.`));
+    // Print the command for updating the golden. Note that we hard-code the script name for
+    // approving default packages golden in `goldens/`. We cannot infer the script name passed to
+    // Yarn automatically since script are launched in a child process where `argv0` is different.
+    if (resolve(goldenFile) === resolve(projectDir, 'goldens/packages-circular-deps.json')) {
+      console.info(
+          chalk.yellow(`   Please approve the new golden with: yarn ts-circular-deps:approve`));
+    } else {
+      console.info(chalk.yellow(
+          `   Please update the golden. The following command can be ` +
+          `run: yarn ts-circular-deps approve ${getRelativePath(baseDir, goldenFile)}.`));
+    }
   }
   return 1;
 }

goldens/README.md

@@ -8,4 +8,18 @@ To check or update the public api goldens, run one of the following commands:
 ```bash
 yarn public-api:check
 yarn public-api:update
-```
+```
+
+### *`packages-circular-deps.json`*
+
+This golden file contains a list of all circular dependencies in the project. As part of the
+lint CI job we compare the current circular dependencies against this golden to ensure that
+we don't add more cycles. If cycles have been fixed, this file is also updated so that we can
+slowly burn down the number of cycles in the project.
+
+To check or update the golden, run the following commands:
+
+```bash
+yarn ts-circular-deps:check
+yarn ts-circular-deps:approve
+```

package.json

@@ -35,7 +35,9 @@
     "tslint": "tsc -p tools/tsconfig.json && tslint -c tslint.json \"+(packages|modules|scripts|tools)/**/*.+(js|ts)\"",
     "public-api:check": "node goldens/public-api/manage.js test",
     "public-api:update": "node goldens/public-api/manage.js accept",
-    "ts-circular-deps": "ts-node dev-infra/ts-circular-dependencies/index.ts"
+    "ts-circular-deps": "ts-node dev-infra/ts-circular-dependencies/index.ts",
+    "ts-circular-deps:check": "yarn -s ts-circular-deps check ./goldens/packages-circular-deps.json",
+    "ts-circular-deps:approve": "yarn -s ts-circular-deps approve ./goldens/packages-circular-deps.json"
   },
   "// 1": "dependencies are used locally and by bazel",
   "dependencies": {