feat(docs-infra): add the ability to expose globals (#34237)

Adds the ability to expose global symbols in the API docs via the `@globalApi` tag. Also supports optionally setting a namespace which will be added to the name automatically (e.g. `foo` will be renamed to `ng.foo`). Relevant APIs should also be exported through the `global.ts` file which will show up under `core/global`.

PR Close #34237

aio/tools/transforms/angular-api-package/processors/updateGlobalApiPath.spec.js

@@ -0,0 +1,37 @@
+const testPackage = require('../../helpers/test-package');
+const processorFactory = require('./updateGlobalApiPath');
+const Dgeni = require('dgeni');
+
+describe('updateGlobalApiPath processor', () => {
+  it('should be available on the injector', () => {
+    const dgeni = new Dgeni([testPackage('angular-api-package')]);
+    const injector = dgeni.configureInjector();
+    const processor = injector.get('updateGlobalApiPathProcessor');
+    expect(processor.$process).toBeDefined();
+  });
+
+  it('should run before the correct processor', () => {
+    const processor = processorFactory();
+    expect(processor.$runBefore).toEqual(['processNgModuleDocs']);
+  });
+
+  it('should run after the correct processor', () => {
+    const processor = processorFactory();
+    expect(processor.$runAfter).toEqual(['computePathsProcessor']);
+  });
+
+  it('should update the paths of namespaced global APIs', () => {
+    const processor = processorFactory();
+    const docs = [{
+      docType: 'function',
+      moduleDoc: { moduleFolder: 'folder' },
+      name: 'ng.withNamespace',
+      globalNamespace: 'ng',
+      unprefixedName: 'withNamespace',
+      global: true
+    }];
+    processor.$process(docs);
+    expect(docs[0].path).toBe('folder/ngWithNamespace');
+    expect(docs[0].outputPath).toBe('folder/ngWithNamespace.json');
+  });
+});