fix(compiler): support . in import statements. (#20634)

fix #20363

PR Close #20634

Author: MarkChrisLevy

packages/compiler-cli/src/transformers/compiler_host.ts

@@ -18,7 +18,7 @@ import {CompilerHost, CompilerOptions, LibrarySummary} from './api';
 import {MetadataReaderHost, createMetadataReaderCache, readMetadata} from './metadata_reader';
 import {DTS, GENERATED_FILES, isInRootDir, relativeToRootDirs} from './util';
 
-const NODE_MODULES_PACKAGE_NAME = /node_modules\/((\w|-)+|(@(\w|-)+\/(\w|-)+))/;
+const NODE_MODULES_PACKAGE_NAME = /node_modules\/((\w|-|\.)+|(@(\w|-|\.)+\/(\w|-|\.)+))/;
 const EXT = /(\.ts|\.d\.ts|\.js|\.jsx|\.tsx)$/;
 
 export function createCompilerHost(

packages/compiler-cli/test/transformers/compiler_host_spec.ts

@@ -65,6 +65,11 @@ describe('NgCompilerHost', () => {
           .toBe('@angular/core');
     });
 
+    it('should allow an import o a package whose name contains dot (e.g. @angular.io)', () => {
+      expect(host.fileNameToModuleName('/tmp/node_modules/@angular.io/core.d.ts', '/tmp/main.ts'))
+          .toBe('@angular.io/core');
+    });
+
     it('should use a package import when accessing a package from another package', () => {
       expect(host.fileNameToModuleName(
                  '/tmp/node_modules/mod1/index.d.ts', '/tmp/node_modules/mod2/index.d.ts'))