From 6199ea5d4a83b12c0760c2f7dfc77913f7fb5d27 Mon Sep 17 00:00:00 2001
From: Greg Magolan <gmagolan@gmail.com>
Date: Fri, 6 Apr 2018 11:08:19 -0700
Subject: [PATCH] fix(compiler-cli): shorten resolved module name in
 fileNameToModuleName to npm package name for typings (#23231)

PR Close #23231
---
 integration/bazel/BUILD.bazel                 |  7 ++--
 .../src/transformers/compiler_host.ts         | 33 ++++++++++++++++---
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/integration/bazel/BUILD.bazel b/integration/bazel/BUILD.bazel
index 2a800b8b5c..95347887f0 100644
--- a/integration/bazel/BUILD.bazel
+++ b/integration/bazel/BUILD.bazel
@@ -4,9 +4,12 @@ filegroup(
     name = "node_modules",
     srcs = glob(
         ["node_modules/**/*"],
-        # Exclude directories that commonly contain filenames which are
-        # illegal bazel labels
         exclude = [
+            # Exclude rxjs because we build it from sources using the label @rxjs//:rxjs
+            "node_modules/rxjs/**",
+
+            # Exclude directories that commonly contain filenames which are
+            # illegal bazel labels
             # e.g. node_modules/adm-zip/test/assets/attributes_test/New folder/hidden.txt
             "node_modules/**/test/**",
             # e.g. node_modules/xpath/docs/function resolvers.md
diff --git a/packages/compiler-cli/src/transformers/compiler_host.ts b/packages/compiler-cli/src/transformers/compiler_host.ts
index 0d486f963e..963693257d 100644
--- a/packages/compiler-cli/src/transformers/compiler_host.ts
+++ b/packages/compiler-cli/src/transformers/compiler_host.ts
@@ -57,6 +57,7 @@ function assert<T>(condition: T | null | undefined) {
 export class TsCompilerAotCompilerTypeCheckHostAdapter implements ts.CompilerHost, AotCompilerHost,
     TypeCheckHost {
   private metadataReaderCache = createMetadataReaderCache();
+  private fileNameToModuleNameCache = new Map<string, string>();
   private flatModuleIndexCache = new Map<string, boolean>();
   private flatModuleIndexNames = new Set<string>();
   private flatModuleIndexRedirectNames = new Set<string>();
@@ -187,6 +188,12 @@ export class TsCompilerAotCompilerTypeCheckHostAdapter implements ts.CompilerHos
    *    import project sources.
    */
   fileNameToModuleName(importedFile: string, containingFile: string): string {
+    const cacheKey = `${importedFile}:${containingFile}`;
+    let moduleName = this.fileNameToModuleNameCache.get(cacheKey);
+    if (moduleName != null) {
+      return moduleName;
+    }
+
     const originalImportedFile = importedFile;
     if (this.options.traceResolution) {
       console.error(
@@ -196,11 +203,10 @@ export class TsCompilerAotCompilerTypeCheckHostAdapter implements ts.CompilerHos
 
     // drop extension
     importedFile = importedFile.replace(EXT, '');
-    const importedFilePackagName = getPackageName(importedFile);
+    const importedFilePackageName = getPackageName(importedFile);
     const containingFilePackageName = getPackageName(containingFile);
 
-    let moduleName: string;
-    if (importedFilePackagName === containingFilePackageName ||
+    if (importedFilePackageName === containingFilePackageName ||
         GENERATED_FILES.test(originalImportedFile)) {
       const rootedContainingFile = relativeToRootDirs(containingFile, this.rootDirs);
       const rootedImportedFile = relativeToRootDirs(importedFile, this.rootDirs);
@@ -211,12 +217,31 @@ export class TsCompilerAotCompilerTypeCheckHostAdapter implements ts.CompilerHos
         importedFile = rootedImportedFile;
       }
       moduleName = dotRelative(path.dirname(containingFile), importedFile);
-    } else if (importedFilePackagName) {
+    } else if (importedFilePackageName) {
       moduleName = stripNodeModulesPrefix(importedFile);
+      if (originalImportedFile.endsWith('.d.ts')) {
+        // the moduleName for these typings could be shortented to the npm package name
+        // if the npm package typings matches the importedFile
+        try {
+          const modulePath = importedFile.substring(0, importedFile.length - moduleName.length) +
+              importedFilePackageName;
+          const packageJson = require(modulePath + '/package.json');
+          const packageTypings = path.posix.join(modulePath, packageJson.typings);
+          if (packageTypings === originalImportedFile) {
+            moduleName = importedFilePackageName;
+          }
+        } catch (e) {
+          // the above require() will throw if there is no package.json file
+          // and this is safe to ignore and correct to keep the longer
+          // moduleName in this case
+        }
+      }
     } else {
       throw new Error(
           `Trying to import a source file from a node_modules package: import ${originalImportedFile} from ${containingFile}`);
     }
+
+    this.fileNameToModuleNameCache.set(cacheKey, moduleName);
     return moduleName;
   }