feat(bazel): allow passing a custom bazel compiler host to ngc compile (#31341)

ayazhafiz · alxhub · commit a29dc961a2d8 · 2019-06-28T12:18:20.000-07:00
Enable users to pass a custom Bazel CompilerHost to use for an Angular compilation. This supports users who must override the TypeScript compiler host. PR Close #31341
diff --git a/packages/bazel/src/ngc-wrapped/index.ts b/packages/bazel/src/ngc-wrapped/index.ts
@@ -145,13 +145,15 @@ export function relativeToRootDirs(filePath: string, rootDirs: string[]): string
 }
 
 export function compile({allDepsCompiledWithBazel = true, compilerOpts, tsHost, bazelOpts, files,
-                         inputs, expectedOuts, gatherDiagnostics}: {
+                         inputs, expectedOuts, gatherDiagnostics, bazelHost}: {
   allDepsCompiledWithBazel?: boolean,
   compilerOpts: ng.CompilerOptions,
   tsHost: ts.CompilerHost, inputs?: {[path: string]: string},
   bazelOpts: BazelOptions,
   files: string[],
-  expectedOuts: string[], gatherDiagnostics?: (program: ng.Program) => ng.Diagnostics
+  expectedOuts: string[],
+  gatherDiagnostics?: (program: ng.Program) => ng.Diagnostics,
+  bazelHost?: CompilerHost,
 }): {diagnostics: ng.Diagnostics, program: ng.Program} {
   let fileLoader: FileLoader;
 
@@ -244,8 +246,10 @@ export function compile({allDepsCompiledWithBazel = true, compilerOpts, tsHost,
         moduleName, containingFile, compilerOptions, generatedFileModuleResolverHost);
   }
 
-  const bazelHost = new CompilerHost(
-      files, compilerOpts, bazelOpts, tsHost, fileLoader, generatedFileModuleResolver);
+  if (!bazelHost) {
+    bazelHost = new CompilerHost(
+        files, compilerOpts, bazelOpts, tsHost, fileLoader, generatedFileModuleResolver);
+  }
 
   // Also need to disable decorator downleveling in the BazelHost in Ivy mode.
   if (isInIvyMode) {
