Add option to throw/not throw when module can't resolve

Reviewed By: martinbigio

Differential Revision: D2808973

fb-gh-sync-id: 2e06355d1e0dd3c1ea297273c44858ec4ed574ee

packager/react-packager/src/DependencyResolver/DependencyGraph/ResolutionRequest.js

@@ -25,6 +25,7 @@ class ResolutionRequest {
     helpers,
     moduleCache,
     fastfs,
+    shouldThrowOnUnresolvedErrors,
   }) {
     this._platform = platform;
     this._preferNativePlatform = preferNativePlatform;
@@ -34,6 +35,7 @@ class ResolutionRequest {
     this._helpers = helpers;
     this._moduleCache = moduleCache;
     this._fastfs = fastfs;
+    this._shouldThrowOnUnresolvedErrors = shouldThrowOnUnresolvedErrors;
     this._resetResolutionCache();
   }
 
@@ -67,8 +69,10 @@ class ResolutionRequest {
     };
 
     const forgive = (error) => {
-      if (error.type !== 'UnableToResolveError' ||
-        this._platform === 'ios') {
+      if (
+        error.type !== 'UnableToResolveError' ||
+        this._shouldThrowOnUnresolvedErrors(this._entryPath, this._platform)
+      ) {
         throw error;
       }
 

packager/react-packager/src/DependencyResolver/DependencyGraph/__tests__/DependencyGraph-test.js

@@ -70,6 +70,7 @@ describe('DependencyGraph', function() {
         'parse',
       ],
       platforms: ['ios', 'android'],
+      shouldThrowOnUnresolvedErrors: () => false,
     };
   });
 

packager/react-packager/src/DependencyResolver/DependencyGraph/index.js

@@ -42,6 +42,7 @@ class DependencyGraph {
     extensions,
     mocksPattern,
     extractRequires,
+    shouldThrowOnUnresolvedErrors = () => true,
   }) {
     this._opts = {
       activity: activity || defaultActivity,
@@ -57,6 +58,7 @@ class DependencyGraph {
       extensions: extensions || ['js', 'json'],
       mocksPattern,
       extractRequires,
+      shouldThrowOnUnresolvedErrors,
     };
     this._cache = this._opts.cache;
     this._helpers = new DependencyGraphHelpers(this._opts);
@@ -163,6 +165,7 @@ class DependencyGraph {
         helpers: this._helpers,
         moduleCache: this._moduleCache,
         fastfs: this._fastfs,
+        shouldThrowOnUnresolvedErrors: this._opts.shouldThrowOnUnresolvedErrors,
       });
 
       const response = new ResolutionResponse();

packager/react-packager/src/Resolver/index.js

@@ -95,6 +95,7 @@ class Resolver {
       preferNativePlatform: true,
       fileWatcher: opts.fileWatcher,
       cache: opts.cache,
+      shouldThrowOnUnresolvedErrors: (_, platform) => platform === 'ios',
     });
 
     this._polyfillModuleNames = opts.polyfillModuleNames || [];