Make "browser" field work with the destination too

Reviewed By: rafeca

Differential Revision: D7974989

fbshipit-source-id: f1a14dbd44a82c1929525416b56f455a6a685bcd

packages/metro-resolver/src/resolve.js

@@ -113,7 +113,8 @@ function resolve(
 
   const allDirPaths = dirPaths.concat(extraPaths);
   for (let i = 0; i < allDirPaths.length; ++i) {
-    const result = resolveFileOrDir(context, allDirPaths[i], platform);
+    const realModuleName = context.redirectModulePath(allDirPaths[i]);
+    const result = resolveFileOrDir(context, realModuleName, platform);
     if (result.type === 'resolved') {
       return result.resolution;
     }
@@ -127,11 +128,6 @@ type ModulePathContext = FileOrDirContext & {
    * resolved.
    */
   +originModulePath: string,
-  /**
-   * Lookup the module's closest `package.json` and process the redirects
-   * metadata. Return an absolute path to the resolved path.
-   */
-  +redirectModulePath: (modulePath: string) => string | false,
 };
 
 /**
@@ -347,6 +343,7 @@ type FileContext = {
   +doesFileExist: DoesFileExist,
   +isAssetFile: IsAssetFile,
   +preferNativePlatform: boolean,
+  +redirectModulePath: (modulePath: string) => string | false,
   +resolveAsset: ResolveAsset,
   +sourceExts: $ReadOnlyArray<string>,
 };

packages/metro/src/DeltaBundler/__tests__/__snapshots__/traverseDependencies-integration-test.js.snap

@@ -1526,7 +1526,7 @@ Array [
   },
   Object {
     "dependencies": Array [],
-    "path": "/root/node_modules/foo/node_modules/bar/lol.js",
+    "path": "/root/node_modules/foo/node_modules/bar/wow.js",
   },
   Object {
     "dependencies": Array [],
@@ -1878,7 +1878,7 @@ Array [
   },
   Object {
     "dependencies": Array [],
-    "path": "C:\\\\root\\\\node_modules\\\\foo\\\\node_modules\\\\bar\\\\lol.js",
+    "path": "C:\\\\root\\\\node_modules\\\\foo\\\\node_modules\\\\bar\\\\wow.js",
   },
   Object {
     "dependencies": Array [],

packages/metro/src/node-haste/DependencyGraph/ModuleResolution.js

@@ -75,10 +75,22 @@ class ModuleResolver<TModule: Moduleish, TPackage: Packageish> {
   }
 
   _redirectRequire(fromModule: TModule, modulePath: string): string | false {
-    const pck = fromModule.getPackage();
-    if (pck) {
-      return pck.redirectRequire(modulePath);
+    const moduleCache = this._options.moduleCache;
+
+    try {
+      const pck =
+        modulePath.startsWith('.') || path.isAbsolute(modulePath)
+          ? moduleCache.getModule(modulePath).getPackage()
+          : fromModule.getPackage();
+
+      if (pck) {
+        return pck.redirectRequire(modulePath);
+      }
+    } catch (err) {
+      // Do nothing. The standard module cache does not trigger any error, but
+      // the ModuleGraph one does, if the module does not exist.
     }
+
     return modulePath;
   }