added rest of changes

packages/metro/src/DeltaBundler/types.flow.js

@@ -10,12 +10,24 @@
 
 'use strict';
 
-import type {RequireContextParams} from '../ModuleGraph/worker/collectDependencies';
+import type {
+  RequireContextParams,
+  ContextMode,
+} from '../ModuleGraph/worker/collectDependencies';
 import type {PrivateState} from './graphOperations';
 import type {JsTransformOptions} from 'metro-transform-worker';
 
 import CountingSet from '../lib/CountingSet';
 
+export type RequireContext = {
+  /* Should search for files recursively. Optional, default `true` when `require.context` is used */
+  recursive: boolean,
+  /* Filename filter pattern for use in `require.context`. Optional, default `.*` (any file) when `require.context` is used */
+  filter: RegExp,
+  /** Mode for resolving dynamic dependencies. Defaults to `sync` */
+  mode: ContextMode,
+};
+
 export type MixedOutput = {
   +data: mixed,
   +type: string,
@@ -63,6 +75,7 @@ export type Dependency = {
 };
 
 export type Module<T = MixedOutput> = {
+  +contextParams?: RequireContext,
   +dependencies: Map<string, Dependency>,
   +inverseDependencies: CountingSet<string>,
   +output: $ReadOnlyArray<T>,
@@ -104,6 +117,12 @@ export type TransformResultWithSource<T = MixedOutput> = $ReadOnly<{
   getSource: () => Buffer,
 }>;
 
+/** Transformer for generating `require.context` virtual module. */
+export type TransformContextFn<T = MixedOutput> = (
+  string,
+  RequireContext,
+) => Promise<TransformResultWithSource<T>>;
+
 export type TransformFn<T = MixedOutput> = string => Promise<
   TransformResultWithSource<T>,
 >;
@@ -115,11 +134,14 @@ export type AllowOptionalDependencies =
   | AllowOptionalDependenciesWithOptions;
 
 export type Options<T = MixedOutput> = {
-  +resolve: (from: string, to: string) => string,
+  +resolve: (from: string, to: string, context?: ?RequireContext) => string,
   +transform: TransformFn<T>,
+  /** Given a path and require context, return a virtual context module. */
+  +transformContext: TransformContextFn<T>,
   +transformOptions: TransformInputOptions,
   +onProgress: ?(numProcessed: number, total: number) => mixed,
   +experimentalImportBundleSupport: boolean,
+  +unstable_allowRequireContext: boolean,
   +shallow: boolean,
 };
 

packages/metro/src/IncrementalBundler.js

@@ -130,6 +130,8 @@ class IncrementalBundler {
       onProgress: otherOptions.onProgress,
       experimentalImportBundleSupport:
         this._config.transformer.experimentalImportBundleSupport,
+      unstable_allowRequireContext:
+        this._config.transformer.unstable_allowRequireContext,
       shallow: otherOptions.shallow,
     });
 
@@ -160,6 +162,13 @@ class IncrementalBundler {
           this._bundler,
           transformOptions.platform,
         ),
+        transformContext: await transformHelpers.getTransformContextFn(
+          absoluteEntryFiles,
+          this._bundler,
+          this._deltaBundler,
+          this._config,
+          transformOptions,
+        ),
         transform: await transformHelpers.getTransformFn(
           absoluteEntryFiles,
           this._bundler,
@@ -171,6 +180,8 @@ class IncrementalBundler {
         onProgress: otherOptions.onProgress,
         experimentalImportBundleSupport:
           this._config.transformer.experimentalImportBundleSupport,
+        unstable_allowRequireContext:
+          this._config.transformer.unstable_allowRequireContext,
         shallow: otherOptions.shallow,
       },
     );
@@ -225,6 +236,8 @@ class IncrementalBundler {
       shallow: otherOptions.shallow,
       experimentalImportBundleSupport:
         this._config.transformer.experimentalImportBundleSupport,
+      unstable_allowRequireContext:
+        this._config.transformer.unstable_allowRequireContext,
     });
     const revisionId = createRevisionId();
     const revisionPromise = (async () => {