From 629ebf2da675a7fd3a9577efbe61b1208e3fd1da Mon Sep 17 00:00:00 2001
From: Yen-Chi Chen <gruenen@gmail.com>
Date: Sun, 3 May 2020 21:48:51 +0200
Subject: [PATCH] incorporate feedbacks

---
 babel.config.js                               |  5 ++-
 .../jest-transform/src/ScriptTransformer.ts   | 35 +++++++++++--------
 packages/jest-transform/src/types.ts          | 20 +++++------
 3 files changed, 34 insertions(+), 26 deletions(-)

diff --git a/babel.config.js b/babel.config.js
index d2ff271d1ea6..129f3490ba30 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -40,7 +40,10 @@ module.exports = {
           },
         ],
       ],
-      test: 'packages/jest-config/src/readConfigFileAndSetRootDir.ts',
+      test: [
+        'packages/jest-config/src/readConfigFileAndSetRootDir.ts',
+        'packages/jest-transform/src/ScriptTransformer.ts'
+      ],
     },
   ],
   plugins: [
diff --git a/packages/jest-transform/src/ScriptTransformer.ts b/packages/jest-transform/src/ScriptTransformer.ts
index ef298011f276..a99c521d1732 100644
--- a/packages/jest-transform/src/ScriptTransformer.ts
+++ b/packages/jest-transform/src/ScriptTransformer.ts
@@ -29,6 +29,8 @@ import type {
   TransformResult,
   TransformedSource,
   Transformer,
+  SyncTransformer,
+  AsyncTransformer
 } from './types';
 import shouldInstrument from './shouldInstrument';
 import handlePotentialSyntaxError from './enhanceUnexpectedTokenMessage';
@@ -114,7 +116,7 @@ export default class ScriptTransformer {
   }
 
   private _getCacheKey(
-    fileData: string,
+    content: string,
     filename: Config.Path,
     instrument: boolean,
     supportsDynamicImport: boolean,
@@ -126,7 +128,7 @@ export default class ScriptTransformer {
 
     if (transformer && typeof transformer.getCacheKey === 'function') {
       transformerCacheKey = transformer.getCacheKey(
-        fileData,
+        content,
         filename,
         configString,
         {
@@ -139,7 +141,7 @@ export default class ScriptTransformer {
       );
     }
     return this._buildCacheKeyFromFileInfo(
-      fileData,
+      content,
       filename,
       instrument,
       configString,
@@ -148,7 +150,7 @@ export default class ScriptTransformer {
   }
 
   private async _getCacheKeyAsync(
-    fileData: string,
+    content: string,
     filename: Config.Path,
     instrument: boolean,
     supportsDynamicImport: boolean,
@@ -160,7 +162,7 @@ export default class ScriptTransformer {
 
     if (transformer && typeof transformer.getCacheKeyAsync === 'function') {
       transformerCacheKey = await transformer.getCacheKeyAsync(
-        fileData,
+        content,
         filename,
         configString,
         {
@@ -173,7 +175,7 @@ export default class ScriptTransformer {
       );
     }
     return this._buildCacheKeyFromFileInfo(
-      fileData,
+      content,
       filename,
       instrument,
       configString,
@@ -259,7 +261,7 @@ export default class ScriptTransformer {
   }
 
   private async _getTransformerAsync(filename: Config.Path) {
-    let transform: Transformer | null = null;
+    let transform: AsyncTransformer | null = null;
     if (!this._config.transform || !this._config.transform.length) {
       return null;
     }
@@ -294,7 +296,7 @@ export default class ScriptTransformer {
   }
 
   private _getTransformer(filename: Config.Path) {
-    let transform: Transformer | null = null;
+    let transform: SyncTransformer | null = null;
     if (!this._config.transform || !this._config.transform.length) {
       return null;
     }
@@ -592,17 +594,20 @@ export default class ScriptTransformer {
     let processed: TransformedSource | null = null;
 
     if (transform && shouldCallTransform) {
-      processed = transform.processAsync
-        ? await transform.processAsync(content, filename, this._config, {
+
+      if(transform.processAsync) {
+        processed = await transform.processAsync(content, filename, this._config, {
             instrument,
             supportsDynamicImport,
             supportsStaticESM,
           })
-        : transform.process(content, filename, this._config, {
-            instrument,
-            supportsDynamicImport,
-            supportsStaticESM,
-          });
+      } else if (transform.process) {
+        processed = transform.process(content, filename, this._config, {
+          instrument,
+          supportsDynamicImport,
+          supportsStaticESM,
+        });
+      }
 
       if (
         processed == null ||
diff --git a/packages/jest-transform/src/types.ts b/packages/jest-transform/src/types.ts
index 01f6af70f475..a305a2d2353e 100644
--- a/packages/jest-transform/src/types.ts
+++ b/packages/jest-transform/src/types.ts
@@ -52,19 +52,19 @@ export interface CacheKeyOptions extends TransformOptions {
   rootDir: string;
 }
 
-interface SyncTransFormer {
+export interface SyncTransformer {
   canInstrument?: boolean;
-  createTransformer?: (options?: any) => SyncTransFormer;
+  createTransformer?: (options?: any) => SyncTransformer;
 
   getCacheKey?: (
-    fileDate: string,
+    content: string,
     filePath: Config.Path,
     configStr: string,
     options: CacheKeyOptions,
   ) => string;
 
   getCacheKeyAsync?: (
-    fileDate: string,
+    content: string,
     filePath: Config.Path,
     configStr: string,
     options: CacheKeyOptions,
@@ -85,32 +85,32 @@ interface SyncTransFormer {
   ) => Promise<TransformedSource>;
 }
 
-interface AsyncTransformer {
+export interface AsyncTransformer {
   canInstrument?: boolean;
   createTransformer?: (options?: any) => AsyncTransformer;
 
   getCacheKey?: (
-    fileDate: string,
+    content: string,
     filePath: Config.Path,
     configStr: string,
     options: CacheKeyOptions,
   ) => string;
 
   getCacheKeyAsync?: (
-    fileDate: string,
+    content: string,
     filePath: Config.Path,
     configStr: string,
     options: CacheKeyOptions,
   ) => Promise<string>;
 
-  process: (
+  process?: (
     sourceText: string,
     sourcePath: Config.Path,
     config: Config.ProjectConfig,
     options?: TransformOptions,
   ) => TransformedSource;
 
-  processAsync?: (
+  processAsync: (
     sourceText: string,
     sourcePath: Config.Path,
     config: Config.ProjectConfig,
@@ -118,4 +118,4 @@ interface AsyncTransformer {
   ) => Promise<TransformedSource>;
 }
 
-export type Transformer = SyncTransFormer | AsyncTransformer;
+export type Transformer = SyncTransformer | AsyncTransformer;