From e2a51b2873898dcfc0a1b03a49f48ce70ea70f0a Mon Sep 17 00:00:00 2001
From: Alexander von Weiss <alexander.weiss@rebuy.com>
Date: Fri, 23 Apr 2021 12:42:07 +0200
Subject: [PATCH] feat(jest): support jest 27 transformerConfig

---
 packages/jest/index.ts | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/packages/jest/index.ts b/packages/jest/index.ts
index 05ba491d6..0861a0694 100644
--- a/packages/jest/index.ts
+++ b/packages/jest/index.ts
@@ -1,14 +1,34 @@
 import { createHash } from 'crypto'
 
-import { transformJest } from '@swc-node/core'
+import { Options, transformJest } from '@swc-node/core'
 import { Output } from '@swc/core'
 
 const Cache = new Map<string, Output>()
 
+interface JestConfig26 {
+  transform: [match: string, transformerPath: string, options: Options][]
+}
+
+interface JestConfig27 {
+  transformerConfig: Options
+}
+
+function getJestTransformConfig(jestConfig: JestConfig26 | JestConfig27): Options {
+  if ('transformerConfig' in jestConfig) {
+    // jest 27
+    return jestConfig.transformerConfig
+  }
+
+  if ('transform' in jestConfig) {
+    // jest 26
+    return jestConfig.transform.find(([, transformerPath]) => transformerPath === __filename)?.[2] ?? {}
+  }
+
+  return {}
+}
+
 export = {
-  process(src: string, path: string, jestConfig: any) {
-    const [, , transformOptions = {}] =
-      (jestConfig.transform || []).find(([, transformerPath]: [string, string]) => transformerPath === __filename) || []
+  process(src: string, path: string, jestConfig: JestConfig26 | JestConfig27) {
     if (/\.(t|j)sx?$/.test(path)) {
       // sha1 is fast, and we don't care about security here
       const cacheHash = createHash('sha1')
@@ -18,7 +38,7 @@ export = {
       if (Cache.has(cacheKey)) {
         return Cache.get(cacheKey)
       }
-      const output = transformJest(src, path, transformOptions)
+      const output = transformJest(src, path, getJestTransformConfig(jestConfig))
       Cache.set(cacheKey, output)
       return output
     }