domoritz commented on a change in pull request #10673:
URL: https://github.com/apache/arrow/pull/10673#discussion_r665448616



##########
File path: js/jest.config.js
##########
@@ -45,7 +45,8 @@ module.exports = {
       "^.+\\.tsx?$": "ts-jest"
     },
     "transformIgnorePatterns": [
-      "/node_modules/(?!web-stream-tools).+\\.js$"
+      "/node_modules/(?!web-stream-tools).+\\.js$",
+      ".*/cjs/.*\\.js$"

Review comment:
       Without this, I am getting this strange error when I run `yarn gulp 
test:es5:cjs`?
   
   ```
   ts-jest[ts-compiler] (WARN) Unable to process 
'/Users/dominik/Code/arrow/js/targets/es5/cjs/io/adapters.js', falling back to 
original file content. You can also configure Jest config option 
`transformIgnorePatterns` to ignore 
/Users/dominik/Code/arrow/js/targets/es5/cjs/io/adapters.js from transformation 
or make sure that `outDir` in your tsconfig is neither `''` or `'.'`
   ```
   
   Any idea what's causing it?




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