A bug?

[birdofpreyru]

bb720d2#diff-ad0be0b5e1f4711c408a42bdbea512bcR43-R57

☝️ @SimenB This code change in your recent commit does break some tests in my code which used to work before. The issue I experience is that it is getting called from @jest/transform/build/ScriptTransformer.js:364:31 with null passed in as inputOptions argument, in this case the default {} value is not applied to inputOptions, it remains null and the code crashes at the line ...inputOptions.caller due to access to a field of null.

[SimenB]

PR welcome changing to

diff --git i/packages/babel-jest/src/index.ts w/packages/babel-jest/src/index.ts
index 50259e0ec..5a23c4fdb 100644
--- i/packages/babel-jest/src/index.ts
+++ w/packages/babel-jest/src/index.ts
@@ -41,8 +41,9 @@ interface BabelJestTransformOptions extends TransformOptions {
 }
 
 const createTransformer = (
-  inputOptions: TransformOptions = {},
+  userOptions?: TransformOptions | null,
 ): BabelJestTransformer => {
+  const inputOptions: TransformOptions = userOptions ?? {};
   const options: BabelJestTransformOptions = {
     ...inputOptions,
     caller: {

along with some tests 🙂

[yinm]

Can I take this issue?

[SimenB]

Go for it @yinm!

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