Nullish coalescing operator can break redux-saga-babel-plugin

[Nantris]

Steps to reproduce

First, of course, enable the Babel plugin. Then run some code like:

function* someFunc({ payload: { bool } }) {
  bool = yield bool ?? select(getBool); // << TypeError: Object.defineProperty called on non-object
}

Description of the bug/issue

The code will error with, Object.defineProperty called on non-object

This appears to be caused by these lines of code in the plugin:

redux-saga/packages/babel-plugin-redux-saga/src/index.js

Lines 30 to 38 in 6f07fca

   var extendExpressionWithLocationTemplate = template(` 
     Object.defineProperty(TARGET, SYMBOL_NAME, { 
       value: { 
         fileName: FILENAME, 
         lineNumber: LINE_NUMBER, 
         code: SOURCE_CODE, 
       }, 
     }); 
   `) 

Steps to reproduce the bug/issue

@Andarist does the issue template intentionally have "Steps to reproduce" twice? I guess so since they're different header levels, but it's a little confusing.

Example

I don't think a CodeSandbox can apply the Babel Plugin, but correct me if I'm wrong. I won't have time to make a full repro repo for this.

Actual results

Object.defineProperty called on non-object

The Expected results

Babel plugin does not change result of executed code.

Environment information

• redux-saga version: 1.2.1
• babel: version 7.17.10
• babel-plugin-redux-saga: version 1.1.3

Additional info

This alternative syntax, suggested by @Andarist, worked without provoking the error:

function* someFunc({ payload: { bool } }) {
  bool ??= yield select(getBool);
}

[Mateusz Burzyński]

Note that the issue is probably not specific to nullish coalescing operator. I'd expect this to either break on yields that don't yield an effect or on yields that mix effect with non-object values