First, many thanks to the contributors ! Nice project and utils 👍

I'm using a content script in main world context to dynamically extract "react props" from the whole dom tree for use in another content script not running in main world context.

In console logs the following abreviation stands for
MW: Main World
CS: Content Script

Messenger caller is in a CS without MW context

Failing: with error thrown but error message doesn't explain why No response

Error message just says

chunk-ALTBYIMW.js:80 Uncaught (in promise) Error: No response
    at Object.<anonymous> (chunk-ALTBYIMW.js:80:92)
    at Generator.next (<anonymous>)
    at fulfilled (chunk-ALTBYIMW.js:37:19)

The issue is that the return value object contains a function.

Example simplified code :

mainWorldMessenger.onMessage("test", (data) => {
  const props = [
    {
      "className": "ml-md",
      onClick: () => {
      }
    }
  ]

  const ret = {reactProps: props};
  log("return value will be", ret)

  return ret
});

Working: messenger func returns with value

mainWorldMessenger.onMessage("test", (data) => {
  const props = [
    {
      "className": "ml-md",
    }
  ]

  const ret = {reactProps: props};
  log("return value will be", ret)

  return ret
});

Solution

Return value can be sanitized.
An error message from @webext-core/messaging explaining why it doesn't return would be nice