capacitor-community / capacitor-community/fcm

Jest failed to parse a file

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#103 1 comment 2 reactions 0 assignees View on GitHub
Dominant language
TypeScript
Stars
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Forks
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Description

**Describe the bug**
When running a basic jest test on the component that ` import { FCM } from '@capacitor-community/fcm';` I get the following error

```
Jest encountered an unexpected token

Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

By default "node_modules" folder is ignored by transformers.

Here's what you can do:
• If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
• To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
• If you need a custom transformation specify a "transform" option in your config.
• If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/configuration
For information about custom transformations, see:
https://jestjs.io/docs/code-transformation

Details:

/home/paddy/sites/app/client/node_modules/@capacitor-community/fcm/dist/esm/index.js:1
({"Object.":function(module,exports,require,__dirname,__filename,jest){import { registerPlugin } from "@capacitor/core";
^^^^^^

SyntaxError: Cannot use import statement outside a module
```
**Additional context**

Ionic:

Ionic Core : 5.6.11
Ionic Framework : @ionic/react 5.6.11

Capacitor:

Capacitor CLI : 3.1.1
@capacitor/core : 3.1.1

System:

NodeJS : v14.18.1
npm : 6.14.15

I can see a similar issue related to ESM file parsing here https://github.com/capacitor-community/http/issues/29

But the suggestion https://github.com/capacitor-community/http/issues/29#issuecomment-654934290
to update the `transformIgnorePatterns` doesn't seem to be working here

jest.config
```
module.exports = {
...
transformIgnorePatterns: ['node_modules/(?!capacitor-community).+\\.js$'],
...
};

```

Contributor guide

Open the contributing guide

Research direction

Start with the jest.config mentioned in the report and the failing import from @capacitor-community/fcm/dist/esm/index.js. Reproduce the basic Jest test, then inspect how this package's ESM entry is handled; done means the FCM import parses successfully under Jest without the reported syntax error.

Written by the indexing model from the issue text.

Assessment

Tech stack
firebase, node.js, react, typescript
Domain
mobile-dev, testing-qa
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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