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https://github.com/cmdcolin/browser-nanoid-jest-repro
https://github.com/cmdcolin/browser-nanoid-jest-repro
Last synced: 4 days ago
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- Host: GitHub
- URL: https://github.com/cmdcolin/browser-nanoid-jest-repro
- Owner: cmdcolin
- Created: 2023-08-13T16:10:56.000Z (over 1 year ago)
- Default Branch: master
- Last Pushed: 2023-08-13T16:15:12.000Z (over 1 year ago)
- Last Synced: 2024-04-15T02:14:33.817Z (7 months ago)
- Language: TypeScript
- Size: 45.9 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# using nanoid under jest issue
This error isn't really related to ts-jest but it was the easiest way to setup the testing environment, and use jest-environment-jsdom. This makes nanoid use the index.browser.js. This in turn has 'pure-ESM' imports that are not really compatible with jest without further configuration. I would like to not configure jest to transpile nanoid particularly, because I want to ship a library that I would like to use nanoid, but I don't want my users to have to, in turn, configure their jest environments in a custom way
## setup
```
git clone repo
cd repo
yarn
yarn test
```## error
```yarn run v1.22.19
warning package.json: No license field
$ jest
FAIL src/file.test.ts
● Test suite failed to runJest 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.
• If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
• 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-transformationDetails:
/home/cdiesh/proj/node_modules/nanoid/index.browser.js:1
({"Object.":function(module,exports,require,__dirname,__filename,jest){export { urlAlphabet } from './url-alphabet/index.js'
^^^^^^SyntaxError: Unexpected token 'export'
> 1 | import {nanoid} from 'nanoid'
| ^
2 |
3 | export function getNano() {
4 | return nanoid()at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1496:14)
at Object. (src/file.ts:1:1)
at Object. (src/file.test.ts:1:1)Test Suites: 1 failed, 1 total
Tests: 0 total
Snapshots: 0 total
Time: 1.121 s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.```
## note
this error happens whether nanoid v3 or v4 is used
## question
is the special browser bundle necessary?