I'm implementing tests into an existing project that currently has no tests. My tests are failing to compile node_modules/
imports.
/Users/me/myproject/node_modules/lodash-es/lodash.js:10
export { default as add } from './add.js';
^^^^^^
SyntaxError: Unexpected token export
at transformAndBuildScript (node_modules/jest-runtime/build/transform.js:320:12)
at Object.<anonymous> (app/reducers/kind_reducer.js:2:43)
at Object.<anonymous> (app/reducers/index.js:12:47)
The workaround I've found is to 'whitelist' node_modules
in package.json jest config like this:
"jest": {
"transformIgnorePatterns": [
"!node_modules/"
]
}
This seems like a hack because it takes over 1 minute to run a simple test that imports node_modules/lodash-es/lodash.js
.
Any help or direction is appreciate, thanks!
If none of the above solutions worked for you, you can try this in your jest
"moduleNameMapper": {
"^lodash-es$": "lodash"
}
It will replace lodash-es
with the commonjs version during testing runtime.