Also using Babel, Typescript and Jest. Had the same failure, driving me crazy for hours.
Ended up creating a new babel.config.js
file specifically for the tests. Had a large .babelrc
that wasn’t getting picked up by jest no matter what i did to it. Main app still uses the .babelrc
as this overrides babel.config.js
files.
Install jest, ts-jest and babel-jest:
npm i jest ts-jest babel-jest
babel.config.js
(only used by jest)
module.exports = {presets: ['@babel/preset-env']}
jest.config.js
module.exports = {
preset: 'ts-jest',
transform: {
'^.+\\.(ts|tsx)?$': 'ts-jest',
"^.+\\.(js|jsx)$": "babel-jest",
}
};
package.json
"scripts": {
"test": "jest"