Jest gives `Cannot find module` when importing components with absolute paths - node.js

Question

Receiving the following error when running Jest
Cannot find module 'src/views/app' from 'index.jsx'
at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:179:17)
at Object.<anonymous> (src/index.jsx:4:12)
index.jsx
import AppContainer from 'src/views/app';
package.json
"jest": {
"collectCoverageFrom": [
"src/**/*.{js,jsx,mjs}"
],
"setupFiles": [
"<rootDir>/config/polyfills.js"
],
"testMatch": [
"<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}",
"<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}"
],
"testEnvironment": "node",
"testURL": "http://localhost",
"transform": {
"^.+\\.(js|jsx|mjs)$": "<rootDir>/node_modules/babel-jest",
"^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
"^(?!.*\\.(js|jsx|mjs|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
},
"transformIgnorePatterns": [
"[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"
],
"moduleDirectories": [
"node_modules",
"src"
],
"moduleNameMapper": {
"^react-native$": "react-native-web"
},
"moduleFileExtensions": [
"web.js",
"js",
"json",
"web.jsx",
"jsx",
"node",
"mjs"
]
},
My tests that run files that only contain relative paths in the tree run correctly.
To Clarify, I'm looking for how to configure Jest to not fail on absolute paths.

Answer 1

I think you're looking for: roots or modulePaths and moduleDirectories
You can add both relative and absolute paths.
I would make sure to include <rootDir> in the roots array, <rootDir> in the modulePaths array, and node_modules in the moduleDirectories array, unless you've got a good reason to exclude them.
"jest": {
"roots": [
"<rootDir>",
"/home/some/path/"
],
"modulePaths": [
"<rootDir>",
"/home/some/other/path"
],
"moduleDirectories": [
"node_modules"
],
}

Answer 2

Since in package.json you have:
"moduleDirectories": [
"node_modules",
"src"
]
Which says that each module you import will be looked into node_modules first and if not found will be looked into src directory.
Since it's looking into src directory you should use:
import AppContainer from 'views/app';
Please note that this path is absolute to the src directory, you do not have to navigate to locate it as relative path.
OR you can configure your root directory in moduleDirectories inside your pakcage.json so that all your components could be imported as you want it.

Answer 3

Adding
"moduleDirectories": [
"node_modules",
"src"
]
should work if you have Jest's config in your package.json file.
If you have a jest.config.js file, you should add it there, otherwise package.json will be overriden (and ignored) by this config file. So in your jest.config.js file:
module.exports = {
// ... lots of props
moduleDirectories: ["node_modules", "src"],
// ...
}

Answer 4

That's because jest doesn't recognize relative imports like src/views/app
Add a rootDir and a modulePaths in package.json
"name": "my-app",
...
"jest": {
...
"rootDir": "./",
"modulePaths": [
"<rootDir>"
],
...
}
}

Answer 5

Make sure you have run npm i or npm install after update the package.json. My issue was that :0

Answer 6

For those who are building something from scratch with Webpack and Babbel.
Try the following steps:
Delete the node_modules folder and install again. (This was something that solved my issue).
Here is a link with the necessary documentation to set up Webpack which in some cases will not be necessary. Jest Docs Webpack
Here is a link to the docs that explains how to set up Jest with React (Without using Create-React-App). Jest React Docs
4. Here is an example with a simple setup with Jest. You can set this up in package.json or the Jest configuration file.
Disclaimer: This does not answer the OP question. But most people will end up here for the keywords used for this issue.
"jest": {
"moduleFileExtensions": ["js", "jsx"],
"moduleDirectories": ["node_modules"],
"moduleNameMapper": {
"\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
"\\.(css|less)$": "<rootDir>/__mocks__/styleMock.js"
}
},

Answer 7

In my case, I was running integration tests and all tests were in the same file with the path src/int-test.spec.ts in order to read paths I had to write:
"jest": {
...,
"moduleNameMapper": {
"src/(.*)": "<rootDir>/$1"
}
}

Answer 8

Adding __esModule:true fixed this issue for me.
jest.mock('module',()=>({
__esModule: true, // this makes it work
default: jest.fn()
}));
Hope this helps somebody. Although this is not very specific to the question.

Answer 9

This can also be caused by absolute imports present in the globalSetup file (or any files it references).
It seems like moduleNameMappers do not get applied to globalSetup files. I fixed this by just switching to relative imports for those specific files.

Answer 10

This Workaround:
Using "moduleNameMapper" in your jest configuration will make test-resolve work as expected:
"jest": {
"moduleNameMapper": {
"#(.*)": "<rootDir>/node_modules/$1"
}
}
https://gist.github.com/lydell/d62ce96c95c035811133a5396195da14

Answer 11

One of the modules I wanted to use has a .cjs extension.
Adding .cjs to moduleFileExtensions in jest.config.js fixed this problem for me.
My jest.config.js as example:
module.exports = {
moduleNameMapper: {
// see: https://github.com/kulshekhar/ts-jest/issues/414#issuecomment-517944368
"^#/(.*)$": "<rootDir>/src/$1",
},
preset: "ts-jest/presets/default-esm",
globals: {
"ts-jest": {
useESM: true,
},
},
testEnvironment: 'jsdom',
transform: {
'^.+\\.vue$': 'vue3-jest',
},
moduleFileExtensions: ['json', 'js', 'jsx', 'ts', 'tsx', 'vue', "cjs"],
moduleDirectories: ["node_modules"],
};

Answer 12

Just add "modulePaths" to your package.json
"jest": {
...
"modulePaths": [
"<rootDir>"
],
...
}
}

Answer 13

I had jest-expo installed, but not jest. Probably related that I'm prebuild-ejected from Expo. I had to run yarn add jest-expo jest to install jest, and updated jest-expo. Now my tests run.
Depending on your setup it might be, npm i jest-expo jest or expo install jest-expo jest. ... Got the idea from their docs https://docs.expo.dev/guides/testing-with-jest/