Cannot find module '@shelf/jest-mongodb'

I must be doing something stupid, but I can’t seem to resolve @shelf/jest-mongodb. Here’s a minimal repro:

$ npm i -D @shelf/jest-mongodb

$ echo "require('@shelf/jest-mongodb')" > test.js

$ node test.js

internal/modules/cjs/loader.js:626
    throw err;
    ^

Error: Cannot find module '@shelf/jest-mongodb'

At the same time,

$ cat node_modules/@shelf/jest-mongodb/package.json | grep name

    "name": "@shelf/jest-mongodb",

Any other package (incl. scoped) works. Originally ran into this with jest. I needs to use both ts-jest and @shelf/jest-mongodb, so I require both and then merge them with my own overwrites.

Env:

• node -v: v12.3.1
• npm -v: 6.9.0

[Borduhh]

Had a similar issue and like @alex996 said, all Jest presets are just JS objects. Therefore you can merge them. He chose to use the merge NPM package, but you can also just use the object spread notation.

Here is my jest.config.js file:

const tsPreset = require('ts-jest/jest-preset');
const mongoPreset = require('@shelf/jest-mongodb/jest-preset');

const jestOverwrites = {
  testMatch: ['**/src/tests/**/?(*.)+(spec|test).ts?(x)'],
};

module.exports = { ...tsPreset, ...mongoPreset, ...jestOverwrites };

[KnupMan]

Can you please explain why do you need to resolve it? If you wanna to use @shelf/jest-mongodb library properly, please look at the readme: https://github.com/shelfio/jest-mongodb#usage You just need to add the library as Jest preset: