How to set an Alias in AVA tests

Question

I'm trying to set alias globally in my project without using Webpack, Babel, etc. Right now I have a simple test with AVA .

I'm using module-alias npm package that let me set in package.json my aliases. However, when I try to just create a simple example following the documentation with a basic alias it doesn't find the file:

Error: Cannot find module '@root/my-module.js'

You can reproduce this example with these 3 files:

package.json

{
  "name": "ava-alias",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "ava"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "ava": "^2.4.0",
    "esm": "^3.2.25",
    "module-alias": "^2.2.2"
  },
  "ava": {
    "require": [
      "esm",
      "module-alias"
    ]
  },
  "_moduleAliases": {
    "@root": "."
  }
}

test.js

require('module-alias/register')

import test from 'ava'
//import cube from './my-module.js'  // working
import cube from '@root/my-module.js' // not working

test('cube of 3 is 27', t => {
    t.is(cube(3), 27)
})

my-module.js

export default function cube(x) {
  return x * x * x
}

Save these files to an empty folder and then in that path in your terminal: npm i && npm run test

Maybe I'm missing same basics, thank you so much for time and help!

Answer 1

I ran into this same issue. You can solve this by using module-alias/register inside your Ava config.

Your package.json should look like:

{
  "name": "ava-alias",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "ava"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "ava": "^2.4.0",
    "esm": "^3.2.25",
    "module-alias": "^2.2.2"
  },
  "ava": {
    "require": [
      "esm",
      "module-alias/register"
    ]
  },
  "_moduleAliases": {
    "@root": "."
  }
}