Is there a way to convert a typescript alias path to the Jest 'moduleNameMapper' when the alias is for a specific file?

I am currently working on setting up Jest in a TypeScript project.

In our tsconfig.json file, we are using path aliases like so:

"baseUrl": ".",
"paths": {
  "@eddystone-shared/*": [ "../shared/*" ],
  "@eddystone-firebase-helpers/*": [ "src/helpers/firebase-helpers/*" ],
  "@eddystone-func-config": ["src/config/config"],

These aliases function as follows:

  1. Referencing all files in the parent directory.
  2. Referencing all files in the src subdirectory.
  3. Referencing one specific file.

I have come across information on Jest's GitHub stating that the Jest moduleNameMapper is the configuration to use for this. I have attempted to convert it like this:

"moduleNameMapper": {
  "^@eddystone-shared/(.*)$": "<rootDir>../shared/$1",
  "^@eddystone-firebase-helpers/(.*)$": "<rootDir>/src/helpers/firebase-helpers/$1",
  "^@eddystone-func-config/(.*)$": "<rootDir>/src/config/config",

However, I am encountering issues specifically with the @eddystone-func-config alias. So, my question is: How can I create a moduleNameMapper entry for a specific file?

typescriptjestjs

Answer №1

One method to streamline your configuration is by using the jest-module-name-mapper package. This tool automatically generates the moduleNameMapper config based on the contents of your tsconfig.json.

According to the documentation, all you need to do is configure your jest.config.js file like this:

module.exports = {
  ...
  moduleNameMapper: require('jest-module-name-mapper')(),
};

If you're encountering issues with your config, it's possible that the regex "

"^@eddystone-func-config/(.*)$"
" may be causing confusion. The function should be imported as "@eddystone-func-config", but the regex does not properly match this name. The /(.*) portion is unnecessary since @eddystone-func-config is not a directory.

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