Issue with rewire "Cannot find module"

Issue

I’m unable to use rewire with ts-jest, it seems to works with .js files, but it does not with .ts files as supposed to.

Expected behavior

Being able to rewire a module with jest with ts-jest.

Debug log:

content of ts-jest.log

# content of ts-jest.log :
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Minimal repo

https://github.com/DavidBabel/test-jest-rewire-typescript

git clone https://github.com/DavidBabel/test-jest-rewire-typescript
yarn & jest

[grainrigi]

I had the same issue on using rewire with ts-jest on Node.js and found a solution.

Solution

Use ts-node alongside ts-jest.

Example:

Install ts-node.

$ npm i -D ts-node

Rewrite package.json.

  "scripts": {
    ...
-   "test": "jest",
+   "test": "ts-node -O '{\"module\":\"commonjs\"}' node_modules/jest/bin/jest.js",
    ...
  },

Run test as usual.

$ npm t

And everything goes well!

Explanation

rewire uses module module(can be used by require('module')), which ts-jest does not wrap. Therefore, rewire resolves the module you importing without typescript functionality, only searching for the file with .js extension. This results in Cannot find module error since the target *.js file does not exist.

ts-node hooks the node.js’s native module resolution functionality so we can resolve module with .ts extension with module module, which rewire relies on. -O '{\"module\":\"commonjs\"}' option is needed only if you don’t have the same configuration in your tsconfig.json.

[TheJizel]

Just want to leave a comment here in case anybody else using WebStorm with a Jest run configuration happens to be looking for a fix.

I can confirm that @grainrigi’s solution of adding ts-node to the script works. However, a Jest run configuration in WebStorm needs to be resolved separately. You could, of course, create a npm run configuration and simply run your test script. However, you lose the nice UI for test results that the IDE provides (even if you use the --coverage flag, which is better but still not as clean in my opinion).

Fortunately, you can simply add --require ts-node/register to the “Node options” in your configuration and this should solve the problem there.

I suspect this would also work for IntelliJ, but haven’t tested it personally.