ts-jest: 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 :
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"24.0.0"},"message":"creating jest presets not handling JavaScript files","sequence":1,"time":"2019-03-13T22:22:59.064Z"}
{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","version":"24.0.0"},"message":"creating Importer singleton","sequence":2,"time":"2019-03-13T22:23:00.323Z"}
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"24.0.0"},"message":"creating jest presets not handling JavaScript files","sequence":3,"time":"2019-03-13T22:23:00.326Z"}
{"context":{"actualVersion":"24.5.0","expectedVersion":">=24 <25","logLevel":20,"namespace":"versions","package":"ts-jest","version":"24.0.0"},"message":"checking version of jest: OK","sequence":4,"time":"2019-03-13T22:23:00.327Z"}
{"context":{"baseOptions":{},"logLevel":20,"namespace":"jest-transformer","package":"ts-jest","transformerId":1,"version":"24.0.0"},"message":"created new transformer","sequence":5,"time":"2019-03-13T22:23:00.327Z"}
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{"context":{"logLevel":30,"namespace":"jest-transformer","package":"ts-jest","transformerId":1,"version":"24.0.0"},"message":"no matching config-set found, creating a new one","sequence":7,"time":"2019-03-13T22:23:00.328Z"}
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{"context":{"logLevel":20,"namespace":"config","package":"ts-jest","transformerId":1,"tsJestConfig":{"compiler":"typescript","diagnostics":{"ignoreCodes":[6059,18002,18003],"pretty":true,"throws":true},"isolatedModules":false,"transformers":[],"tsConfig":{"kind":"file"}},"version":"24.0.0"},"message":"normalized ts-jest config","sequence":10,"time":"2019-03-13T22:23:00.330Z"}
{"context":{"logLevel":20,"namespace":"config","package":"ts-jest","transformerId":1,"version":"24.0.0"},"message":"babel is disabled","sequence":11,"time":"2019-03-13T22:23:00.331Z"}
{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","requireResult":{"exists":true,"given":"typescript","path":"/Users/david/dev/ts-test-jest/node_modules/typescript/lib/typescript.js"},"version":"24.0.0"},"message":"loaded module typescript","sequence":12,"time":"2019-03-13T22:23:00.598Z"}
{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","version":"24.0.0"},"message":"patching typescript","sequence":13,"time":"2019-03-13T22:23:00.598Z"}
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{"context":{"logLevel":20,"namespace":"config","package":"ts-jest","transformerId":1,"tsConfigFileName":"/Users/david/dev/ts-test-jest/tsconfig.json","version":"24.0.0"},"message":"readTsConfig(): reading /Users/david/dev/ts-test-jest/tsconfig.json","sequence":15,"time":"2019-03-13T22:23:00.599Z"}
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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

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 14
Comments: 18

Most upvoted comments

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.

+26

grainrigi on Apr 7, 2020

Just in case anyone also has this problem: I kept getting an error SyntaxError: Unexpected token ' in JSON at position 0 when running the script. Rewriting it to this fixed it for me:

ts-node -O \"{\\\"module\\\":\\\"commonjs\\\"}\" node_modules/jest/bin/jest.js

This was not my idea. See here: https://github.com/TypeStrong/ts-node/issues/313#issuecomment-741249846

LeonhWolf on Jan 4, 2023

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.

TheJizel on Jul 8, 2020

Same here

dortamiguel on Mar 21, 2019