ts-jest: Compiler options not working as expected when using project references

Issue :

Expected behavior :

I have three TS projects:

tsconfig-src.json
tsconfig-tests.json
tsconfig.json which references both of the above (using TypeScript’s new “project references” feature)

When running jest, it should read compiler options from tsconfig.json.

Because tsconfig.json includes no files for itself but just references other projects, ts-jest should read its compiler options from the project reference that corresponds to any given file.

For example, tsconfig.json references the tsconfig-tests.json project:

{
  "references": [
    {
      "path": "./tsconfig-tests.json"
    }
  ]
}

In turn, tsconfig-tests.json includes all test files:

{
  "include": ["**/__tests__/**/*"]
}

Given this example, I expect any test file matching the tests TS project (tsconfig-tests.json, which includes **/__tests__/**/*) to use compiler options for that TS project.

Actual behaviour

Looking at the logs, I can see tsconfig.json is used. However, compilerOptions is read from tsconfig.json, not tsconfig-tests.json.

I have verified this:

When I add compiler options to tsconfig.json, ts-jest uses them.
When I add compiler options to tsconfig-tests.json, ts-jest does not use them.

Debug log:

log file content

# content of ts-jest.log :
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"23.10.1"},"message":"creating jest presets not handling JavaScript files","sequence":1,"time":"2018-09-26T16:17:30.904Z"}
{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","version":"23.10.1"},"message":"creating Importer singleton","sequence":2,"time":"2018-09-26T16:17:32.262Z"}
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"23.10.1"},"message":"creating jest presets not handling JavaScript files","sequence":3,"time":"2018-09-26T16:17:32.268Z"}
{"context":{"actualVersion":"23.6.0","expectedVersion":">=22 <24","logLevel":20,"namespace":"versions","package":"ts-jest","version":"23.10.1"},"message":"checking version of jest: OK","sequence":4,"time":"2018-09-26T16:17:32.271Z"}
{"context":{"baseOptions":{},"logLevel":20,"namespace":"jest-transformer","package":"ts-jest","transformerId":1,"version":"23.10.1"},"message":"created new transformer","sequence":5,"time":"2018-09-26T16:17:32.271Z"}
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{"context":{"logLevel":30,"namespace":"jest-transformer","package":"ts-jest","transformerId":1,"version":"23.10.1"},"message":"no matching config-set found, creating a new one","sequence":7,"time":"2018-09-26T16:17:32.275Z"}
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Minimal repo :

Full reproduction case

In the full reproduction case I have created, you will see that running tsc -b -f tsconfig.json has no problems, but running jest fails with:

 FAIL  src/__tests__/add.ts
  ● Test suite failed to run

    TypeScript diagnostics (customize using `[jest-config].globals.ts-jest.diagnostics` option):
    src/add.ts:1:8 - error TS1192: Module '"/Users/OliverJAsh/Development/temp/jest-ts-project-references/node_modules/@types/lodash/add"' has no default export.

    1 import add from 'lodash/add';
             ~~~

This failure suggests that the allowSyntheticDefaultImports compiler option, used in tsconfig-tests.json, is not picked up.

About this issue

Original URL
State: closed
Created 6 years ago
Reactions: 23
Comments: 36 (6 by maintainers)

Links to this issue

angular - Using Jest I get: Cannot find type definition file for 'jasmine' - Stack Overflow

Most upvoted comments

the issue will be fixed by specifying the correct tsconfig for ts-jest to read. In this case, jest.config.js needs to be modified as

globals: {
    'ts-jest': {
        tsConfig: 'tsconfig-tests.json'
    },
},

This will tell ts-jest to use the correct tsconfig. Because by default without specifying tsConfig in ts-jest option, ts-jest will read root tsconfig.json.

ahnpnl on May 8, 2020

In my case Jest does not even tries to build the project references, it just fails with error:

 FAIL  src/foo.spec.ts
  ● Test suite failed to run

    Cannot find module 'web-modules-core' from 'foo.ts'

    However, Jest was able to find:
        './foo.spec.ts'
        './foo.ts'

    You might want to include a file extension in your import, or update your 'moduleFileExtensions', which is currently ['js', 'json', 'jsx', 'ts', 'tsx', 'node', 'ts', 'tsx'].

    See https://jestjs.io/docs/en/configuration#modulefileextensions-array-string

    > 1 | export {getConfig} from 'web-modules-core';
        | ^
      2 |

tsc -b works as expected though.

kirill-konshin on Sep 11, 2019

I used this code at jest.config.js to get rid of diagnostics error messages

"jest": {
    "globals": {
      "ts-jest": {
        "diagnostics": {
          "warnOnly": true
        }
      }
    }
  }

This information helped me a lot https://huafu.github.io/ts-jest/user/config/diagnostics

zenby on Jan 7, 2019

Can you upgrade the minimal repo’s master

The original repro is on the ts-jest-issue branch.

Be sure to upgrade ts-jest

The upgraded repro is on the ts-jest-issue-upgrade branch. I have checked yarn.lock and it’s definitely upgraded.

makes jest fail while tsc pass

tsc does pass and jest fails, as per my original description.

Passes:

$ tsc -b -f tsconfig.json

Fails:

$ jest
 FAIL  src/__tests__/add.ts
  ● Test suite failed to run

    TypeScript diagnostics (customize using `[jest-config].globals.ts-jest.diagnostics` option):
    src/add.ts:1:8 - error TS1192: Module '"/Users/OliverJAsh/Development/temp/jest-ts-project-references/node_modules/@types/lodash/add"' has no default export.

    1 import add from 'lodash/add';
             ~~~

OliverJAsh on Sep 27, 2018

It seems like when resolving import x from 'y', the references:[] in tsconfig is not working.

My test case is removing the built artifacts (i.e. dist or lib and *.tsbuildinfo), and then try to run jest.

The error is Cannot find module 'y'.

tsc -b is working fine.

unional on May 14, 2019

Any updates or RIP?

milichev on Dec 20, 2018

Arrrrrrgg wrong button, sorry!

huafu on Sep 27, 2018

I know this is an old issue, but if anyone else is running into similar problems… I just made this on Jest config and it worked for me:

  globals: {
    'ts-jest': {
      isolatedModules: true,
    },
  }

alexbruno on Aug 1, 2022

You have to use moduleNameMapper. If you are using jest projects and typescript references, then your typescript paths are based on the baseUrl, but the jest paths are based on where the jest.config is located for that project. So if you have a tsconfig.json with paths defined at the root level and "baseUrl": ".", and a jest config at /packages/example/jest.config.js, then your jest rootdir is at /packages/example and the typescript baseUrl is at /. So instead of:

{ '^@example/prefix\\-(.*)$': '<rootDir>/packages/$1' }

Your actual path is:

{ '^@example/prefix\\-(.*)$': '<rootDir>/../$1' }

This can be calculated via:

const tsConfigPaths = require('tsconfig-paths')
const { pathsToModuleNameMapper } = require('ts-jest/utils');
const { join, dirname, relative } = require('path');

function tsPathsToJestPaths(tsConfigPath) {
  const tsConfigPathsResult = tsConfigPaths.loadConfig(tsConfigPath);
  const paths = tsConfigPathsResult.paths;
  const absolutePaths = Object.keys(paths).reduce((result, moduleName) => {
    result[moduleName] = paths[moduleName].map((path) => {
      const mappedPath = relative(dirname(tsConfigPath), join(dirname(tsConfigPath), tsConfigPathsResult.baseUrl, path))
      return `<rootDir>/${mappedPath}`;
    });
    return result;
  }, {})
  return pathsToModuleNameMapper(absolutePaths)
}

where tsConfigPath is the absolute path to your tsconfig, i.e. resolve(__dirname, "tsconfig.json")

Perhaps ts-jest can automatically do this based on globals.ts-jest.tsConfig

jdolle on Oct 3, 2019

I got my mono-repo to compile on jest run without having to build files by using moduleNameMapper with typescript project references, etc.

j on Aug 24, 2019

@zenby’s solution works, but it’s the “nuclear” option. To avoid those "Module 'foo' has no default export." errors, just do this:

globals: {
  "ts-jest": {
    "diagnostics": {          
      "ignoreCodes": "TS1192" 
    }
  }
}

lonix1 on Jan 24, 2019

@OliverJAsh can you come over ts-jest slack? https://bit.ly/ts-jest-slack

huafu on Sep 27, 2018

Can you upgrade the minimal repo’s master adding an option that makes jest fail while tsc pass?

Be sure to upgrade ts-jest (personally I git clone ..., yarn and then yarn add --dev ts-jest@latest

huafu on Sep 27, 2018