[BUG] pathsToModuleNameMapper prefix wrong path resolve

[MaxmaxmaximusAWS]

jest.config.js:

const { pathsToModuleNameMapper } = require('ts-jest/utils');
const { compilerOptions } = require('./tsconfig');

pathsToModuleNameMapper(compilerOptions.paths, { prefix: compilerOptions.baseUrl } )

tsconfig.json:

{
  "compilerOptions": {
    "baseUrl": "src",
    "paths": {
      "components/*": ["components/*"]
    }
  },
}

pathsToModuleNameMapper compiles to:

{
  '^components/(.*)$': 'srccomponents/$1'
}

but must be:

{
  '^components/(.*)$': '.src/components/$1'
}

Solution:

you need to normalize the path first:

const path = require('path')

function pathsToModuleNameMapper (childPath, {prefix}){
  // const totalPath = prefix + childPath; its WRONG
  const totalPath = path.join(prefix, childPath); // its GOOD
}

[ahnpnl]

PR is welcome :) We plan to have a new release soon so if you can quickly make the Pr, it can be included in the release.

[splincode]

@ahnpnl my tests recently crashed and now I can't fix this
#1982

[its-dibo]

I have this issue for the following tsconfig

"paths": {
      "@pkg/*": ["./packages/*"]
    }

pathsToModuleNameMapper resolves paths wrongly

in jest config:

//jest.config.js

console.log([
   pathsToModuleNameMapper(
    compilerOptions.paths 
  ),


   pathsToModuleNameMapper(compilerOptions.paths, {
    prefix: compilerOptions.baseUrl,
  }),

   pathsToModuleNameMapper(compilerOptions.paths, {
    prefix: "<rootDir>/",
  ])

results in:

[
  {"^@pkg/.*$": "./packages/$1" },
  {"^@pkg/.*$": "././packages/$1" },
  {"^@pkg/.*$": "<rootDir>./packages/$1" },

]

all of them are wrong, but the correct value is

  {"^@pkg/.*$": "<rootDir>/packages/$1*" },

the first one gives a relative value to the file that requested the module, but it must be relative to compilerOptions.baseUrl
the second one is totally wrong
the third one just concatenates <rootDir> with ./packages/$1 instead of resolving them