ts-jest does not support new Babel 7 Project-wide config file

Issue :

Babel 7’s Project-wide config file is named babel.config.js, implying it is a JavaScript file, but ts-jest uses json5.parse(readFileSync(babelConfig.value, 'utf8')) to parse the config. This results in an error, because our JavaScript configuration cannot be parsed as JSON.

Expected behavior :

The JavaScript file would be able to be parsed as a babel project-wide configuration. ts-jest’s docs also suggest that JS files are acceptable.

Debug log:

log file content

# content of ts-jest.log :

{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","version":"23.10.5"},"message":"creating Importer singleton","sequence":1,"time":"2019-01-04T22:19:32.262Z"}
{"context":{"allowJs":false,"logLevel":20,"namespace":"jest-preset","package":"ts-jest","version":"23.10.5"},"message":"creating jest presets not handling JavaScript files","sequence":2,"time":"2019-01-04T22:19:32.268Z"}
{"context":{"actualVersion":"23.6.0","expectedVersion":">=22 <24","logLevel":20,"namespace":"versions","package":"ts-jest","version":"23.10.5"},"message":"checking version of jest: OK","sequence":3,"time":"2019-01-04T22:19:32.271Z"}
{"context":{"baseOptions":{},"logLevel":20,"namespace":"jest-transformer","package":"ts-jest","transformerId":1,"version":"23.10.5"},"message":"created new transformer","sequence":4,"time":"2019-01-04T22:19:32.272Z"}
{"context":{"fileName":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/src/dummy.tests.ts","logLevel":20,"namespace":"jest-transformer","package":"ts-jest","transformOptions":{"instrument":false,"rootDir":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo"},"transformerId":1,"version":"23.10.5"},"message":"computing cache key for /Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/src/dummy.tests.ts","sequence":5,"time":"2019-01-04T22:19:32.273Z"}
{"context":{"logLevel":30,"namespace":"jest-transformer","package":"ts-jest","transformerId":1,"version":"23.10.5"},"message":"no matching config-set found, creating a new one","sequence":6,"time":"2019-01-04T22:19:32.273Z"}
{"context":{"config":{"automock":false,"browser":false,"cache":true,"cacheDirectory":"/var/folders/31/qs9vmhyd09g85lkk1ktcz5tw0000gn/T/jest_dx","clearMocks":false,"coveragePathIgnorePatterns":["/node_modules/"],"cwd":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo","detectLeaks":false,"detectOpenHandles":false,"errorOnDeprecated":false,"filter":null,"forceCoverageMatch":[],"globals":{"ts-jest":{"babelConfig":"babel.config.js"}},"haste":{"providesModuleNodeModules":[]},"moduleDirectories":["node_modules"],"moduleFileExtensions":["js","jsx","json","ts","tsx","d.ts"],"moduleNameMapper":[],"modulePathIgnorePatterns":[],"name":"6ed986b4806ca7fc593176c5d57d2dee","prettierPath":null,"resetMocks":false,"resetModules":false,"resolver":null,"restoreMocks":false,"rootDir":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo","roots":["/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo"],"runner":"jest-runner","setupFiles":[],"setupTestFrameworkScriptFile":null,"skipFilter":false,"snapshotSerializers":[],"testEnvironment":"jest-environment-jsdom","testEnvironmentOptions":{},"testLocationInResults":false,"testMatch":["**/__tests__/**/*.js?(x)","**/?(*.)(spec|test).js?(x)","**/tests.(js|jsx|ts|tsx)","**/*.tests.(js|jsx|ts|tsx)"],"testPathIgnorePatterns":["/node_modules/"],"testRegex":"","testRunner":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/node_modules/jest-jasmine2/build/index.js","testURL":"http://localhost","timers":"real","transform":[[".(js|jsx|ts|tsx)","/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/node_modules/ts-jest/dist/index.js"]],"transformIgnorePatterns":["/node_modules/"],"watchPathIgnorePatterns":[]},"logLevel":20,"namespace":"backports","package":"ts-jest","transformerId":1,"version":"23.10.5"},"message":"backporting config","sequence":7,"time":"2019-01-04T22:19:32.273Z"}
{"context":{"jestConfig":{"automock":false,"browser":false,"cache":true,"cacheDirectory":"/var/folders/31/qs9vmhyd09g85lkk1ktcz5tw0000gn/T/jest_dx","clearMocks":false,"coveragePathIgnorePatterns":["/node_modules/"],"cwd":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo","detectLeaks":false,"detectOpenHandles":false,"errorOnDeprecated":false,"filter":null,"forceCoverageMatch":[],"globals":{"ts-jest":{"babelConfig":"babel.config.js"}},"haste":{"providesModuleNodeModules":[]},"moduleDirectories":["node_modules"],"moduleFileExtensions":["js","jsx","json","ts","tsx","d.ts"],"moduleNameMapper":[],"modulePathIgnorePatterns":[],"name":"6ed986b4806ca7fc593176c5d57d2dee","prettierPath":null,"resetMocks":false,"resetModules":false,"resolver":null,"restoreMocks":false,"rootDir":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo","roots":["/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo"],"runner":"jest-runner","setupFiles":[],"setupTestFrameworkScriptFile":null,"skipFilter":false,"snapshotSerializers":[],"testEnvironment":"jest-environment-jsdom","testEnvironmentOptions":{},"testLocationInResults":false,"testMatch":["**/__tests__/**/*.js?(x)","**/?(*.)(spec|test).js?(x)","**/tests.(js|jsx|ts|tsx)","**/*.tests.(js|jsx|ts|tsx)"],"testPathIgnorePatterns":["/node_modules/"],"testRegex":"","testRunner":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/node_modules/jest-jasmine2/build/index.js","testURL":"http://localhost","timers":"real","transform":[[".(js|jsx|ts|tsx)","/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/node_modules/ts-jest/dist/index.js"]],"transformIgnorePatterns":["/node_modules/"],"watchPathIgnorePatterns":[]},"logLevel":20,"namespace":"config","package":"ts-jest","transformerId":1,"version":"23.10.5"},"message":"normalized jest config","sequence":8,"time":"2019-01-04T22:19:32.273Z"}
{"context":{"fromPath":"babel.config.js","logLevel":20,"namespace":"config","package":"ts-jest","toPath":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/babel.config.js","transformerId":1,"version":"23.10.5"},"message":"resolved path from babel.config.js to /Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/babel.config.js","sequence":9,"time":"2019-01-04T22:19:32.274Z"}
{"context":{"logLevel":20,"namespace":"config","package":"ts-jest","transformerId":1,"tsJestConfig":{"babelConfig":{"kind":"file","value":"/Users/rehkugler/Documents/Development/ts-jest-babel-7-project-wide-config-repro-repo/babel.config.js"},"compiler":"typescript","diagnostics":{"ignoreCodes":[6059,18002,18003],"pretty":true,"throws":true},"isolatedModules":false,"transformers":[],"tsConfig":{"kind":"file"}},"version":"23.10.5"},"message":"normalized ts-jest config","sequence":10,"time":"2019-01-04T22:19:32.275Z"}

Minimal repo :

https://github.com/paulrehkugler/ts-jest-babel-7-project-wide-config-repro-repo

[liamjones]

The way I’ve been working around this for now is by using the new jest.config.js format and inlining the babel.config.js via a require:

// jest.config.js
module.exports = {
    globals: {
        'ts-jest': {
            babelConfig: require('./babel.config.js')
        }
    }
}

[ntucker]

Please release a new version