flatMap is not a function

🐛 Bug Report

environment:

• node v10.20.1
• nextjs v9.3.5
• jest 26.1.0
• ts-jest 26.1.3

configs:

// .babelrc
{
    "presets": ["next/babel"],
    "plugins": ["babel-plugin-styled-components"]
}

// jest.config.js

module.exports = {
  clearMocks: true,
  moduleFileExtensions: [
    "js",
    "json",
    //   "jsx",
    "ts",
    "tsx",
    //   "node"
  ],
  preset: "ts-jest",
  testPathIgnorePatterns: ["./.next/", "/node_modules/"],
};

// tsconfig.json
{
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    "target": "es5",
    "downlevelIteration": true,
    "importHelpers": true,
    "lib": ["dom", "dom.iterable", "es2019"],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react"
  },
  "exclude": ["node_modules", "out", "public", "static"]
}

Cannot run tests that use flatMap.

To Reproduce

Steps to reproduce the behavior:

• Use flatmap in a test.

Expected behavior

• works

Link to repo (highly encouraged)

https://gitlab.com/robotandkid/app-exploding-dogs/-/tree/test/ts-jest

Debug log:

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[ahnpnl]

More information: https://github.com/Microsoft/TypeScript/issues/20095 Apparently TypeScript doesn’t automatically polyfill so yes it’s different from Babel.

To opt-in polyfills you can follow this https://github.com/kulshekhar/ts-jest/issues/828#issuecomment-433976880

[frankandrobot]

i don’t understand… isn’t ts-jest supposed to transpile the code similar to babel? es2019 is in the tsconfig file.