@lwc/jest-transformer

lwc-jest-transformer

Compile LWC and engine for Jest tests

Requirements

• Node 8.x
• NPM 5.x
• Yarn >= 1.0.0
• lwc-compiler >= 0.17.0

Prerequisites

• lwc-compiler must be installed in the project.

• You may also want to install jest globally to run tests directly from the command line:

  yarn global add jest

Installation

yarn add -D lwc-jest-transformer

Usage

1. Update your jest config to point the transformer to this package.

{
  "jest": {
    "moduleFileExtensions": [
      "js",
      "html"
    ],
    "transform": {
      "^.+\\.(js|html)$": "lwc-jest-transformer"
    }
  }
}

1. Update moduleNameMapper to point to where your LWC modules reside in the project.
2. Follow steps 4 through 6 of Option A.