vue-jest

Jest Vue transformer with source map support

NOTE: This is documentation for vue-jest@3.x. View the vue-jest@2.x documentation

Usage

npm install --save-dev vue-jest

Setup

To define vue-jest as a transformer for your .vue files, map them to the vue-jest module:

{
  "jest": {
    "transform": {
      "^.+\\.vue$": "vue-jest"
    }
}

A full config will look like this.

{
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "vue"
    ],
    "transform": {
      "^.+\\.js$": "babel-jest",
      "^.+\\.vue$": "vue-jest"
    }
  }
}

If you're on a version of Jest older than 22.4.0, you need to set mapCoverage to true in order to use source maps.

Example Projects

Example repositories testing Vue components with jest and vue-jest:

• Avoriaz with Jest
• Vue Test Utils with Jest

Supported langs

vue-jest compiles the script and template of SFCs into a JavaScript file that Jest can run. Currently, SCSS, SASS and Stylus are the only style languages that are compiled.

Supported script languages

• typescript (lang="ts", lang="typescript")
• coffeescript (lang="coffee", lang="coffeescript")

Global Jest options

You can change the behavior of vue-jest by using jest.globals.

Tip: Need programmatic configuration? Use the --config option in Jest CLI, and export a .js file

babelConfig

Provide babelConfig in one of the following formats:

• <Boolean>
• <Object>
• <String>

Boolean

• true - Enable Babel processing. vue-jest will try to find Babel configuration using find-babel-config.

This is the default behavior if babelConfig is not defined.

• false - Skip Babel processing entirely:

{
  "jest": {
    "globals": {
      "vue-jest": {
        "babelConfig": false
      }
    }
  }
}

Object

Provide inline Babel options:

{
  "jest": {
    "globals": {
      "vue-jest": {
        "babelConfig": {
          "presets": [
            [
              "env",
              {
                "useBuiltIns": "entry",
                "shippedProposals": true
              }
            ]
          ],
          "plugins": [
            "syntax-dynamic-import"
          ],
          "env": {
            "test": {
              "plugins": [
                "dynamic-import-node"
              ]
            }
          }
        }
      }
    }
  }
}

String

If a string is provided, it will be an assumed path to a babel configuration file (e.g. .babelrc, .babelrc.js).

• Config file should export a Babel configuration object.
• Should not point to a project-wide configuration file (babel.config.js), which exports a function.

{
  "jest": {
    "globals": {
      "vue-jest": {
        "babelConfig": "path/to/.babelrc.js"
      }
    }
  }
}

To use the Config Function API, use inline options instead. i.e.:

{
  "jest": {
    "globals": {
      "vue-jest": {
        "babelConfig": {
          "configFile": "path/to/babel.config.js"
        }
      }
    }
  }
}

tsConfig

Provide tsConfig in one of the following formats:

• <Boolean>
• <Object>
• <String>

Boolean

• true - Process TypeScript files using custom configuration. vue-jest will try to find TypeScript configuration using tsconfig.loadSync.

This is the default behavior if tsConfig is not defined.

• false - Process TypeScript files using the default configuration provided by vue-jest.

Object

Provide inline TypeScript compiler options:

{
  "jest": {
    "globals": {
      "vue-jest": {
        "tsConfig": {
          "importHelpers": true
        }
      }
    }
  }
}

String

If a string is provided, it will be an assumed path to a TypeScript configuration file:

{
  "jest": {
    "globals": {
      "vue-jest": {
        "tsConfig": "path/to/tsconfig.json"
      }
    }
  }
}

Supported template languages

• pug (lang="pug")

  • To give options for the Pug compiler, enter them into the Jest configuration. The options will be passed to pug.compile().

    {
      "jest": {
        "globals": {
          "vue-jest": {
            "pug": {
              "basedir": "mybasedir"
            }
          }
        }
      }
    }

• jade (lang="jade")

• haml (lang="haml")

Supported style languages

• stylus (lang="stylus", lang="styl")
• sass (lang="sass")
  • The SASS compiler supports jest's moduleNameMapper which is the suggested way of dealing with Webpack aliases.
• scss (lang="scss")

  • The SCSS compiler supports jest's moduleNameMapper which is the suggested way of dealing with Webpack aliases.

  • To import globally included files (ie. variables, mixins, etc.), include them in the Jest configuration at jest.globals['vue-jest'].resources.scss:

    {
      "jest": {
        "globals": {
          "vue-jest": {
            "resources": {
              "scss": [
                "./node_modules/package/_mixins.scss",
                "./src/assets/css/globals.scss"
              ]
            }
          }
        }
      }
    }

• postcss (lang="pcss", lang="postcss")

CSS options

experimentalCSSCompile: Boolean Default true. Turn off CSS compilation hideStyleWarn: Boolean Default false. Hide warnings about CSS compilation resources:

{
  "jest": {
    "globals": {
      "vue-jest": {
        "hideStyleWarn": true,
        "experimentalCSSCompile": true
      }
    }
  }
}