karma-es6-transpiler-preprocessor

0.0.1 verified Fri May 01 auth: no javascript deprecated

A Karma preprocessor that transpiles ES6 JavaScript code to ES5 using es6-transpiler. Version 0.0.1, last updated in 2014. This package is essentially abandoned; es6-transpiler is no longer maintained, and modern projects should use Babel or TypeScript instead. It works only with Karma and requires no direct dependencies but relies on es6-transpiler being installed (though not listed as a peer dependency).

Common errors

error Error: Module "es6-transpiler" not found ↓

cause es6-transpiler is not installed.

fix

Run 'npm install es6-transpiler --save-dev'

error No provider for "preprocessor:es6-transpiler"! ↓

cause Preprocessor setup is incorrect or missing.

fix

Ensure preprocessors key uses array format: '*.js': ['es6-transpiler']

Warnings

deprecated es6-transpiler is no longer maintained. Consider using Babel or TypeScript instead. ↓

fix Replace with karma-babel-preprocessor or @karma-typescript

gotcha The preprocessors value must be an array, not a string. Misconfiguration leads to silent failure. ↓

fix Ensure preprocessor values are arrays: ['es6-transpiler']

gotcha es6-transpiler is not automatically installed as a dependency; you must install it separately. ↓

fix Run 'npm install es6-transpiler --save-dev' in addition to this preprocessor

Install

npm install karma-es6-transpiler-preprocessor

yarn add karma-es6-transpiler-preprocessor

pnpm add karma-es6-transpiler-preprocessor

Imports

config.set({ preprocessors: { ... } })

wrong

module.exports = function(config) { config.set({ preprocessors: { '*.js': 'es6-transpiler' } }); };

correct

module.exports = function(config) { config.set({ preprocessors: { '*.js': ['es6-transpiler'] } }); };

Preprocessors value must be an array, not a string.

Quickstart

Shows how to configure Karma to use the es6-transpiler preprocessor for all JS files in source and spec directories.

// karma.conf.js
module.exports = function(config) {
  config.set({
    basePath: '',
    frameworks: ['jasmine'],
    files: ['src/**/*.js', 'spec/**/*.spec.js'],
    preprocessors: {
      'src/**/*.js': ['es6-transpiler'],
      'spec/**/*.spec.js': ['es6-transpiler']
    },
    browsers: ['ChromeHeadless'],
    singleRun: true
  });
};