ModRator

Use es6 modules from npm in webapps without transpiling.

Modrator is a tool class, to create a library out of the ES6 modules of node_modules to use them in web apps.

The problem

ES6 modules includes are always relative if the modules are not transpiled. So if you have a portion of the modules in /node_modules via npm and implement another portion under /src, the modules cannot link relatively.

The solution

Modrator solves the problem by copying the sources from node_modules to a web_modules folder, so that an include on external dependencies is always found under "../../web_modules", regardless of whether the code is in /src or /web_modules.

Usage

Modrator is mainly used in postinstall.js.

// Create an instance of `Modrator` in your `postinstall.js`:

const Modrator = require("modrator")
const modrator = new Modrator()

// Then add modules from packages

modrator.addToLibrary("npm-package-name-1")
modrator.addToLibrary("npm-package-name-2")
// [..]

The module sources will be copied from the node_modules to the lib folder for easy handling of the relative include path from es6 modules.

Examples

It works in these plain es6 module based apps, which must not be transpiled or compiled to run:

• cm-chessboard
• chess-console
• cm-web-modules

API

constructor

/**
 * Create the Modrator
 * @param projectRoot Your project root, mostly `__dirname`
 * @param props Configuration properties
 */
constructor(projectRoot = __dirname, props = {})

Default props

props = {
    nodeModulesPath: path.resolve(__dirname, '../../'), // path to `node_modules`
    libraryFolder: "lib", // library folder where the module sources are linked/copied to
    mode: "copy" // set to "symlink" to symlink sources instead of copying
}

addToLibrary

/**
 * Add the modules of a node package to the library
 * @param packageName Name of the nmp package
 * @param projectSourceRoot The source root inside the package folder
 * @param fileOrFolder The module source folder or file inside the 'projectSourceRoot'
 */
addToLibrary(packageName, projectSourceRoot = "src", fileOrFolder = packageName)