const fs = require( 'fs' );
const path = require( 'path' );
const assert = require( 'assert' );

const HELPER = '\0helper';

module.exports = {
	description: 'excludes plugin helpers from sources',
	options: {
		format: 'cjs',
		plugins: [{
			resolveId ( id ) {
				if ( id === HELPER ) return id;
			},

			load ( id ) {
				if ( id === HELPER ) {
					return fs.readFileSync( path.join( __dirname, 'helper.js' ), 'utf-8' );
				}
			}
		}]
	},
	test: ( code, map ) => {
		assert.equal( map.sources.length, 1 );
		assert.equal( map.sourcesContent.length, 1 );
		assert.ok( /main/.test( map.sources[0] ) );
	}
};