babel-plugin.js

/* globals require, module, Buffer, console */
/* eslint-disable no-console, prefer-template */
var gutil = require('gulp-util');
var through = require('through2');
var applySourceMap = require('vinyl-sourcemaps-apply');
var objectAssign = require('object-assign');
var replaceExt = require('replace-ext');
var babel = require('babel-core');

module.exports = function(opts) {
    opts = opts || {};

    return through.obj(function(file, enc, cb) {
        if (file.isNull()) {
            return cb(null, file);
        }

        if (file.isStream()) {
            return cb(new gutil.PluginError('gulp-babel',
                'Streaming not supported'));
        }

        try {
            var fileOpts = objectAssign({}, opts, {
                filename: file.path,
                filenameRelative: file.relative,
                sourceMap: !!file.sourceMap,
            });

            var res = babel.transform(file.contents.toString(), fileOpts);

            if (file.sourceMap && res.map) {
                applySourceMap(file, res.map);
            }

            file.contents = new Buffer(res.code);
            file.path = replaceExt(file.path, '.js');
            this.push(file);
        } catch (err) {
            console.log('[Babel] Syntax Error: ' + file.path);
            console.log(err.codeFrame);
            this.emit('end');
        }

        cb();
    });
};