[enhancement] Create gulp plugin about react-native-css HOT 2 CLOSED

var through = require('through2');
var gutil = require('gulp-util');
var PluginError = gutil.PluginError;
var ReactNativeCSS = require('react-native-css')
var transpiler = new ReactNativeCSS();

// Consts
const PLUGIN_NAME = 'gulp-css-to-rnstyles';

function transpileBuffer(fileBuffer, prettyPrint) {
	var contents = transpiler.toJSS(fileBuffer.toString('utf-8'))
	var indentation = prettyPrint ? 4 : 0;
	var jsonOutput = JSON.stringify(contents, null, indentation);
	var output = `module.exports = require('react-native').StyleSheet.create(${jsonOutput});`;
	return Buffer.from(output);
};

function convertCSS(prettyPrint) {
	return through.obj(function(file, enc, cb) {
		if (file.isNull()) {
			return cb(null, file);
		}
		if (file.isBuffer()) {
			file.contents = transpileBuffer(file.contents, prettyPrint);
		}
		if (file.isStream()) {
			this.emit('error', new PluginError(PLUGIN_NAME, 'Streams not supported!'));
		}
		return cb(null, file);
	});
};

module.exports = convertCSS;