rollup-plugin-real-babili/dist/rollup-plugin-real-babili.es2015.js

Simple rollup plugin for minifying code using Babili.

import { getCommentContent } from '@comandeer/babel-plugin-banner/utils';
import { decode, encode } from 'sourcemap-codec';
import { transform } from 'babel-core';

function fixMappings(mappings) {
	if (typeof mappings !== 'string') {
		return '';
	}

	mappings = decode(mappings);
	var lastLine = mappings[0][mappings[0].length - 1];

	// If the last line has only one segment with only one item,
	// just drop the whole line.
	if (lastLine && lastLine.length === 1) {
		mappings[0].pop();
	}

	return encode(mappings);
}

function babili() {
	var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

	return {
		name: 'babili',

		transformBundle: function transformBundle(bundle, rollupOptions) {
			var babelConf = {
				presets: ['babili'],
				sourceMaps: typeof options.sourceMap !== 'undefined' ? Boolean(options.sourceMap) : true,
				comments: typeof options.comments !== 'undefined' ? Boolean(options.comments) : true
			};

			if (typeof options.banner === 'string' || typeof rollupOptions.banner === 'string') {
				(function () {
					var banner = options.banner || rollupOptions.banner;
					var bannerContent = getCommentContent(banner);
					var isAlreadyInserted = false;

					babelConf.plugins = [['@comandeer/babel-plugin-banner', {
						banner: banner
					}]];

					if (!babelConf.comments) {
						babelConf.shouldPrintComment = function (comment) {
							if (!isAlreadyInserted && comment === bannerContent) {
								isAlreadyInserted = true;

								return true;
							}

							return false;
						};
					}
				})();
			}

			var _transform = transform(bundle, babelConf),
			    code = _transform.code,
			    map = _transform.map;

			if (map) {
				map.mappings = fixMappings(map.mappings);
			}

			return {
				code: code,
				map: map
			};
		}
	};
}

babili.fixMappings = fixMappings;

export default babili;