builder/lib/processors/uglifier.js

  1. const terser = require("terser");
  2. /**
  3.  * Preserve comments which contain:
  4.  * <ul>
  5.  *  <li>copyright notice</li>
  6.  *  <li>license terms</li>
  7.  *  <li>"@ui5-bundle"</li>
  8.  *  <li>"@ui5-bundle-raw-include"</li>
  9.  * </ul>
  10.  *
  11.  * @type {RegExp}
  12.  */
  13. const copyrightCommentsAndBundleCommentPattern = /copyright|\(c\)(?:[0-9]+|\s+[0-9A-za-z])|released under|license|\u00a9|^@ui5-bundle-raw-include |^@ui5-bundle /i;
  15. /**
  16.  * Minifies the supplied resources.
  17.  *
  18.  * @public
  19.  * @alias module:@ui5/builder.processors.uglifier
  20.  * @param {object} parameters Parameters
  21.  * @param {module:@ui5/fs.Resource[]} parameters.resources List of resources to be processed
  22.  * @returns {Promise<module:@ui5/fs.Resource[]>} Promise resolving with uglified resources
  23.  */
  24. module.exports = function({resources}) {
  25. 	return Promise.all(resources.map(async (resource) => {
  26. 		const code = await resource.getString();
  27. 		try {
  28. 			const result = await terser.minify({
  29. 				[resource.getPath()]: code
  30. 			}, {
  31. 				output: {
  32. 					comments: copyrightCommentsAndBundleCommentPattern,
  33. 					wrap_func_args: false
  34. 				},
  35. 				compress: false
  36. 			});
  37. 			resource.setString(result.code);
  38. 			return resource;
  39. 		} catch (err) {
  40. 			throw new Error(
  41. 				`Uglification failed with error: ${err.message} in file ${err.filename} ` +
  42. 				`(line ${err.line}, col ${err.col}, pos ${err.pos})`);
  43. 		}
  44. 	}));
  45. };