/
minify_js.js
52 lines (40 loc) · 1.24 KB
/
minify_js.js
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var assign = require("lodash/assign");
var isFunction = require("lodash/isFunction");
exports.sync = uglify;
exports.async = function(source, options) {
// use the `minify` function if provided
if (isFunction(options.minify)) {
return Promise.resolve().then(function() {
return options.minify(source, options);
});
}
return Promise.resolve()
.then(function() {
return uglify(source, options);
});
};
function uglify(source, options) {
var UglifyJS = require("uglify-es");
var envify = require("loose-envify/replace");
var code = source.code;
var existingSourceMap = source.map;
var uglifyOptions = assign({}, options ? options.uglifyOptions : {});
if (options.sourceMaps) {
var sourceMap = uglifyOptions.sourceMap || {};
if (existingSourceMap) {
var content = getRawSourceMap(existingSourceMap);
var filename = content.sources && content.sources[0];
sourceMap.filename = filename;
sourceMap.content = content;
}
sourceMap.includeSources = !!options.sourceMapsContent;
uglifyOptions.sourceMap = sourceMap;
}
if (options.envify) {
code = envify(code, [process.env]);
}
return UglifyJS.minify(code, uglifyOptions);
}
function getRawSourceMap(map) {
return isFunction(map.toJSON) ? map.toJSON() : map;
}