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minify.js
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minify.js
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/* eslint-disable
arrow-body-style
*/
import uglify from 'uglify-es';
const buildUglifyOptions = ({
ecma,
warnings,
parse = {},
compress = {},
mangle,
output,
toplevel,
nameCache,
ie8,
/* eslint-disable camelcase */
keep_classnames,
keep_fnames,
/* eslint-enable camelcase */
safari10,
} = {}) => ({
ecma,
warnings,
parse: { ...parse },
compress: typeof compress === 'boolean' ? compress : { ...compress },
// eslint-disable-next-line no-nested-ternary
mangle: mangle == null ? true : typeof mangle === 'boolean' ? mangle : { ...mangle },
output: {
shebang: true,
comments: false,
beautify: false,
semicolons: true,
...output,
},
// Ignoring sourceMap from options
sourceMap: null,
toplevel,
nameCache,
ie8,
keep_classnames,
keep_fnames,
safari10,
});
const buildComments = (options, uglifyOptions, extractedComments) => {
const condition = {};
const commentsOpts = uglifyOptions.output.comments;
// /^\**!|@preserve|@license|@cc_on/
if (typeof options.extractComments === 'boolean') {
condition.preserve = commentsOpts;
condition.extract = /^\**!|@preserve|@license|@cc_on/;
} else if (
typeof options.extractComments === 'string' ||
options.extractComments instanceof RegExp
) {
// extractComments specifies the extract condition and commentsOpts specifies the preserve condition
condition.preserve = commentsOpts;
condition.extract = options.extractComments;
} else if (typeof options.extractComments === 'function') {
condition.preserve = false;
condition.extract = options.extractComments;
} else if (
Object.prototype.hasOwnProperty.call(options.extractComments, 'condition')
) {
// Extract condition is given in extractComments.condition
condition.preserve = commentsOpts;
condition.extract = options.extractComments.condition;
} else {
// No extract condition is given. Extract comments that match commentsOpts instead of preserving them
condition.preserve = false;
condition.extract = commentsOpts;
}
// Ensure that both conditions are functions
['preserve', 'extract'].forEach((key) => {
let regexStr;
let regex;
switch (typeof (condition[key])) {
case 'boolean':
condition[key] = condition[key] ? () => true : () => false;
break;
case 'function':
break;
case 'string':
if (condition[key] === 'all') {
condition[key] = () => true;
break;
}
if (condition[key] === 'some') {
condition[key] = (astNode, comment) => {
return comment.type === 'comment2' && /@preserve|@license|@cc_on/i.test(comment.value);
};
break;
}
regexStr = condition[key];
condition[key] = (astNode, comment) => {
return new RegExp(regexStr).test(comment.value);
};
break;
default:
regex = condition[key];
condition[key] = (astNode, comment) => (regex.test(comment.value));
}
});
// Redefine the comments function to extract and preserve
// comments according to the two conditions
return (astNode, comment) => {
if (condition.extract(astNode, comment)) {
extractedComments.push(
comment.type === 'comment2' ? `/*${comment.value}*/` : `//${comment.value}`,
);
}
return condition.preserve(astNode, comment);
};
};
const minify = (options) => {
const { file, input, inputSourceMap, extractComments, minify: minifyFn } = options;
if (minifyFn) {
return minifyFn({ [file]: input }, inputSourceMap);
}
// Copy uglify options
const uglifyOptions = buildUglifyOptions(options.uglifyOptions);
// Add source map data
if (inputSourceMap) {
uglifyOptions.sourceMap = {
content: inputSourceMap,
};
}
const extractedComments = [];
if (extractComments) {
uglifyOptions.output.comments = buildComments(
options,
uglifyOptions,
extractedComments,
);
}
const { error, map, code, warnings } = uglify.minify(
{ [file]: input },
uglifyOptions,
);
return { error, map, code, warnings, extractedComments };
};
export default minify;