/
index.js
101 lines (85 loc) · 2.17 KB
/
index.js
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const babelCore = require("@babel/core");
const through2 = require("through2");
const PluginError = require("plugin-error");
const applySourceMap = require("vinyl-sourcemaps-apply");
const babelPresetMinify = require("babel-preset-minify");
const NAME = "gulp-babel-minify";
module.exports = gulpBabelMinify;
function gulpBabelMinify(
minifyOpts = {},
{
babel = babelCore,
minifyPreset = babelPresetMinify,
comments = /^\**!|@preserve|@licen[sc]e|@cc_on/,
sourceType = "script"
} = {}
) {
return through2.obj(function(file, enc, callback) {
if (file.isNull()) {
return callback(null, file);
}
if (file.isStream()) {
return callback(new PluginError(NAME, "Streaming not supported"));
}
let inputSourceMap;
if (file.sourceMap && file.sourceMap.mappings) {
inputSourceMap = file.sourceMap;
}
const babelOpts = {
minified: true,
babelrc: false,
ast: false,
sourceType,
/* preset */
presets: [[minifyPreset, minifyOpts]],
/* sourcemaps */
sourceMaps: !!file.sourceMap,
inputSourceMap,
shouldPrintComment(contents) {
return shouldPrintComment(contents, comments);
},
/* file */
filename: file.path,
filenameRelative: file.relative
};
const { result, success, error } = transform({
babel,
input: file.contents.toString(),
babelOpts
});
if (success) {
file.contents = new Buffer(result.code);
if (file.sourceMap) {
if (!result.map.hasOwnProperty("file")) {
result.map.file = file.sourceMap.file;
}
applySourceMap(file, result.map);
}
return callback(null, file);
}
callback(error);
});
}
function transform({ babel, input, babelOpts }) {
try {
return {
success: true,
result: babel.transformSync(input, babelOpts)
};
} catch (e) {
return {
success: false,
error: e
};
}
}
function shouldPrintComment(contents, predicate) {
switch (typeof predicate) {
case "function":
return predicate(contents);
case "object":
return predicate.test(contents);
default:
return !!predicate;
}
}