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- 'use strict';
- const gutil = require('gulp-util');
- const through = require('through2');
- const applySourceMap = require('vinyl-sourcemaps-apply');
- const autoprefixer = require('autoprefixer');
- const postcss = require('postcss');
- module.exports = opts => {
- return through.obj((file, enc, cb) => {
- if (file.isNull()) {
- cb(null, file);
- return;
- }
- if (file.isStream()) {
- cb(new gutil.PluginError('gulp-autoprefixer', 'Streaming not supported'));
- return;
- }
- postcss(autoprefixer(opts)).process(file.contents.toString(), {
- map: file.sourceMap ? {annotation: false} : false,
- from: file.path,
- to: file.path
- }).then(res => {
- file.contents = Buffer.from(res.css);
- if (res.map && file.sourceMap) {
- applySourceMap(file, res.map.toString());
- }
- const warnings = res.warnings();
- if (warnings.length > 0) {
- gutil.log('gulp-autoprefixer:', '\n ' + warnings.join('\n '));
- }
- setImmediate(cb, null, file);
- }).catch(err => {
- const cssError = err.name === 'CssSyntaxError';
- if (cssError) {
- err.message += err.showSourceCode();
- }
- // Prevent stream unhandled exception from being suppressed by Promise
- setImmediate(cb, new gutil.PluginError('gulp-autoprefixer', err, {
- fileName: file.path,
- showStack: !cssError
- }));
- });
- });
- };
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