53 lines
1.8 KiB
JavaScript
53 lines
1.8 KiB
JavaScript
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'use strict';
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var nano = require('cssnano'),
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bufferFrom = require('buffer-from'),
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assign = require('object-assign'),
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PluginError = require('plugin-error'),
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Transform = require('stream').Transform,
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applySourceMap = require('vinyl-sourcemaps-apply'),
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PLUGIN_NAME = 'gulp-cssnano';
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module.exports = function (opts) {
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opts = opts || {};
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var stream = new Transform({objectMode: true});
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stream._transform = function (file, encoding, cb) {
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if (file.isNull()) {
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return cb(null, file);
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}
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if (file.isStream()) {
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var error = 'Streaming not supported';
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return cb(new PluginError(PLUGIN_NAME, error));
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} else if (file.isBuffer()) {
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return nano.process(String(file.contents), assign(opts, {
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map: (file.sourceMap) ? {annotation: false} : false,
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from: file.relative,
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to: file.relative
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})).then(function (result) {
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if (result.map && file.sourceMap) {
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applySourceMap(file, String(result.map));
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}
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file.contents = bufferFrom(result.css);
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this.push(file);
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cb();
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}.bind(this))
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.catch(function (error) {
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var errorOptions = {fileName: file.path};
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if (error.name === 'CssSyntaxError') {
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error = error.message + error.showSourceCode();
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errorOptions.showStack = false;
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}
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// Prevent stream’s unhandled exception from
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// being suppressed by Promise
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setImmediate(function () {
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cb(new PluginError(PLUGIN_NAME, error));
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});
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});
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}
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};
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return stream;
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};
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