workbox-webpack-plugin
Version:
A plugin for your Webpack build process, helping you generate a manifest of local files that workbox-sw should precache.
49 lines (42 loc) • 1.78 kB
JavaScript
;
/*
Copyright 2019 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
const sourceMapURL = require('source-map-url');
const upath = require('upath');
/**
* If our bundled swDest file contains a sourcemap, we would invalidate that
* mapping if we just replaced injectionPoint with the stringified manifest.
* Instead, we need to update the swDest contents as well as the sourcemap
* at the same time.
*
* See https://github.com/GoogleChrome/workbox/issues/2235
*
* @param {Object} compilation The current webpack compilation.
* @param {string} swContents The contents of the swSrc file, which may or
* may not include a valid sourcemap comment.
* @param {string} swDest The configured swDest value.
* @return {string|undefined} If the swContents contains a valid soucemap
* comment pointing to an asset present in the compilation, this will return the
* name of that asset. Otherwise, it will return undefined.
*
* @private
*/
module.exports = (compilation, swContents, swDest) => {
const url = sourceMapURL.getFrom(swContents);
if (url) {
// Translate the relative URL to what the presumed name for the webpack
// asset should be.
// This *might* not be a valid asset if the sourcemap URL that was found
// was added by another module incidentally.
// See https://github.com/GoogleChrome/workbox/issues/2250
const swAssetDirname = upath.dirname(swDest);
const sourcemapURLAssetName = upath.normalize(upath.join(swAssetDirname, url)); // Not sure if there's a better way to check for asset existence?
if (compilation.getAsset(sourcemapURLAssetName)) {
return sourcemapURLAssetName;
}
}
};