File size: 2,495 Bytes
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const fs = require( 'fs' );
const path = require( 'path' );
const _ = require( 'lodash' );
function AssetsWriter( options ) {
this.options = Object.assign(
{
path: './build',
filename: 'assets.json',
runtimeChunk: 'runtime',
manifestFile: 'manifest',
runtimeFile: 'runtime',
},
options
);
}
Object.assign( AssetsWriter.prototype, {
createOutputStream: function () {
this.outputPath = path.join( this.options.path, this.options.filename );
fs.mkdirSync( this.options.path, { recursive: true } );
this.outputStream = fs.createWriteStream( this.outputPath );
},
apply: function ( compiler ) {
const self = this;
compiler.hooks.emit.tapAsync( 'AssetsWriter', ( compilation, callback ) => {
this.createOutputStream();
const stats = compilation.getStats().toJson( {
hash: true,
publicPath: true,
assets: true,
children: false,
chunks: true,
chunkModules: false,
chunkOrigins: false,
entrypoints: true,
modules: false,
source: false,
errorDetails: true,
timings: false,
reasons: false,
} );
function fixupPath( f ) {
return path.join( stats.publicPath, f );
}
// Exclude hot update files (info.hotModuleReplacement) and source maps (info.development)
function isDevelopmentAsset( name ) {
const asset = stats.assets.find( ( a ) => a.name === name );
if ( ! asset ) {
return false;
}
return asset.info.hotModuleReplacement || asset.info.development;
}
const statsToOutput = {};
statsToOutput.manifests = {};
for ( const name in stats.assetsByChunkName ) {
// make the manifest inlineable
if ( String( name ).startsWith( this.options.runtimeChunk ) ) {
// Runtime chunk will have two files due to ExtractManifestPlugin. Both need to be inlined.
statsToOutput.manifests = stats.assetsByChunkName[ name ]
.filter( ( asset ) => ! isDevelopmentAsset( asset ) ) // exclude hot updates and sourcemaps
.map( ( asset ) => compilation.assets[ asset ].source() );
}
}
statsToOutput.assets = _.mapValues( stats.namedChunkGroups, ( { assets } ) =>
_.reject(
assets,
( { name } ) =>
isDevelopmentAsset( name ) ||
name.startsWith( this.options.manifestFile ) ||
name.startsWith( this.options.runtimeFile )
).map( ( { name } ) => fixupPath( name ) )
);
self.outputStream.end( JSON.stringify( statsToOutput, null, '\t' ), callback );
} );
},
} );
module.exports = AssetsWriter;
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