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const fs = require( 'fs' );
const path = require( 'path' );
/**
* Plugin name.
* @type {string}
*/
const PLUGIN_NAME = 'GenerateChunksMap';
class GenerateChunksMapPlugin {
constructor( { output = path.resolve( '.', 'map.json' ), base_dir = '.' } = {} ) {
this.output = output;
this.base_dir = base_dir;
}
apply( compiler ) {
compiler.hooks.done.tap( PLUGIN_NAME, ( { compilation } ) => {
// Generate chunks map
const { chunks } = compilation;
const chunksMap = {};
for ( const chunk of chunks ) {
// This logic assumes there is only one `.js`. If there are more than one `.js` file linked to a chunk,
// this will be non deterministic as `chunk.files` iteration order is not guaranteed.
const name = Array.from( chunk.files ).find( ( file ) => /.js(\?.*)?$/.test( file ) );
if ( ! name ) {
continue;
}
const modules = [ ...compilation.chunkGraph.getChunkModulesIterable( chunk ) ]
.reduce( ( acc, item ) => acc.concat( item.modules || item ), [] )
.map( ( { userRequest } ) => userRequest && path.relative( this.base_dir, userRequest ) )
.filter( ( module ) => !! module );
chunksMap[ name ] = modules;
}
// Write chunks map
fs.writeFileSync( this.output, JSON.stringify( chunksMap ) );
} );
}
}
module.exports = GenerateChunksMapPlugin;
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