File size: 1,795 Bytes
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const { builtinModules } = require( 'module' );
const { join } = require( 'path' );
const ExternalModule = require( 'webpack' ).ExternalModule;
function getModule( request ) {
const parts = request.split( '/' );
if ( parts[ 0 ].startsWith( '@' ) ) {
return parts[ 0 ] + '/' + parts[ 1 ];
}
return parts[ 0 ];
}
module.exports = class ExternalModulesWriter {
constructor( options ) {
this.options = {
path: './build',
filename: 'modules.json',
...options,
};
}
apply( compiler ) {
compiler.hooks.emit.tapAsync( 'ExternalModulesWriter', ( compilation, callback ) => {
const externalModules = new Set();
function processModule( module ) {
// Descend into submodules of a `ConcatenatedModule` instance
if ( module.modules ) {
for ( const subModule of module.modules ) {
processModule( subModule );
}
return;
}
if ( ! ( module instanceof ExternalModule ) ) {
return;
}
const requestModule = getModule( module.userRequest );
// native Node.js module, not in node_modules
if ( builtinModules.includes( requestModule ) ) {
return;
}
// loading local file by relative path, not in node_modules
if ( requestModule.startsWith( './' ) || requestModule.startsWith( '../' ) ) {
return;
}
externalModules.add( requestModule );
}
for ( const module of compilation.modules ) {
processModule( module );
}
const json = JSON.stringify( Array.from( externalModules ), null, 2 );
const { mkdir, writeFile } = compiler.outputFileSystem;
const { path, filename } = this.options;
mkdir( path, { recursive: true }, ( err ) => {
if ( err ) {
return callback( err );
}
writeFile( join( path, filename ), json, 'utf8', callback );
} );
} );
}
};
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