Licenses of ES modules in concatenated modules are not emitted

[iorate]

Hello, thank you for this useful plugin.

license-webpack-plugin does not extract licenses of ES modules included in module concatenation with the latest version of webpack 5. The repository to reproduce this issue is here: https://github.com/iorate/license-webpack-plugin-concatenated-modules

webpack concatenates ES modules if possible in production mode, and gives them identifiers of form javascript/esm|<path>. The current version of license-webpack-plugin does not handle identifiers of this form:

license-webpack-plugin/src/WebpackModuleFileIterator.ts

Lines 36 to 69 in 185efbc

	getActualFilename(filename: string | null | undefined): string | null {
	if (
	!filename ||
	filename.indexOf('delegated ') === 0 ||
	filename.indexOf('external ') === 0 ||
	filename.indexOf('container entry ') === 0 ||
	filename.indexOf('ignored|') === 0 ||
	filename.indexOf('remote ') === 0 ||
	filename.indexOf('data:') === 0
	) {
	return null;
	}
	if (filename.indexOf('webpack/runtime') === 0) {
	return this.requireResolve('webpack');
	}
	if (filename.indexOf('!') > -1) {
	// file was procesed by loader, last item after ! is the actual file
	const tokens = filename.split('!');
	return tokens[tokens.length - 1];
	}
	if (filename.indexOf('provide module') === 0) {
	return filename.split('=')[1].trim();
	}
	if (filename.indexOf('consume-shared-module') === 0) {
	const tokens = filename.split('|');
	// 3rd to last item is the filename, see identifier() function in node_modules/webpack/lib/sharing/ConsumeSharedModule.js
	const actualFilename = tokens[tokens.length - 3];
	if (actualFilename === 'undefined') {
	return null;
	}
	return actualFilename;
	}
	return filename;
	}

... and does not emit licenses of modules with such identifiers.

Versions

node.js 16.13.2
webpack 5.66.0
license-webpack-plugin 4.0.0

[jayaddison]

Note: in addition to the workaround listed in the linked repository: webpack v4 and v5 also support an optimization.concatenateModules option that can be disabled and should allow affected licenses to be (re)discovered as expected.