function getSourceMap() {
		if (!map) {
			map = out.generateMap({
				includeContent: true,
				// Must be set for most source map verifiers to work
				source: sourceFileName || filename,
				file: posix.basename(sourceFileName || filename || '')
			});
		}
		return map;
	}
@type {Record<string, ReturnType<typeof createMetaVisitor>>}