Function findDependencyFileName

packages/vite/hmr/server/websocket.ts:809–836

(depFileMap: Map<string, string>, key: string)

}

function findDependencyFileName(depFileMap: Map<string, string>, key: string): string | undefined {
	const variants = new Set<string>();
	const base = key.replace(PAT.QUERY_PATTERN, '');
	variants.add(base);

	const normalized = path.posix.normalize(base);
	variants.add(normalized);

	const withSlash = normalized.startsWith('/') ? normalized : `/${normalized}`;
	variants.add(withSlash);

	for (const variant of Array.from(variants)) {
		if (variant.endsWith('.js')) {
			variants.add(variant.replace(/\.js$/i, '.mjs'));
		} else if (variant.endsWith('.mjs')) {
			variants.add(variant.replace(/\.mjs$/i, '.js'));
		}
	}

	for (const variant of variants) {
		const value = depFileMap.get(variant);
		if (value) {
			return value;
		}
	}

	return undefined;
}

function collectImportDependencies(code: string, importerPath: string): Set<string> {
	const importerDir = path.posix.dirname(importerPath);