/**
 * Builds a regex matching `node_modules/<pkg>/...` paths for any package in
 * the given list. Returns `null` for an empty list (caller should treat as
 * "no whitelist active") so we don't have to special-case `/(?:)/.test(id)`
 * which matches every string.
 */
export declare const buildClientPackagesPattern: (packages: readonly string[]) => RegExp | null;
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