export declare const MAX_SERVER_EXTERNAL_PACKAGE_COUNT = 128;
export declare const MAX_SERVER_EXTERNAL_PACKAGE_NAME_LENGTH = 214;
/** Return whether a value names one bare npm package root. */
export declare function isValidServerExternalPackageName(value: string): boolean;
/** Return whether every configured package name occurs exactly once. */
export declare function hasUniqueServerExternalPackages(values: readonly string[]): boolean;
/** Capture an immutable, order-independent package list for one transform graph. */
export declare function canonicalizeServerExternalPackages(values: readonly string[] | undefined): readonly string[] | undefined;
/** Build a stable framed identity for cache keys whose output depends on this list. */
export declare function buildServerExternalPackagesIdentity(values: readonly string[] | undefined): string | undefined;
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