/**
 * Generic JSON-shape primitives for reading untyped input — no config
 * vocabulary, no error-message formatting, just shape checks any caller
 * (config, plugin manifests, MCP payloads) can build its own messages on top
 * of.
 */
/** True when `v` is a non-null object and not an array, and therefore safe to index. */
export declare function isPlainObject(v: unknown): v is Record<string, unknown>;
/** `v` when it is a string, otherwise `undefined`. */
export declare function asString(v: unknown): string | undefined;
/** `v` when it is a non-empty string, otherwise `undefined`. */
export declare function nonEmptyString(v: unknown): string | undefined;
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