/**
 * Similar to `JSON.stringify(string)`, but faster. Bizarrely this seems to be
 * faster than the regexp approach
 */
export declare function stringifyString(value: string): string;
/**
 * Equivalent to JSON.stringify, but typically faster.
 */
export declare const stringifyJSON: (value: any) => string;
/**
 * Returns true if the given key is safe to set as the key of a POJO (without a
 * null prototype), false otherwise.
 */
export declare const isSafeObjectPropertyName: (key: string | symbol | number) => boolean;
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