/**
 * Checks if the provided argument is a primitive of type string, boolean, or number.
 *
 * @param arg - The value to check.
 * @returns True if the value is a string, boolean, or number; otherwise false.
 *
 * @example
 * isPrimitive("hello"); // true
 * isPrimitive(42);      // true
 * isPrimitive(false);   // true
 * isPrimitive({});      // false
 */
export declare function isPrimitive(arg: any): arg is string | boolean | number;
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