/** Anything but `object` or `function` */
export type Primitive = null | undefined | string | number | boolean | symbol | bigint;
/**
 * Is `x` a `Primitive`?
 *
 * - `Primitive` is anything but object or function
 *
 * @example
 *
 * ```ts
 * const b = isPrimitive(123) // `true`
 * ```
 *
 * @param x - Value to be checked if it's a `Primitive`
 * @returns `true` if `x` is `Primitive`
 */
export declare function isPrimitive(x: unknown): x is Primitive;
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