@thi.ng/checks/is-primitive.js

Collection of 70+ type, feature & value checks

/**
 * Returns true if `x` is a string, number or boolean.
 *
 * @param x -
 */
export const isPrimitive = (x) => {
    const t = typeof x;
    return t === "string" || t === "number" || t === "boolean";
};