linvail/lib/runtime/domain.mjs

Provenancial Equality for JavaScript

const {
  Object: { hasOwn },
} = globalThis;

/**
 * @type {(
 *   key: PropertyKey,
 * ) => key is import("./domain.d.ts").NonLengthPropertyKey}
 */
export const isNonLengthPropertyKey = (key) => key !== "length";

/**
 * @type {<V>(
 *   descriptor: import("./domain.d.ts").Descriptor<V>,
 * ) => descriptor is import("./domain.d.ts").DataDescriptor<V>}
 */
export const isDataDescriptor = (descriptor) => hasOwn(descriptor, "value");

/**
 * @type {<V>(
 *   descriptor: import("./domain.d.ts").Descriptor<V>,
 * ) => descriptor is import("./domain.d.ts").AccessorDescriptor}
 */
export const isAccessorDescriptor = (descriptor) =>
  !hasOwn(descriptor, "value");

/**
 * @type {(
 *   value: import("./domain.d.ts").Value,
 * ) => value is import("./domain.d.ts").StandardPrimitive}
 */
export const isStandardPrimitive = (value) => {
  if (value == null) {
    return true;
  } else {
    const type = typeof value;
    return (
      type === "boolean" ||
      type === "number" ||
      type === "string" ||
      type === "bigint"
    );
  }
};

/**
 * @type {(
 *   value: unknown,
 * ) => value is import("./domain.d.ts").Primitive}
 */
export const isPrimitive = (value) => {
  if (value == null) {
    return true;
  } else {
    const type = typeof value;
    return (
      type === "boolean" ||
      type === "number" ||
      type === "string" ||
      type === "bigint" ||
      type === "symbol"
    );
  }
};