isPlainObject

Checks for object literals and null-prototype records.

Code

isPlainObject.ts

/** Checks whether a value is an object literal or has a null prototype. */
export const isPlainObject = (value: unknown): value is Record<PropertyKey, unknown> => {
  if (value === null || typeof value !== "object") return false;
  const prototype = Object.getPrototypeOf(value);
  return prototype === null || prototype === Object.prototype;
};

Download

wget

Terminal

wget -O src/lib/isPlainObject.ts https://raw.githubusercontent.com/jrTilak/lazykit/HEAD/registry/functions/isPlainObject.ts

degit

Terminal

temp_dir="$(mktemp -d)" && bunx degit jrTilak/lazykit/registry/functions "$temp_dir" && mv "$temp_dir/isPlainObject.ts" src/lib/isPlainObject.ts && rm -r "$temp_dir"

Examples

isPlainObject.example.ts

import { isPlainObject } from "./isPlainObject";

const value: unknown = JSON.parse('{"status":"ready"}');

if (isPlainObject(value)) {
  console.log(value.status);
}

Props

• value (unknown) — Candidate value.
• Returns a type predicate for Record<PropertyKey, unknown>.
• Arrays, dates, functions, and class instances return false.