added isDateString() and isObjectLiteral()

src/predicate/index.ts

@@ -9,6 +9,7 @@ export * from './isBigIntArray.js';
 export * from './isBinaryNumberString.js';
 export * from './isBoolean.js';
 export * from './isBooleanArray.js';
+export * from './isDateString.js';
 export * from './isDigitsString.js';
 export * from './isFiniteNumber.js';
 export * from './isFunction.js';
@@ -28,6 +29,7 @@ export * from './isNumericString.js';
 export * from './isNumericValue.js';
 export * from './isNumericValueArray.js';
 export * from './isObject.js';
+export * from './isObjectLiteral.js';
 export * from './isObjectWith.js';
 export * from './isOctalNumberString.js';
 export * from './isOptionalArray.js';

src/predicate/isDateString.ts

@@ -0,0 +1,7 @@
+import type { TypePredicateFn } from '../types/functions.js';
+
+/**
+ * Determine if `input` is a valid date string.
+ */
+export const isDateString: TypePredicateFn<string> = (input: unknown): input is string =>
+  typeof input === 'string' && !Number.isNaN(new Date(input).getTime());

src/predicate/isObjectLiteral.ts

@@ -0,0 +1,7 @@
+import type { UnknownRecord } from '../types/records.js';
+
+/**
+ * Determine if `input` is an object literal.
+ */
+export const isObjectLiteral = (input: unknown): input is UnknownRecord =>
+  input !== null && typeof input === 'object' && Object.getPrototypeOf(input) === Object.prototype;

test/predicate/isDateString.test.ts

@@ -0,0 +1,19 @@
+import { describe, it, expect } from 'vitest';
+
+import { isDateString } from '../../src/predicate/isDateString.js';
+
+describe('isDateString()', () => {
+  it.each([
+    new Date().toISOString(),
+    new Date().toLocaleDateString('en-US'),
+    new Date().toLocaleString(),
+    new Date().toUTCString(),
+    new Date().toString(),
+  ])('Returns true for valid input: %j', (input) => {
+    expect(isDateString(input)).toBeTruthy();
+  });
+
+  it.each([Date.now(), 'bad input', true, null, {}, undefined])('Returns false for invalid input: %j', (input) => {
+    expect(isDateString(input)).toBeFalsy();
+  });
+});

test/predicate/isObjectLiteral.test.ts

@@ -0,0 +1,20 @@
+import { describe, it, expect } from 'vitest';
+
+import { isObjectLiteral } from '../../src/predicate/isObjectLiteral.js';
+
+describe('isObjectLiteral()', () => {
+  it('Returns true for valid input', () => {
+    expect(
+      isObjectLiteral({
+        test: true,
+      }),
+    ).toBeTruthy();
+  });
+
+  it.each([Object.create(null), new Date(), globalThis, 1, 'a', true, null, undefined])(
+    'Returns false for invalid input: %j',
+    (input) => {
+      expect(isObjectLiteral(input)).toBeFalsy();
+    },
+  );
+});