Added primitive type guards

.changeset/pretty-drinks-reflect.md

@@ -0,0 +1,5 @@
+---
+'@finsweet/ts-utils': minor
+---
+
+Added primitive type guards

src/type-guards/index.ts

@@ -1,3 +1,4 @@
 export { isFormField } from './isFormField';
 export { isKeyOf } from './isKeyOf';
 export { isNotEmpty } from './isNotEmpty';
+export * from './primitives';

src/type-guards/primitives.ts

@@ -0,0 +1,19 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/ban-types */
+export const isString = (value: unknown): value is string => typeof value === 'string';
+
+export const isNumber = (value: unknown): value is number => typeof value === 'number';
+
+export const isBigint = (value: unknown): value is bigint => typeof value === 'bigint';
+
+export const isBoolean = (value: unknown): value is boolean => typeof value === 'boolean';
+
+export const isSymbol = (value: unknown): value is symbol => typeof value === 'symbol';
+
+export const isUndefined = (value: unknown): value is undefined => value === undefined;
+
+export const isNull = (value: unknown): value is null => value === null;
+
+export const isFunction = (value: unknown): value is Function => typeof value === 'function';
+
+export const isObject = (value: unknown): value is Record<any, any> => value !== null && typeof value === 'object';