Add boolean Validator to json module

lib/entry-points.js

@@ -92812,10 +92812,10 @@ var require_util12 = __commonJS({
       return objectToString(arg) === "[object Array]";
     }
     exports2.isArray = isArray2;
-    function isBoolean(arg) {
+    function isBoolean2(arg) {
       return typeof arg === "boolean";
     }
-    exports2.isBoolean = isBoolean;
+    exports2.isBoolean = isBoolean2;
     function isNull(arg) {
       return arg === null;
     }
@@ -144592,6 +144592,9 @@ function isString(value) {
 function isNumber(value) {
   return typeof value === "number";
 }
+function isBoolean(value) {
+  return typeof value === "boolean";
+}
 function isStringOrUndefined(value) {
   return value === void 0 || isString(value);
 }
@@ -144607,6 +144610,7 @@ function makeValidator(validate) {
 }
 var string = makeValidator(isString);
 var number = makeValidator(isNumber);
+var boolean = makeValidator(isBoolean);
 function array(validator) {
   const validate = (val) => {
     return isArray(val) && val.every((e) => validator.validate(e));

src/json/index.ts

@@ -35,6 +35,11 @@ export function isNumber(value: unknown): value is number {
   return typeof value === "number";
 }
 
+/** Asserts that `value` is a boolean. */
+export function isBoolean(value: unknown): value is boolean {
+  return typeof value === "boolean";
+}
+
 /** Asserts that `value` is either a string or undefined. */
 export function isStringOrUndefined(
   value: unknown,
@@ -79,6 +84,9 @@ export const string = makeValidator(isString);
 /** A validator for number fields in schemas. */
 export const number = makeValidator(isNumber);
 
+/** A validator for boolean fields in schemas. */
+export const boolean = makeValidator(isBoolean);
+
 /** A validator for arrays. */
 export function array<T>(validator: Validator<T>) {
   const validate = (val: unknown) => {