declare module "node:util/types" {
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import { KeyObject, webcrypto } from "node:crypto";
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/**
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* Returns `true` if the value is a built-in [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) or
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* [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instance.
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*
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* See also `util.types.isArrayBuffer()` and `util.types.isSharedArrayBuffer()`.
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*
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* ```js
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* util.types.isAnyArrayBuffer(new ArrayBuffer()); // Returns true
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* util.types.isAnyArrayBuffer(new SharedArrayBuffer()); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isAnyArrayBuffer(object: unknown): object is ArrayBufferLike;
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/**
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* Returns `true` if the value is an `arguments` object.
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*
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* ```js
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* function foo() {
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* util.types.isArgumentsObject(arguments); // Returns true
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* }
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* ```
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* @since v10.0.0
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*/
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function isArgumentsObject(object: unknown): object is IArguments;
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/**
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* Returns `true` if the value is a built-in [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) instance.
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* This does _not_ include [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instances. Usually, it is
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* desirable to test for both; See `util.types.isAnyArrayBuffer()` for that.
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*
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* ```js
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* util.types.isArrayBuffer(new ArrayBuffer()); // Returns true
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* util.types.isArrayBuffer(new SharedArrayBuffer()); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isArrayBuffer(object: unknown): object is ArrayBuffer;
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/**
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* Returns `true` if the value is an instance of one of the [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) views, such as typed
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* array objects or [`DataView`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView). Equivalent to
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* [`ArrayBuffer.isView()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView).
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*
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* ```js
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* util.types.isArrayBufferView(new Int8Array()); // true
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* util.types.isArrayBufferView(Buffer.from('hello world')); // true
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* util.types.isArrayBufferView(new DataView(new ArrayBuffer(16))); // true
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* util.types.isArrayBufferView(new ArrayBuffer()); // false
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* ```
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* @since v10.0.0
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*/
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function isArrayBufferView(object: unknown): object is NodeJS.ArrayBufferView;
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/**
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* Returns `true` if the value is an [async function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function).
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* This only reports back what the JavaScript engine is seeing;
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* in particular, the return value may not match the original source code if
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* a transpilation tool was used.
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*
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* ```js
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* util.types.isAsyncFunction(function foo() {}); // Returns false
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* util.types.isAsyncFunction(async function foo() {}); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isAsyncFunction(object: unknown): boolean;
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/**
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* Returns `true` if the value is a `BigInt64Array` instance.
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*
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* ```js
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* util.types.isBigInt64Array(new BigInt64Array()); // Returns true
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* util.types.isBigInt64Array(new BigUint64Array()); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isBigInt64Array(value: unknown): value is BigInt64Array;
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/**
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* Returns `true` if the value is a BigInt object, e.g. created
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* by `Object(BigInt(123))`.
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*
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* ```js
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* util.types.isBigIntObject(Object(BigInt(123))); // Returns true
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* util.types.isBigIntObject(BigInt(123)); // Returns false
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* util.types.isBigIntObject(123); // Returns false
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* ```
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* @since v10.4.0
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*/
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function isBigIntObject(object: unknown): object is BigInt;
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/**
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* Returns `true` if the value is a `BigUint64Array` instance.
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*
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* ```js
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* util.types.isBigUint64Array(new BigInt64Array()); // Returns false
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* util.types.isBigUint64Array(new BigUint64Array()); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isBigUint64Array(value: unknown): value is BigUint64Array;
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/**
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* Returns `true` if the value is a boolean object, e.g. created
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* by `new Boolean()`.
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*
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* ```js
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* util.types.isBooleanObject(false); // Returns false
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* util.types.isBooleanObject(true); // Returns false
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* util.types.isBooleanObject(new Boolean(false)); // Returns true
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* util.types.isBooleanObject(new Boolean(true)); // Returns true
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* util.types.isBooleanObject(Boolean(false)); // Returns false
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* util.types.isBooleanObject(Boolean(true)); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isBooleanObject(object: unknown): object is Boolean;
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/**
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* Returns `true` if the value is any boxed primitive object, e.g. created
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* by `new Boolean()`, `new String()` or `Object(Symbol())`.
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*
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* For example:
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*
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* ```js
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* util.types.isBoxedPrimitive(false); // Returns false
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* util.types.isBoxedPrimitive(new Boolean(false)); // Returns true
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* util.types.isBoxedPrimitive(Symbol('foo')); // Returns false
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* util.types.isBoxedPrimitive(Object(Symbol('foo'))); // Returns true
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* util.types.isBoxedPrimitive(Object(BigInt(5))); // Returns true
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* ```
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* @since v10.11.0
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*/
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function isBoxedPrimitive(object: unknown): object is String | Number | BigInt | Boolean | Symbol;
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/**
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* Returns `true` if the value is a built-in [`DataView`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView) instance.
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*
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* ```js
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* const ab = new ArrayBuffer(20);
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* util.types.isDataView(new DataView(ab)); // Returns true
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* util.types.isDataView(new Float64Array()); // Returns false
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* ```
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*
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* See also [`ArrayBuffer.isView()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView).
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* @since v10.0.0
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*/
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function isDataView(object: unknown): object is DataView;
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/**
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* Returns `true` if the value is a built-in [`Date`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date) instance.
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*
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* ```js
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* util.types.isDate(new Date()); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isDate(object: unknown): object is Date;
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/**
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* Returns `true` if the value is a native `External` value.
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*
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* A native `External` value is a special type of object that contains a
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* raw C++ pointer (`void*`) for access from native code, and has no other
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* properties. Such objects are created either by Node.js internals or native
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* addons. In JavaScript, they are
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* [frozen](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze) objects with a
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* `null` prototype.
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*
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* ```c
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* #include <js_native_api.h>
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* #include <stdlib.h>
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* napi_value result;
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* static napi_value MyNapi(napi_env env, napi_callback_info info) {
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* int* raw = (int*) malloc(1024);
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* napi_status status = napi_create_external(env, (void*) raw, NULL, NULL, &result);
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* if (status != napi_ok) {
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* napi_throw_error(env, NULL, "napi_create_external failed");
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* return NULL;
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* }
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* return result;
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* }
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* ...
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* DECLARE_NAPI_PROPERTY("myNapi", MyNapi)
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* ...
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* ```
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*
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* ```js
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* import native from 'napi_addon.node';
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* import { types } from 'node:util';
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*
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* const data = native.myNapi();
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* types.isExternal(data); // returns true
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* types.isExternal(0); // returns false
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* types.isExternal(new String('foo')); // returns false
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* ```
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*
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* For further information on `napi_create_external`, refer to
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* [`napi_create_external()`](https://nodejs.org/docs/latest-v25.x/api/n-api.html#napi_create_external).
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* @since v10.0.0
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*/
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function isExternal(object: unknown): boolean;
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/**
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* Returns `true` if the value is a built-in [`Float16Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float16Array) instance.
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*
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* ```js
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* util.types.isFloat16Array(new ArrayBuffer()); // Returns false
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* util.types.isFloat16Array(new Float16Array()); // Returns true
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* util.types.isFloat16Array(new Float32Array()); // Returns false
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* ```
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* @since v24.0.0
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*/
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function isFloat16Array(object: unknown): object is Float16Array;
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/**
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* Returns `true` if the value is a built-in [`Float32Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array) instance.
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*
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* ```js
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* util.types.isFloat32Array(new ArrayBuffer()); // Returns false
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* util.types.isFloat32Array(new Float32Array()); // Returns true
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* util.types.isFloat32Array(new Float64Array()); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isFloat32Array(object: unknown): object is Float32Array;
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/**
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* Returns `true` if the value is a built-in [`Float64Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float64Array) instance.
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*
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* ```js
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* util.types.isFloat64Array(new ArrayBuffer()); // Returns false
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* util.types.isFloat64Array(new Uint8Array()); // Returns false
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* util.types.isFloat64Array(new Float64Array()); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isFloat64Array(object: unknown): object is Float64Array;
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/**
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* Returns `true` if the value is a generator function.
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* This only reports back what the JavaScript engine is seeing;
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* in particular, the return value may not match the original source code if
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* a transpilation tool was used.
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*
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* ```js
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* util.types.isGeneratorFunction(function foo() {}); // Returns false
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* util.types.isGeneratorFunction(function* foo() {}); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isGeneratorFunction(object: unknown): object is GeneratorFunction;
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/**
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* Returns `true` if the value is a generator object as returned from a
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* built-in generator function.
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* This only reports back what the JavaScript engine is seeing;
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* in particular, the return value may not match the original source code if
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* a transpilation tool was used.
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*
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* ```js
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* function* foo() {}
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* const generator = foo();
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* util.types.isGeneratorObject(generator); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isGeneratorObject(object: unknown): object is Generator;
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/**
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* Returns `true` if the value is a built-in [`Int8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array) instance.
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*
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* ```js
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* util.types.isInt8Array(new ArrayBuffer()); // Returns false
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* util.types.isInt8Array(new Int8Array()); // Returns true
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* util.types.isInt8Array(new Float64Array()); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isInt8Array(object: unknown): object is Int8Array;
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/**
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* Returns `true` if the value is a built-in [`Int16Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int16Array) instance.
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*
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* ```js
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* util.types.isInt16Array(new ArrayBuffer()); // Returns false
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* util.types.isInt16Array(new Int16Array()); // Returns true
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* util.types.isInt16Array(new Float64Array()); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isInt16Array(object: unknown): object is Int16Array;
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/**
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* Returns `true` if the value is a built-in [`Int32Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int32Array) instance.
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*
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* ```js
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* util.types.isInt32Array(new ArrayBuffer()); // Returns false
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* util.types.isInt32Array(new Int32Array()); // Returns true
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* util.types.isInt32Array(new Float64Array()); // Returns false
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* ```
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* @since v10.0.0
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*/
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function isInt32Array(object: unknown): object is Int32Array;
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/**
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* Returns `true` if the value is a built-in [`Map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) instance.
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*
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* ```js
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* util.types.isMap(new Map()); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isMap<T>(
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object: T | {},
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): object is T extends ReadonlyMap<any, any> ? (unknown extends T ? never : ReadonlyMap<any, any>)
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: Map<unknown, unknown>;
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/**
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* Returns `true` if the value is an iterator returned for a built-in [`Map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) instance.
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*
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* ```js
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* const map = new Map();
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* util.types.isMapIterator(map.keys()); // Returns true
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* util.types.isMapIterator(map.values()); // Returns true
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* util.types.isMapIterator(map.entries()); // Returns true
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* util.types.isMapIterator(map[Symbol.iterator]()); // Returns true
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* ```
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* @since v10.0.0
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*/
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function isMapIterator(object: unknown): boolean;
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/**
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* Returns `true` if the value is an instance of a [Module Namespace Object](https://tc39.github.io/ecma262/#sec-module-namespace-exotic-objects).
|
*
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* ```js
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* import * as ns from './a.js';
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*
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* util.types.isModuleNamespaceObject(ns); // Returns true
|
* ```
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* @since v10.0.0
|
*/
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function isModuleNamespaceObject(value: unknown): boolean;
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/**
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* Returns `true` if the value was returned by the constructor of a
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* [built-in `Error` type](https://tc39.es/ecma262/#sec-error-objects).
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*
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* ```js
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* console.log(util.types.isNativeError(new Error())); // true
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* console.log(util.types.isNativeError(new TypeError())); // true
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* console.log(util.types.isNativeError(new RangeError())); // true
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* ```
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*
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* Subclasses of the native error types are also native errors:
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*
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* ```js
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* class MyError extends Error {}
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* console.log(util.types.isNativeError(new MyError())); // true
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* ```
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*
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* A value being `instanceof` a native error class is not equivalent to `isNativeError()`
|
* returning `true` for that value. `isNativeError()` returns `true` for errors
|
* which come from a different [realm](https://tc39.es/ecma262/#realm) while `instanceof Error` returns `false`
|
* for these errors:
|
*
|
* ```js
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* import { createContext, runInContext } from 'node:vm';
|
* import { types } from 'node:util';
|
*
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* const context = createContext({});
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* const myError = runInContext('new Error()', context);
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* console.log(types.isNativeError(myError)); // true
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* console.log(myError instanceof Error); // false
|
* ```
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*
|
* Conversely, `isNativeError()` returns `false` for all objects which were not
|
* returned by the constructor of a native error. That includes values
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* which are `instanceof` native errors:
|
*
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* ```js
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* const myError = { __proto__: Error.prototype };
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* console.log(util.types.isNativeError(myError)); // false
|
* console.log(myError instanceof Error); // true
|
* ```
|
* @since v10.0.0
|
* @deprecated The `util.types.isNativeError` API is deprecated. Please use `Error.isError` instead.
|
*/
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function isNativeError(object: unknown): object is Error;
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/**
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* Returns `true` if the value is a number object, e.g. created
|
* by `new Number()`.
|
*
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* ```js
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* util.types.isNumberObject(0); // Returns false
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* util.types.isNumberObject(new Number(0)); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
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function isNumberObject(object: unknown): object is Number;
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/**
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* Returns `true` if the value is a built-in [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).
|
*
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* ```js
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* util.types.isPromise(Promise.resolve(42)); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
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function isPromise(object: unknown): object is Promise<unknown>;
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/**
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* Returns `true` if the value is a [`Proxy`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) instance.
|
*
|
* ```js
|
* const target = {};
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* const proxy = new Proxy(target, {});
|
* util.types.isProxy(target); // Returns false
|
* util.types.isProxy(proxy); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isProxy(object: unknown): boolean;
|
/**
|
* Returns `true` if the value is a regular expression object.
|
*
|
* ```js
|
* util.types.isRegExp(/abc/); // Returns true
|
* util.types.isRegExp(new RegExp('abc')); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isRegExp(object: unknown): object is RegExp;
|
/**
|
* Returns `true` if the value is a built-in [`Set`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) instance.
|
*
|
* ```js
|
* util.types.isSet(new Set()); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isSet<T>(
|
object: T | {},
|
): object is T extends ReadonlySet<any> ? (unknown extends T ? never : ReadonlySet<any>) : Set<unknown>;
|
/**
|
* Returns `true` if the value is an iterator returned for a built-in [`Set`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) instance.
|
*
|
* ```js
|
* const set = new Set();
|
* util.types.isSetIterator(set.keys()); // Returns true
|
* util.types.isSetIterator(set.values()); // Returns true
|
* util.types.isSetIterator(set.entries()); // Returns true
|
* util.types.isSetIterator(set[Symbol.iterator]()); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isSetIterator(object: unknown): boolean;
|
/**
|
* Returns `true` if the value is a built-in [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instance.
|
* This does _not_ include [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) instances. Usually, it is
|
* desirable to test for both; See `util.types.isAnyArrayBuffer()` for that.
|
*
|
* ```js
|
* util.types.isSharedArrayBuffer(new ArrayBuffer()); // Returns false
|
* util.types.isSharedArrayBuffer(new SharedArrayBuffer()); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isSharedArrayBuffer(object: unknown): object is SharedArrayBuffer;
|
/**
|
* Returns `true` if the value is a string object, e.g. created
|
* by `new String()`.
|
*
|
* ```js
|
* util.types.isStringObject('foo'); // Returns false
|
* util.types.isStringObject(new String('foo')); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isStringObject(object: unknown): object is String;
|
/**
|
* Returns `true` if the value is a symbol object, created
|
* by calling `Object()` on a `Symbol` primitive.
|
*
|
* ```js
|
* const symbol = Symbol('foo');
|
* util.types.isSymbolObject(symbol); // Returns false
|
* util.types.isSymbolObject(Object(symbol)); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isSymbolObject(object: unknown): object is Symbol;
|
/**
|
* Returns `true` if the value is a built-in [`TypedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray) instance.
|
*
|
* ```js
|
* util.types.isTypedArray(new ArrayBuffer()); // Returns false
|
* util.types.isTypedArray(new Uint8Array()); // Returns true
|
* util.types.isTypedArray(new Float64Array()); // Returns true
|
* ```
|
*
|
* See also [`ArrayBuffer.isView()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView).
|
* @since v10.0.0
|
*/
|
function isTypedArray(object: unknown): object is NodeJS.TypedArray;
|
/**
|
* Returns `true` if the value is a built-in [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) instance.
|
*
|
* ```js
|
* util.types.isUint8Array(new ArrayBuffer()); // Returns false
|
* util.types.isUint8Array(new Uint8Array()); // Returns true
|
* util.types.isUint8Array(new Float64Array()); // Returns false
|
* ```
|
* @since v10.0.0
|
*/
|
function isUint8Array(object: unknown): object is Uint8Array;
|
/**
|
* Returns `true` if the value is a built-in [`Uint8ClampedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray) instance.
|
*
|
* ```js
|
* util.types.isUint8ClampedArray(new ArrayBuffer()); // Returns false
|
* util.types.isUint8ClampedArray(new Uint8ClampedArray()); // Returns true
|
* util.types.isUint8ClampedArray(new Float64Array()); // Returns false
|
* ```
|
* @since v10.0.0
|
*/
|
function isUint8ClampedArray(object: unknown): object is Uint8ClampedArray;
|
/**
|
* Returns `true` if the value is a built-in [`Uint16Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array) instance.
|
*
|
* ```js
|
* util.types.isUint16Array(new ArrayBuffer()); // Returns false
|
* util.types.isUint16Array(new Uint16Array()); // Returns true
|
* util.types.isUint16Array(new Float64Array()); // Returns false
|
* ```
|
* @since v10.0.0
|
*/
|
function isUint16Array(object: unknown): object is Uint16Array;
|
/**
|
* Returns `true` if the value is a built-in [`Uint32Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array) instance.
|
*
|
* ```js
|
* util.types.isUint32Array(new ArrayBuffer()); // Returns false
|
* util.types.isUint32Array(new Uint32Array()); // Returns true
|
* util.types.isUint32Array(new Float64Array()); // Returns false
|
* ```
|
* @since v10.0.0
|
*/
|
function isUint32Array(object: unknown): object is Uint32Array;
|
/**
|
* Returns `true` if the value is a built-in [`WeakMap`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap) instance.
|
*
|
* ```js
|
* util.types.isWeakMap(new WeakMap()); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isWeakMap(object: unknown): object is WeakMap<object, unknown>;
|
/**
|
* Returns `true` if the value is a built-in [`WeakSet`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet) instance.
|
*
|
* ```js
|
* util.types.isWeakSet(new WeakSet()); // Returns true
|
* ```
|
* @since v10.0.0
|
*/
|
function isWeakSet(object: unknown): object is WeakSet<object>;
|
/**
|
* Returns `true` if `value` is a `KeyObject`, `false` otherwise.
|
* @since v16.2.0
|
*/
|
function isKeyObject(object: unknown): object is KeyObject;
|
/**
|
* Returns `true` if `value` is a `CryptoKey`, `false` otherwise.
|
* @since v16.2.0
|
*/
|
function isCryptoKey(object: unknown): object is webcrypto.CryptoKey;
|
}
|
declare module "util/types" {
|
export * from "node:util/types";
|
}
|
