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+# is [![Build Status](https://travis-ci.org/sindresorhus/is.svg?branch=master)](https://travis-ci.org/sindresorhus/is)
+
+> Type check values: `is.string('🦄') //=> true`
+
+<img src="header.gif" width="182" align="right">
+
+
+## Install
+
+```
+$ npm install @sindresorhus/is
+```
+
+
+## Usage
+
+```js
+const is = require('@sindresorhus/is');
+
+is('🦄');
+//=> 'string'
+
+is(new Map());
+//=> 'Map'
+
+is.number(6);
+//=> true
+```
+
+When using `is` together with TypeScript, [type guards](http://www.typescriptlang.org/docs/handbook/advanced-types.html#type-guards-and-differentiating-types) are being used to infer the correct type inside if-else statements.
+
+```ts
+import is from '@sindresorhus/is';
+
+const padLeft = (value: string, padding: string | number) => {
+	if (is.number(padding)) {
+		// `padding` is typed as `number`
+		return Array(padding + 1).join(' ') + value;
+	}
+
+	if (is.string(padding)) {
+		// `padding` is typed as `string`
+		return padding + value;
+	}
+
+	throw new TypeError(`Expected 'padding' to be of type 'string' or 'number', got '${is(padding)}'.`);
+}
+
+padLeft('🦄', 3);
+//=> '   🦄'
+
+padLeft('🦄', '🌈');
+//=> '🌈🦄'
+```
+
+
+## API
+
+### is(value)
+
+Returns the type of `value`.
+
+Primitives are lowercase and object types are camelcase.
+
+Example:
+
+- `'undefined'`
+- `'null'`
+- `'string'`
+- `'symbol'`
+- `'Array'`
+- `'Function'`
+- `'Object'`
+
+Note: It will throw an error if you try to feed it object-wrapped primitives, as that's a bad practice. For example `new String('foo')`.
+
+### is.{method}
+
+All the below methods accept a value and returns a boolean for whether the value is of the desired type.
+
+#### Primitives
+
+##### .undefined(value)
+##### .null(value)
+##### .string(value)
+##### .number(value)
+##### .boolean(value)
+##### .symbol(value)
+
+#### Built-in types
+
+##### .array(value)
+##### .function(value)
+##### .buffer(value)
+##### .object(value)
+
+Keep in mind that [functions are objects too](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions).
+
+##### .numericString(value)
+
+Returns `true` for a string that represents a number. For example, `'42'` and `'-8'`.
+
+Note: `'NaN'` returns `false`, but `'Infinity'` and `'-Infinity'` return `true`.
+
+##### .regExp(value)
+##### .date(value)
+##### .error(value)
+##### .nativePromise(value)
+##### .promise(value)
+
+Returns `true` for any object with a `.then()` and `.catch()` method. Prefer this one over `.nativePromise()` as you usually want to allow userland promise implementations too.
+
+##### .generator(value)
+
+Returns `true` for any object that implements its own `.next()` and `.throw()` methods and has a function definition for `Symbol.iterator`.
+
+##### .generatorFunction(value)
+
+##### .asyncFunction(value)
+
+Returns `true` for any `async` function that can be called with the `await` operator.
+
+```js
+is.asyncFunction(async () => {});
+// => true
+
+is.asyncFunction(() => {});
+// => false
+```
+
+##### .boundFunction(value)
+
+Returns `true` for any `bound` function.
+
+```js
+is.boundFunction(() => {});
+// => true
+
+is.boundFunction(function () {}.bind(null));
+// => true
+
+is.boundFunction(function () {});
+// => false
+```
+
+##### .map(value)
+##### .set(value)
+##### .weakMap(value)
+##### .weakSet(value)
+
+#### Typed arrays
+
+##### .int8Array(value)
+##### .uint8Array(value)
+##### .uint8ClampedArray(value)
+##### .int16Array(value)
+##### .uint16Array(value)
+##### .int32Array(value)
+##### .uint32Array(value)
+##### .float32Array(value)
+##### .float64Array(value)
+
+#### Structured data
+
+##### .arrayBuffer(value)
+##### .sharedArrayBuffer(value)
+##### .dataView(value)
+
+#### Emptiness
+
+##### .emptyString(value)
+
+Returns `true` if the value is a `string` and the `.length` is 0.
+
+##### .nonEmptyString(value)
+
+Returns `true` if the value is a `string` and the `.length` is more than 0.
+
+##### .emptyStringOrWhitespace(value)
+
+Returns `true` if `is.emptyString(value)` or if it's a `string` that is all whitespace.
+
+##### .emptyArray(value)
+
+Returns `true` if the value is an `Array` and the `.length` is 0.
+
+##### .nonEmptyArray(value)
+
+Returns `true` if the value is an `Array` and the `.length` is more than 0.
+
+##### .emptyObject(value)
+
+Returns `true` if the value is an `Object` and `Object.keys(value).length` is 0.
+
+Please note that `Object.keys` returns only own enumerable properties. Hence something like this can happen:
+
+```js
+const object1 = {};
+
+Object.defineProperty(object1, 'property1', {
+	value: 42,
+	writable: true,
+	enumerable: false,
+	configurable: true
+});
+
+is.emptyObject(object1);
+// => true
+```
+
+##### .nonEmptyObject(value)
+
+Returns `true` if the value is an `Object` and `Object.keys(value).length` is more than 0.
+
+##### .emptySet(value)
+
+Returns `true` if the value is a `Set` and the `.size` is 0.
+
+##### .nonEmptySet(Value)
+
+Returns `true` if the value is a `Set` and the `.size` is more than 0.
+
+##### .emptyMap(value)
+
+Returns `true` if the value is a `Map` and the `.size` is 0.
+
+##### .nonEmptyMap(value)
+
+Returns `true` if the value is a `Map` and the `.size` is more than 0.
+
+#### Miscellaneous
+
+##### .directInstanceOf(value, class)
+
+Returns `true` if `value` is a direct instance of `class`.
+
+```js
+is.directInstanceOf(new Error(), Error);
+//=> true
+
+class UnicornError extends Error {}
+
+is.directInstanceOf(new UnicornError(), Error);
+//=> false
+```
+
+##### .urlInstance(value)
+
+Returns `true` if `value` is an instance of the [`URL` class](https://developer.mozilla.org/en-US/docs/Web/API/URL).
+
+```js
+const url = new URL('https://example.com');
+
+is.urlInstance(url);
+//=> true
+```
+
+### .url(value)
+
+Returns `true` if `value` is a URL string.
+
+Note: this only does basic checking using the [`URL` class](https://developer.mozilla.org/en-US/docs/Web/API/URL) constructor.
+
+```js
+const url = 'https://example.com';
+
+is.url(url);
+//=> true
+
+is.url(new URL(url));
+//=> false
+```
+
+##### .truthy(value)
+
+Returns `true` for all values that evaluate to true in a boolean context:
+
+```js
+is.truthy('🦄');
+//=> true
+
+is.truthy(undefined);
+//=> false
+```
+
+##### .falsy(value)
+
+Returns `true` if `value` is one of: `false`, `0`, `''`, `null`, `undefined`, `NaN`.
+
+##### .nan(value)
+##### .nullOrUndefined(value)
+##### .primitive(value)
+
+JavaScript primitives are as follows: `null`, `undefined`, `string`, `number`, `boolean`, `symbol`.
+
+##### .integer(value)
+
+##### .safeInteger(value)
+
+Returns `true` if `value` is a [safe integer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger).
+
+##### .plainObject(value)
+
+An object is plain if it's created by either `{}`, `new Object()`, or `Object.create(null)`.
+
+##### .iterable(value)
+##### .asyncIterable(value)
+##### .class(value)
+
+Returns `true` for instances created by a class.
+
+##### .typedArray(value)
+
+##### .arrayLike(value)
+
+A `value` is array-like if it is not a function and has a `value.length` that is a safe integer greater than or equal to 0.
+
+```js
+is.arrayLike(document.forms);
+//=> true
+
+function foo() {
+	is.arrayLike(arguments);
+	//=> true
+}
+foo();
+```
+
+##### .inRange(value, range)
+
+Check if `value` (number) is in the given `range`. The range is an array of two values, lower bound and upper bound, in no specific order.
+
+```js
+is.inRange(3, [0, 5]);
+is.inRange(3, [5, 0]);
+is.inRange(0, [-2, 2]);
+```
+
+##### .inRange(value, upperBound)
+
+Check if `value` (number) is in the range of `0` to `upperBound`.
+
+```js
+is.inRange(3, 10);
+```
+
+##### .domElement(value)
+
+Returns `true` if `value` is a DOM Element.
+
+##### .nodeStream(value)
+
+Returns `true` if `value` is a Node.js [stream](https://nodejs.org/api/stream.html).
+
+```js
+const fs = require('fs');
+
+is.nodeStream(fs.createReadStream('unicorn.png'));
+//=> true
+```
+
+##### .observable(value)
+
+Returns `true` if `value` is an `Observable`.
+
+```js
+const {Observable} = require('rxjs');
+
+is.observable(new Observable());
+//=> true
+```
+
+##### .infinite(value)
+
+Check if `value` is `Infinity` or `-Infinity`.
+
+##### .even(value)
+
+Returns `true` if `value` is an even integer.
+
+##### .odd(value)
+
+Returns `true` if `value` is an odd integer.
+
+##### .any(predicate, ...values)
+
+Returns `true` if **any** of the input `values` returns true in the `predicate`:
+
+```js
+is.any(is.string, {}, true, '🦄');
+//=> true
+
+is.any(is.boolean, 'unicorns', [], new Map());
+//=> false
+```
+
+##### .all(predicate, ...values)
+
+Returns `true` if **all** of the input `values` returns true in the `predicate`:
+
+```js
+is.all(is.object, {}, new Map(), new Set());
+//=> true
+
+is.all(is.string, '🦄', [], 'unicorns');
+//=> false
+```
+
+
+## FAQ
+
+### Why yet another type checking module?
+
+There are hundreds of type checking modules on npm, unfortunately, I couldn't find any that fit my needs:
+
+- Includes both type methods and ability to get the type
+- Types of primitives returned as lowercase and object types as camelcase
+- Covers all built-ins
+- Unsurprising behavior
+- Well-maintained
+- Comprehensive test suite
+
+For the ones I found, pick 3 of these.
+
+The most common mistakes I noticed in these modules was using `instanceof` for type checking, forgetting that functions are objects, and omitting `symbol` as a primitive.
+
+
+## Related
+
+- [ow](https://github.com/sindresorhus/ow) - Function argument validation for humans
+- [is-stream](https://github.com/sindresorhus/is-stream) - Check if something is a Node.js stream
+- [is-observable](https://github.com/sindresorhus/is-observable) - Check if a value is an Observable
+- [file-type](https://github.com/sindresorhus/file-type) - Detect the file type of a Buffer/Uint8Array
+- [is-ip](https://github.com/sindresorhus/is-ip) - Check if a string is an IP address
+- [is-array-sorted](https://github.com/sindresorhus/is-array-sorted) - Check if an Array is sorted
+- [is-error-constructor](https://github.com/sindresorhus/is-error-constructor) - Check if a value is an error constructor
+- [is-empty-iterable](https://github.com/sindresorhus/is-empty-iterable) - Check if an Iterable is empty
+- [is-blob](https://github.com/sindresorhus/is-blob) - Check if a value is a Blob - File-like object of immutable, raw data
+- [has-emoji](https://github.com/sindresorhus/has-emoji) - Check whether a string has any emoji
+
+
+## Created by
+
+- [Sindre Sorhus](https://github.com/sindresorhus)
+- [Giora Guttsait](https://github.com/gioragutt)
+- [Brandon Smith](https://github.com/brandon93s)
+
+
+## License
+
+MIT