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https://github.com/node-modules/is-type-of
complete type checking for node
https://github.com/node-modules/is-type-of
Last synced: about 2 months ago
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complete type checking for node
- Host: GitHub
- URL: https://github.com/node-modules/is-type-of
- Owner: node-modules
- License: mit
- Created: 2014-03-11T16:43:47.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2023-12-08T12:33:41.000Z (10 months ago)
- Last Synced: 2024-04-14T12:21:34.348Z (5 months ago)
- Language: TypeScript
- Homepage:
- Size: 61.5 KB
- Stars: 122
- Watchers: 13
- Forks: 13
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
- awesome-nodejs - is-type-of - Complete type checking for node.  (Repository / Check/Detect)
README
# is-type-of
Complete type checking for Node
## Features
- 🔒 Useful Type Checking，including Primitive, Standard Object, Node Object
- ✨ Typescript Support
- 🚪 Typescript Type Guard Support
## Install
```bash
npm install is-type-of
```
## Usage
Use ES Module import
```typescript
import is from 'is-type-of';
import { isArray } from 'is-type-of';
isArray([]); // => true
is.array([]); // => true
```
Compatible With
```javascript
const is = require('is-type-of');
is.array([1]); // => true
is.primitive(true); // => true
is.primitive({}); // => false
is.generatorFunction(function * () {}); // => true
is.long(Math.pow(2, 33)); // => true
is.double(0); // => false
```
Use Type Guard
```typescript
import { isArray } from 'is-type-of';
function checkArray(arr: string[] | string) {
// => parameter) arr: string | string[]
if (isArray(arr)) {
// => (parameter) arr: string[]
arr.forEach(console.log);
}
}
```
## API Document
### Primitive
#### isString
Returns true if `val` is string, not `String` object.
See Also `is.string`
#### isNumber
Returns true if `val` is number, not `Number` object.
See Also `is.number`
#### isBoolean
Returns true if `val` is boolean, not `Boolean` object.
See Also `is.boolean`
#### isBigInt
Returns true if `val` is bigint.
See Also `is.bigInt`
#### isSymbol
Returns true if `val` is symbol.
See Also `is.symbol`
#### isUndefined
Returns true if `val` is undefined.
See Also `is.undefined`
#### isNull
Returns true if `val` is null.
See Also `is.null`
#### isNullable
Returns true if `val` is null or undefined.
See Also `is.nullable`
#### isPrimitive
Returns true if `val` is primitive.
See Also `is.primitive`
#### isInteger
Returns true if `val` is integer.
See Also `is.integer`
#### isInteger32
Returns true if `val` is integer, and between `-2 ** 31` and `2 ** 31 - 1`.
See Also `is.integer32`
#### isLong
Returns true if `val` is integer, and < `-2 ** 31`, and > `2 ** 31 - 1`.
See Also `is.long`
#### isSafeInteger
Returns true if `val` is integer, and between `-(2 ** 53 - 1)` and `2 ** 53 - 1`.
See Also `is.safeInteger`
#### isDouble
Returns true if `val` is Double.
See Also `is.double`
#### isNaN
Returns true if `val` is NaN.
See Also `is.NaN`
#### isFinite
Returns true if `val` is finite.
See Also `is.finite`
### Standard Object
# API Documentation
#### isArray
Returns true if `val` is array, it won't check items of array.
See Also `is.array`
#### isFunction
Returns true if `val` is function.
See Also `is.function`
#### isGeneratorFunction
Returns true if `val` is generator function.
See Also `is.generatorFunction`
#### isAsyncFunction
Returns true if `val` is async function.
See Also `is.asyncFunction`
#### isAsyncGeneratorFunction
Returns true if `val` is async generator function.
See Also `is.asyncGeneratorFunction`
#### isObject
Returns true if `val` is object.
See Also `is.object`
#### isClass
Returns true if `val` is class.
**Note:** "class" is supported in ECMAScript 6, and if the code is using some compiler or transpiler, the checking might fail.
See Also `is.class`
#### isRegExp
Returns true if `val` is regular expression.
See Also `is.regExp`
#### isDate
Returns true if `val` is instance of Date.
See Also `is.date`
#### isError
Returns true if `val` is instance of Error.
See Also `is.error`
#### isGenerator
Returns true if `val` is generator.
See Also `is.generator`
#### isPromise
Returns true if `val` is promise.
See Also `is.promise`
#### isPromiseLike
Returns true if `val` is like promise, if the object has `then` property, the checking will pass.
See Also `is.promiseLike`
### Node Object
#### isBuffer
Returns true if `val` is buffer.
See Also `is.buffer`
#### isStream
Returns true if `val` is stream.
See Also `is.stream`
#### isReadable
Returns true if `val` is readable stream.
See Also `is.readable`
#### isWritable
Returns true if `val` is write stream.
See Also `is.writable`
#### isDuplex
Returns true if `val` is duplex stream.
See Also `is.duplex`
### External Object
#### isLongObject
returns true if val is LongObject
LongObject is from npm package [long](https://github.com/dcodeIO/long.js)
See Also `is.longObject`
## Thanks
- [core-util-is](https://github.com/isaacs/core-util-is)
- [is-stream](https://github.com/rvagg/isstream)
- [is-class](https://github.com/miguelmota/is-class)
## License
[MIT](LICENSE)