Determine type of a variable
All the functions from core-util-is plus a few extras, in both CJS and ESM formats for use in Node.js or browser.
Usage
Import
const { isString } = require('is-it-type');
or:
import { isString } from 'is-it-type';
Use a method
isString('abc'); // true
All methods return true
or false
.
Methods
core-util-is:
Same asisArray
isBoolean
isNull
isNullOrUndefined
isNumber
isString
isSymbol
isUndefined
isRegExp
isDate
isError
isFunction
isPrimitive
NB core-util-is's isBuffer
is not included. isObject
method differs from core-util-is's method of same name (see below).
Additional functions
Strings
-
isEmptyString
-true
if=== ''
-
isFullString
-true
if a string which!== ''
Numbers
-
isInteger
-true
if is an integer number (positive, negative or zero) -
isPositiveInteger
-true
if is an integer number > 0 -
isPositiveIntegerOrZero
-true
if is an integer number >= 0 -
isNegativeInteger
-true
if is an integer number < 0 -
isNegativeIntegerOrZero
-true
if is an integer number <= 0
Objects
-
isObject
-true
if passed object (not including arrays, regexps and other built-ins) -
isEmptyObject
-true
if passed object with no properties
Other
-
isType( type, input )
-true
iftypeof input === type
Versioning
This module follows semver. Breaking changes will only be made in major version updates.
All active NodeJS release lines are supported (v12+ at time of writing). After a release line of NodeJS reaches end of life according to Node's LTS schedule, support for that version of Node may be dropped at any time, and this will not be considered a breaking change. Dropping support for a Node version will be made in a minor version update (e.g. 1.2.0 to 1.3.0). If you are using a Node version which is approaching end of life, pin your dependency of this module to patch updates only using tilde (~
) e.g. ~1.2.3
to avoid breakages.
Tests
Use npm test
to run the tests. Use npm run cover
to check coverage.
Changelog
See changelog.md
Issues
If you discover a bug, please raise an issue on Github. https://github.com/overlookmotel/is-it-type/issues
Contribution
Pull requests are very welcome. Please:
- ensure all tests pass before submitting PR
- add tests for new features
- document new functionality/API additions in README
- do not add an entry to Changelog (Changelog is created when cutting releases)