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110 packages found
Type check values
Function argument validation for humans
- type
- types
- check
- checking
- guard
- guards
- assert
- assertion
- predicate
- predicates
- is
- validate
- validation
- utility
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Enhances a JavaScript class by adding an is<Class> property to compare types between realms.
A tiny javascript type testing tool
Determine the name of a value's constructor.
Test if a value is a regular expression.
- stdlib
- stdassert
- assertion
- assert
- utilities
- utility
- utils
- util
- valid
- validate
- regular expression
- regexp
- regex
- is
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Tests to see if the prototype property of a constructor appears anywhere in the prototype chain of an value.
- instanceof
- instof
- inst-of
- instance-of
- is-instance
- is-instance-of
- instances
- classof
- class-of
- kind
- is-kind
- is-kind-of
- constructor
- memberof
Check if a value is an `Error` instance
- browser
- cross-realm
- dom
- error
- error-handle
- error-handler
- error-handlers
- error-handling
- error-monitoring
- error-reporting
- errors
- exception
- exception-handling
- instanceof
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Define errors without frills, but with stack traces and instanceof support.
Test whether a value has in its prototype chain a specified constructor as a prototype property.
- stdlib
- stdassert
- assertion
- assert
- utilities
- utility
- utils
- util
- prototype
- proto
- inherit
- inherits
- class
- oop
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Get the type of something. Seriously.
Create custom JavaScript errors that also match instanceof.
Extended JavaScript Type Validator
Implement prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.
- stdlib
- stdutils
- stdutil
- utilities
- utility
- utils
- util
- prototype
- inherit
- inherits
- class
- oop
- object-oriented
- inheritance
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Get the type of something. Seriously.
compare the type of your value with one or several types
- typeof
- types
- instanceof
- type-of
- test
- check
- typeof-in
- string
- constructor
- name
- number
- object
- array
- function
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Utilities to get and check variable types (isString, isPlainObject, isRegExp, etc)
- array
- assert
- assertion
- async
- async function
- async-function
- asyncFunction
- bool
- boolean
- browser
- check
- check-type
- checking
- class
- View more
`modern-errors` plugin to execute class-specific logic
- catch
- class
- classes
- errors
- inheritance
- instanceof
- javascript
- library
- mapping
- message
- modern-errors
- modern-errors-plugin
- nodejs
- plugins
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Allows runtime-check that object implements an interface (missing functionality in TypeScript)