42 packages found
Description
Isomorphic, functional type-checking for Javascript
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A logic Utility. Nil is: null or undefined. Make writing node easier, prettier and less error prone. Writes and reads more like prose
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checks if foo is not defined, i.e. undefined, null, an empty string, array, object or NaN
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ensures all required parameters are not null, or throws a useful error like 'phone is required'
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Simple utility function for checking isDefined for complex objects with long property paths
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util for validation that object has defined props
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Check if a variable in a nested object is defined and optionally also check its type. Useful for verifying API responses.
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A robust micro library for type checking. Defers to constructs' internal `[[Class]]` property rather than duck typing for excellent type detection and to avoid triggering false positives.
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Assert that the passed arguments are defined.
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Finds the absolute filepath to the original sourcecode of any defined value
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checks if your properties or values are defined
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A lightweight stream-like maybe/or else monad for typescript. `maybe(val).valueOr(other)` grant you no unexpected undefined and hence allows you to write you TS-code in a more fluid way, skipping some of those if-else nestings.
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Common types, type guards and type checkers.
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- array
- bigint
- boolean
- check
- defined
- determine
- function
- guard
- instance
- key
- propertyKey
- number
- object
- primitive
- View more
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A utility function for extracting defined values from an object.
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A minimalistic boilerplate to wait for Custom Elements, or libraries, definition
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Check if value is defined
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Clone of PHP's function 'defined'
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Safe chaining of object properties and functions using ES2015 Proxy.
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Check if an identifier is defined
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checks if foo is not defined, i.e. undefined, null, an empty string, array, object or NaN