Descriptor

Working with PropertyDescriptor objects requires some inner knowledge on which settings go together and which are mutually exclusive. This package deals with those mechanics and provides more robust type hinting for TypeScript users.

Installation

npm install --save @konfirm/descriptor

Or use your favorite package manager to install @konfirm/descriptor

API

Exports

name	description
Descriptor	TypeScript type alias for one of: DataDescriptor, GetterAccessorDescriptor or ValueAccessorDescriptor
isDescriptor	type guard which validates the input to be a Descriptor type
DataDescriptor	TypeScript type alias describing {enumerable?:boolean, configurable?: boolean}
isDataDescriptor	type guard which validates the input to be a DataDescriptor type
GetterAccessorDescriptor	TypeScript type alias describing {enumerable?:boolean, configurable?: boolean, get: Function, set?: Function}
isGetterAccessorDescriptor	type guard which validates the input to be a GetterAccessorDescriptor type
ValueAccessorDescriptor	TypeScript type alias describing {enumerable?:boolean, configurable?: boolean, value: any, writable: boolean}
isValueAccessorDescriptor	type guard which validates the input to be a ValueAccessorDescriptor type
DescriptorMapper	A convenience descriptor mapper

//const { isDescriptor } = require('@konfirm/descriptor');
import { isDescriptor } from '@konfirm/descriptor';

console.log(isDescriptor({ value: 'hello' })); // true
console.log(isDescriptor({ nope: 'hello' }));  // false

DescriptorMapper

Intended to do the heavy lifting for merging Descriptor object, maintaining a valid combination of settings at all times

//const { DescriptorMapper } = require('@konfirm/descriptor');
import { DescriptorMapper } from '@konfirm/descriptor';

const one = { value: 'a value', writable: false };
const two = { get: () => 'getter', enumerable: true };

const oneAndTwo = DescriptorMapper.merge(one, two); // { get, enumerable };
const twoAndOne = DescroptorMapper.merge(two, one); // { value, writable, enumerable }

Methods

name	parameters	description
merge	...Descriptor	Merges any number of desciptors into one
omit	Descriptor, ...string key	Create a new object without one or more keys from a descriptor
only	Descriptor, ...string key	Create a new object with only the specified keys

License

MIT License Copyright (c) 2021 Rogier Spieker (Konfirm)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.