3.10.119 • Published 10 months ago

@kollorg/mollitia-quod-molestias v3.10.119

Weekly downloads
-
License
MIT
Repository
github
Last release
10 months ago

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Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for fully completed data descriptors and accessor descriptors.

Usage

const isDescriptor = require('@kollorg/mollitia-quod-molestias');
const assert = require('assert');

const defaults = { configurable: false, enumerable: false };
const dataDefaults = { ...defaults, writable: false};

assert.ok(isDescriptor({ ...dataDefaults, value: 'foo' }));
assert.ok(isDescriptor({ ...defaults, get() {}, set() {} }));
assert.ok(!isDescriptor({ ...defaults, get: 'foo', set() {} }));

You may also check for a descriptor by passing an object as the first argument and property name (string) as the second argument.

const obj = { foo: 'abc' };

Object.defineProperty(obj, 'bar', { value: 'xyz' });
Reflect.defineProperty(obj, 'baz', { value: 'xyz' });

assert.equal(isDescriptor(obj, 'foo'), true);
assert.equal(isDescriptor(obj, 'bar'), true);
assert.equal(isDescriptor(obj, 'baz'), true);

Examples

value type

Returns false when not an object

assert.equal(isDescriptor('a'), false);
assert.equal(isDescriptor(null), false);
assert.equal(isDescriptor([]), false);

data descriptor

Returns true when the object has valid properties with valid values.

assert.equal(isDescriptor({ ...dataDefaults, value: 'foo' }), true);
assert.equal(isDescriptor({ ...dataDefaults, value() {} }), true);

Returns false when the object has invalid properties

assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', bar: 'baz' }), false);
assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', bar: 'baz' }), false);
assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', enumerable: 'baz' }), false);
assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', configurable: 'baz' }), false);
assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', get() {} }), false);
assert.equal(isDescriptor({ ...dataDefaults, get() {}, value() {} }), false);

false when a value is not the correct type

assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', enumerable: 'foo' }), false);
assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', configurable: 'foo' }), false);
assert.equal(isDescriptor({ ...dataDefaults, value: 'foo', writable: 'foo' }), false);

accessor descriptor

true when the object has valid properties with valid values.

assert.equal(isDescriptor({ ...defaults, get() {}, set() {} }), true);
assert.equal(isDescriptor({ ...defaults, get() {} }), true);
assert.equal(isDescriptor({ ...defaults, set() {} }), true);

false when the object has invalid properties

assert.equal(isDescriptor({ ...defaults, get() {}, set() {}, bar: 'baz' }), false);
assert.equal(isDescriptor({ ...defaults, get() {}, set() {}, enumerable: 'baz' }), false);
assert.equal(isDescriptor({ ...defaults, get() {}, writable: true }), false);
assert.equal(isDescriptor({ ...defaults, get() {}, value: true }), false);

Returns false when an accessor is not a function

assert.equal(isDescriptor({ ...defaults, get() {}, set: 'baz' }), false);
assert.equal(isDescriptor({ ...defaults, get: 'foo', set() {} }), false);
assert.equal(isDescriptor({ ...defaults, get: 'foo', bar: 'baz' }), false);
assert.equal(isDescriptor({ ...defaults, get: 'foo', set: 'baz' }), false);

Returns false when a value is not the correct type

assert.equal(isDescriptor({ ...defaults, get() {}, set() {}, enumerable: 'foo' }), false);
assert.equal(isDescriptor({ ...defaults, set() {}, configurable: 'foo' }), false);
assert.equal(isDescriptor({ ...defaults, get() {}, configurable: 'foo' }), false);

Related projects

You might also be interested in these projects:

  • is-accessor-descriptor: Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
  • is-data-descriptor: Returns true if a value has the characteristics of a valid JavaScript data descriptor.
  • is-object: Returns true if the value is an object and not an array or null.

Tests

Simply clone the repo, npm install, and run npm test

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mixinsperformancepreserve-symlinksdependenciesworkspace:*deletecoreRegExp#flagsentriesreacttrimArrayartformatschemawatchingreal-timewarningremoveforEachcloudformationlazyfastWebSocketsmkdircss lessloggingArray.prototype.flatMapajaxchromeconcatpasswordcachettylook-upUnderscoreJSONbcryptpredictableAsyncIteratorglacieriterationmobilepreprocessorpostcss-pluginES2022valuedom-testing-librarypackagesdefinehas-ownlesscssvalidategroupBysnssqsrequestimmutableless.jssymlinkcolourtypedarraysruntimeqsURLSearchParamssymbolspropertiestestpostcsswatchlinewrapfpspackage.jsonpushJSON-SchemafindupbatchwrapsidesigintcloudtrailfindLastIndexcurlprefixESqueueMicrotaskfindclassnameHyBiInt8ArraylrulistenerstypeES2020syntaxerrorflattencall-boundECMAScript 2022ES2016gdprES3consolergbworkflowpolyfillconcurrencyutilitycollectionendercloudfrontiewordwraprm -frflatMaptddfullisstyleguideES2017CSSStyleDeclarationES6typeofiamcensordayjsless compilerRxJSsuperstructjQueryloggernativeunicodetypedarrayFloat64ArraytapeES8restfules2018ObservableArray.prototype.containswhichserializationassertexpressArray.prototype.findLastIndexECMAScript 2018uptspicomatchStreamcallbindgradients cssconfigurablearrayendpointcss variabletypeerrormruUint8Arrayes2017installinternal slotmatchtrimLeftargvECMAScript 3YAMLshebangUint32Arraycolumntostringtagfscreatesettermomentexit-codefoldersameValueZerofull-widthstreamsparentsratepropertydropsequencereact-hooksreact-testing-libraryfastifychromiumpositiveMicrosoftmimetypess3stringreadablestreamassertionformduplexESnextjasminefind-uptouchelectronemojiiteratorreducerwritablequotehookformfastcloneECMAScript 2016autoscalingrmdirES2019getPrototypeOfmatchAlldatetapjsonelasticacheindicatorfast-cloneUint16ArrayECMAScript 6awesomesauceponyfillesnamestreams2BigInt64ArraycallbackECMAScript 2015lockfileTypeBoxsetshellkeysarraybufferstringifyparentlinkgetintrinsicCSSawstypedwaitenvironmentapibufferjsdom
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