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How to use isNullPrototype method in fast-check-monorepo
Best JavaScript code snippet using fast-check-monorepo
underpin.js
Source:underpin.js 
...50api.isString = (s) => (typeof s === 'string' || s instanceof String)51api.isNumber = api.isType('Number')52api.isDate = api.isType('Date')53api.isError = api.isType('Error')54api.isPlainObject = (o) => api.isObject(o) && (Reflect.getPrototypeOf(o) === Object.prototype || isNullPrototype(o))55api.isRegExp = api.isType('RegExp')56api.isSymbol = api.isType('Symbol')57api.isSet = api.isType('Set')58api.isMap = api.isType('Map')59api.isMatch = (o, src) => api.matches(src)(o)60api.conformsTo = api.isMatch //alias to isMatch61api.isArrayLike = (o) => o != null && typeof o !== 'function' && api.isLength(o.length) // Exploit: should test isArr or isStr???62api.isNaN = (v) => Number.isNaN(v)63api.isNil = (o) => o === undefined || o === null64api.isNull = (o) => o === null65api.isIterable = (o) => o != null && typeof o[Symbol.iterator] === 'function'66api.isLength = (len) => typeof len === 'number' && len > -1 && len % 1 == 0 && len <= Number.MAX_SAFE_INTEGER67api.isEmpty = (o) => !api.size(o)68api.isUndefined = (o) => o === undefined69api.toArray = (o) => {70 //if (api.isArray(o)) return api.concat(o) // make copy as Lodash?71 if (api.isArray(o)) return o // or passthrough?72 if (api.isString(o)) return o.split('')73 if (api.isSet(o)) return [...o]74 if (api.isObject(o)) return Object.values(o)75 return []76}77api.toString = (o) => {78 if (api.isNil(o)) return ''79 if (api.isString(o)) return o80 if (isNullPrototype(o)) return '[Object: null prototype]'81 return o + ''82}83api.toNumber = (v) => (typeof v == 'number') ? v : +v;84api.toInteger = (v) => {85 if (api.isNil(v)) return 086 if (v === Infinity) return Number.MAX_VALUE // Should be Number.MAX_SAFE_INTEGER87 if (v === -Infinity) return Number.MIN_SAFE_INTEGER // Lodash return different but not Number.MIN_VALUE88 if (api.isNaN(api.toNumber(v))) return 089 return Math.floor(v)90}91api.eq = (v1, v2) => v1 === v2 || (v1 !== v1 && v2 !== v2) // NaN, NaN => true92api.gt = (v1, v2) => v1 > v293api.gte = (v1, v2) => isStrings(v1, v2) ? api.toNumber(v1) >= api.toNumber(v2) : v1 >= v2 // Object is string?94api.lt = (v1, v2) => v1 < v295api.lte = (v1, v2) => isStrings(v1, v2) ? api.toNumber(v1) <= api.toNumber(v2) : v1 <= v2 // Object is string?96/* Array ************************************/97api.chunk = (a, size = 1) => {98 if (!api.isNumber(size) || size < 1 ) return []99 const arr = api.toArray(a)100 const n = Math.ceil(arr.length / size)101 const res = Array(n);102 for (let i = 0; i < n; i++) res[i] = arr.slice((i*size), (i*size+size))103 return res104}105api.concat = (a, ...rest) => api.isArray(a) ? a.concat(...rest) : api.castArray(a).concat(...rest)106api.compact = (a) => api.isArrayLike(a) ? api.toArray(a).reduce( (acc, v) => (!v) ? acc : api.push(acc,v), []) : []107api.difference = (a1,a2) => {108 const set = toSet(api.isArray(a2) ? a2 :[]);109 return (api.isArray(a1) ? a1 :[]).filter( v => !set.has(v))110}111api.drop = (arr, n = 1) => api.slice(arr,n)112api.dropWhile = (a, p) => {113 if (!p) return [];114 const arr = api.toArray(a);115 return arr.slice(countWhile(arr,p))116}117api.flatten = (a) => api.isArrayLike(a) ? api.toArray(a).flat() : []118api.fromPairs = (a) => api.toArray(a).reduce((obj, p) => api.tap(obj, (o)=> o[p[0]] = p[1]),{})119api.head = (a) => api.isArrayLike(a) ? api.toArray(a)[0] : undefined120api.first = api.head121api.intersection = (a1,a2) => {122 const set = toSet(a2);123 return (a2) ? api.toArray(a1).filter( v => set.has(v)) : api.toArray(a1)124}125api.join = (a, c = ',') => api.toArray(a).join(c);126api.last = (a) => {127 if (!api.isArrayLike(a)) return undefined128 const arr = api.toArray(a)129 return arr[arr.length-1]130}131api.reverse = (a) => {132 if (api.isArray(a)) return a.reverse()133 if (api.isString(a)) return api.join(api.toArray(a).reverse(),'')134 return a135}136api.slice = (a, from, until) => api.toArray(a).slice(from, until);137api.tail = (a) => api.slice(a,1);138api.union = (a1,a2) => api.uniq(api.concat(api.toArray(a1),api.toArray(a2)))139api.uniq = (a) => [...toSet(a)]140api.xor = (a1,a2) => api.concat(api.difference(a1,a2), api.difference(a2,a1))141api.zipObject = (a1,a2) => {142 const a2Arr = api.toArray(a2)143 return api.toArray(a1).reduce((o,k,i) => {144 if (isUnsafeKey(k)) return o;145 o[k] = a2Arr[i];146 return o147 }, {})148}149/* Collection ********************************/150api.forEach = (a, f) => {151 if (!api.isFunction(f)) return a;152 if (api.isArrayLike(a)) { api.toArray(a).forEach((v,i)=>f(v,i,a)); return a }153 if (api.isSet(a)) { const aSet = api.toArray(a); aSet.forEach((v,i)=>f(v,i, aSet)); return a }154 if (api.isObject(a)) { api.keys(a).forEach((k)=>f(a[k],k,a)); return a }155 return a156}157api.filter = (a,f) => api.toArray(a).filter(api.iteratee(f))158api.find = (a,f) => api.toArray(a).find(api.iteratee(f))159api.groupBy = (a, f) => api.reduce(api.toArray(a), (o,v) => {160 const k = api.iteratee(f)(v)161 api.isArray(o[k]) ? o[k].push(v) : o[k] = [v];162 return o163}, {})164api.includes = (a, v) => {165 if (api.isArrayLike(a) ) return a.includes(v)166 if (api.isSet(a)) return a.has(v)167 if (api.isObject(a)) return api.toArray(a).includes(v)168 return false169}170api.map = (a, f) => {171 if (api.isArrayLike(a)) return api.toArray(a).map(api.iteratee(f))172 if (api.isObject(a)) return api.values(api.mapValues(a, api.iteratee(f)))173 return []174}175api.orderBy = (a, ...args) => api.sortBy(a, ...args )176api.reduce = (a, f, init) => {177 if (api.isArray(a) || api.isSet(a)) return api.toArray(a).reduce(api.iteratee(f), init)178 if (api.isString(a)) return api.toArray(a).reduce((acc,char,i)=> api.iteratee(f)(acc,char,i,a), init)179 if (api.isObject(a)) return api.keys(a).reduce((acc,key)=> api.iteratee(f)(acc,a[key],key,a), init)180 return init181}182api.discard = (a,f) => api.toArray(a).filter(api.negate(api.iteratee(f))) // renamed to avoid promise confusion183api.size = (a) => {184 if (api.isArrayLike(a)) return a.length185 if (api.isSet(a) || api.isMap(a)) return a.size186 if (api.isObject(a)) return api.keys(a).length187 return 0188}189api.sortBy = (a, ...args) => api.isArray(a) ? api.concat(a).sort(api.by(...args)) : []190/* Date **************************************/191api.hours = (len = 1) => {192 const d = new Date();193 const h = Math.max(1, Math.min(24, api.toInteger(len)))194 d.setHours(Math.floor(d.getHours() / h) * h, 0, 0, 0);195 return api.toEpoch(d)196}197api.isToday = (d) => {198 const e = api.toEpoch(d);199 return (e >= api.today() && e < api.tomorrow())200}201api.minutes = (len = 1) => {202 const d = new Date();203 const m = Math.max(1, Math.min(60, api.toInteger(len)))204 d.setHours(d.getHours(), Math.floor(d.getMinutes() / m ) * m, 0, 0);205 return api.toEpoch(d)206}207api.now = () => Date.now()208api.toDate = (...args) => {209 const d = args[0]210 if (api.isDate(d)) return d;211 if (api.toLower(d) == 'today') return new Date(api.today())212 if (api.toLower(d) == 'now') return new Date(api.now()) // dangerous tets, clock may have had tome to tick213 if (api.toLower(d) == 'tomorrow') return new Date(api.tomorrow())214 const date = (args.length === 0) ? new Date() : new Date(...args)215 return (api.isNaN(date.valueOf())) ? new InvalidDate(date) : date216}217api.toEpoch = (d) => Number(api.toDate(d))218api.today = () => new Date().setHours(0,0,0,0) //TODO: setHours vs setUTCHours must be defined219api.toISOString = (d) => api.toDate(d).toISOString()220api.tomorrow = () => api.today() + 24 * 3600 * 1000221/* Function **********************************/222api.negate = (predicate) => (...args) => !( api.isFunction(predicate) ? predicate(...args): api.identity(...args) )223api.memoize = (f, keyResolver) => {224 const config = api.isFunction(keyResolver) ? {resolver: keyResolver} : api.isObject(keyResolver) ? keyResolver : {}225 const {resolver = api.identity, capacity = Math.pow(2, 24), lru = false } = config226 const max = (api.toInteger(capacity) > 0 ) ? api.toInteger(capacity) : Math.pow(2, 24) // Cache of 0 size, is not a cache227 const getKey = api.isFunction(resolver) ? resolver : api.identity228 const cache = new Map()229 const memoized = (...args) => {230 const key = getKey(...args)231 let value = cache.get(key);232 if (value === undefined && !cache.has(key)) {233 // not in cache, call f to get value234 value = f(...args)235 // manage cache size236 if (cache.size >= max) {237 lru ? cache.delete(cache.keys().next().value) : cache.clear()238 }239 if (api.isPromise(value)) {240 // promise value, return a proxy promise241 return new Promise((resolve, reject) => {242 Promise.resolve(value)243 .then((v) => {244 cache.set(key, Promise.resolve(v))245 resolve(v)246 })247 .catch(reject)248 })249 } else {250 // Non promise value251 cache.set(key, value)252 return value253 }254 } else {255 // Found in cache. If in lru mode, make "youngest"256 if (lru) {257 cache.delete(key)258 cache.set(key, value)259 }260 return value261 }262 }263 memoized.cache = cache264 return memoized265}266/* Math **************************************/267api.max = (a) => {268 if (!api.isArrayLike(a) || api.isEmpty(a)) return undefined269 return api.reduce(a, (v1, v2) => api.compareValues(v1,v2, true) <= 0 ? v1 : v2)270}271api.maxBy = (a, src) => {272 if (!api.isArrayLike(a) || api.isEmpty(a)) return undefined273 return api.reduce(a, (v1, v2) => api.compareValues(api.iteratee(src)(v1), api.iteratee(src)(v2), true) <= 0 ? v1 : v2)274}275api.mean = (a) => (!api.isArrayLike(a) || api.isEmpty(a)) ? NaN : (api.sum(a) / a.length)276api.meanBy = (a, src) => api.mean(api.map(a, src))277api.min = (a) => {278 if (!api.isArrayLike(a) || api.isEmpty(a)) return undefined279 return api.reduce(a, (v1, v2) => api.compareValues(v1,v2, false) <= 0 ? v1 : v2)280}281api.minBy = (a, src) => {282 if (!api.isArrayLike(a) || api.isEmpty(a)) return undefined283 return api.reduce(a, (v1, v2) => api.compareValues(api.iteratee(src)(v1), api.iteratee(src)(v2), false) <= 0 ? v1 : v2)284}285api.sum = (a) => {286 if (!api.isArrayLike(a) || api.isEmpty(a)) return 0287 return api.reduce(a, (sum, v) => (v === undefined) ? sum : ((sum === undefined)? v : sum+v) , undefined)288}289api.sumBy = (a, src) => api.sum(api.map(a, src))290/* Number ************************************/291api.inRange = (number, start, end) => {292 const n = api.toNumber(number);293 if (!api.isNumber(n) || api.isNil(start)) return false;294 return (api.isNil(end)) ? (n >= 0 && n < start) :295 (end < start) ? (n >= end && n < start) :296 (n >= start && n < end)297}298/* Object ************************************/299api.assign = (dest, ...objects) => {300 //if (api.isNil(src)) return {};301 const result = api.isObject(dest) ? dest : {};302 api.castArray(objects).forEach((o) => {303 if (!api.isObject(o)) return304 const keys = api.keys(o)305 if (hasUnsafeKeys(keys)) {306 // Slow copy to avoid potential "evil"...307 keys.forEach( (key)=> {308 if (isUnsafeKey(key)) return309 Object.assign(result, {[key]: o[key]})310 })311 } else {312 Object.assign(result, o)313 }314 })315 return result;316}317api.get = (o, p) => {318 if (api.isNil(p) || api.isNil(o)) return undefined319 return hasDotOrArrayStartOrEnd(p) ? api.toPath(p).reduce((a, v) => a ? a[v] : a , o ) : o[p]320}321api.has = (o, p) => {322 if (api.isNil(p) || api.isNil(o) || isNullPrototype(o)) return false323 if ( hasDotOrArrayStartOrEnd(p) ) {324 return !!(api.toPath(p).reduce((a, v) => !hasProperty(a, v) ? false : api.isObject(a[v]) ? a[v] : true, o)) // can be optimized325 } else {326 return o.hasOwnProperty(p)327 }328}329api.keys = (o) => api.isString(o)? api.range(o.length).map(v=> api.toString(v)): api.isObject(o) ? Object.keys(o) : []330api.keysIn = (o) => api.tap([], (keys) => {331 for (let key in o) keys.push(key)332})333api.mapKeys = (o, f) => {334 return api.reduce(api.keys(o), (obj,k)=> {335 const value = o[k]336 const key = api.isFunction(f) ? f(k, value, o) || k : api.isObject(f) ? api.result(f, k, k) || k : k337 return isUnsafeKey(key) ? Object.assign(obj, { [k]: value } ) : Object.assign(obj, { [key]: value } )338 }, {})339}340api.mapValues = (o, f) => {341 return api.reduce(api.keys(o), (obj,k,i)=> {342 const v = o[k]343 const value = api.isFunction(f) ? f(v ,k, o) :344 api.isString(f) ? api.get(v, f) :345 api.isObject(f) ? api.result(f, k, v) :346 v347 return isUnsafeKey(k) ? obj : Object.assign(obj, { [k]: value } )348 }, {})349}350api.pick = (o, a0, ...args) => {351 if (api.isNil(o) || api.isFunction(o) || api.isArray(o)) return {}352 const keys = api.isArray(a0) ? a0 : [a0, ...args]353 const result = {}354 keys.forEach(key => api.set(result, key, api.get(o,key)))355 return result;356}357api.pickBy = (o, f ) => {358 const predicate = api.isFunction(f) ? f : api.identity359 return api.reduce(api.keys(o), (a,k) => {360 return predicate(o[k],k) ? api.set(a, k, api.get(o,k)) : a361 }, {})362}363api.result = (o, p, def) => {364 const v = api.get(o,p);365 const defaultValue = api.isFunction(def) ? def(v) : def366 return api.isFunction(v) ? v(def) : (v !== undefined) ? v : defaultValue;367}368api.set = (o , p , v) => {369 if (api.isNil(o)) return o370 api.toPath(p).reduce((obj, prop, index, path) => {371 if (isUnsafeKey(prop) || api.isNil(obj)) return undefined372 if (index === (path.length - 1)) return obj[prop] = v // end of path, set value373 if (api.has(obj, prop) && (api.isObject(obj[prop]) || api.isArray(obj[prop]))) return obj[prop] // already has arr or obj on this path, return prop374 return api.isNaN(api.toNumber(path[index + 1])) ? obj[prop]={} : obj[prop]=[] // look ahead to know if to create object or array375 } , o)376 return o377}378api.toPairs = (o) => api.keys(o).map( (k, i) => [k, o[k]]);379api.toPairsIn = (o) => api.keysIn(o).map( (k, i) => [k, o[k]]);380api.toPlainObject = (o) => api.fromPairs(api.toPairsIn(o))381api.values = (o) => api.toArray(o)382api.valuesIn = (o) => api.keysIn(o).map((k) => o[k])383/* Seq ***************************************/384api.tap = (v, f) => { if (api.isFunction(f)) f(v) ; return v } // lodash dose not test if is func before calling, why crash?385api.thru = (v, f) => api.isFunction(f) ? f(v) : undefined // lodash dose not test if is func before calling, why crash?386/* String ************************************/387api.endsWith = (s, t) => api.toString(s).endsWith(t);388api.lowerFirst = (s) => api.toArray(api.toString(s)).map((c,i)=> (i === 0) ? api.toLower(c): c ).join('')389api.padStart = (s, n, c = ' ') => api.toString(s).padStart(n ,c);390api.padEnd = (s, n, c = ' ') => api.toString(s).padEnd(n,c);391api.repeat = (s, n) => api.toString(s).repeat( (n < 0 || n === Infinity || api.isNaN(n)) ? 0 : n);392api.replace = (s, f, t) => api.isNil(s) ? '' : (!t && t !== '') ? s : api.toString(s).replace(f,t)393api.split = (s, splitter) => {394 if (api.isNil(s) || isNullPrototype(s)) return [];395 if (api.isString(splitter)) return api.toString(s).split(splitter);396 if (api.isArray(splitter)) {397 let res = [api.toString(s)]398 splitter.forEach((separator,i,arr) => {399 res = res.map((str)=> api.isString(str) && api.isString(separator) ? str.split(separator): str )400 res = api.flatten(res)401 })402 return res;403 }404 return [s];405}406api.startsWith = (s, t) => api.toString(s).startsWith(t);407api.toLower = (s) => api.toString(s).toLowerCase();408api.toUpper = (s) => api.toString(s).toUpperCase();...
AnyArbitraryBuilder.spec.ts
Source:AnyArbitraryBuilder.spec.ts
...123 if (!extra.withMap) {124 expect(isMap(v)).toBe(false);125 }126 if (!extra.withNullPrototype) {127 expect(isNullPrototype(v)).toBe(false);128 }129 if (!extra.withSet) {130 expect(isSet(v)).toBe(false);131 }132 if (!extra.withSparseArray) {133 expect(isSparseArray(v)).toBe(false);134 }135 if (!extra.withTypedArray) {136 expect(isTypedArray(v)).toBe(false);137 }138 // No check for !extra.withObjectString as nothing prevent normal string builders to build such strings139 // In the coming major releases withObjectString might even disappear140 };141 const anyArbitraryBuilderBuilder = (extra: Extra) => anyArbitraryBuilder(toQualifiedObjectConstraints(extra));142 it('should produce the same values given the same seed', () => {143 assertProduceSameValueGivenSameSeed(anyArbitraryBuilderBuilder, { extraParameters });144 });145 it('should only produce correct values', () => {146 assertProduceCorrectValues(anyArbitraryBuilderBuilder, isCorrect, { extraParameters });147 });148 it('should produce values seen as shrinkable without any context', () => {149 assertProduceValuesShrinkableWithoutContext(anyArbitraryBuilderBuilder, {150 // For the moment, we are not able to reverse "object-string" values.151 // In the future our fc.string() should be able to shrink them given it does not receive any constraint on the length152 // but for the moment it somehow assume that it cannot shrink strings having strictly more than 10 characters (value of maxLength when not specified).153 extraParameters: extraParameters.map((extra) => ({ ...extra, withObjectString: false })),154 });155 });156});157// Helpers158function isBigInt(v: unknown): boolean {159 return typeof v === 'bigint';160}161function isSet(v: unknown): boolean {162 return v instanceof Set;163}164function isMap(v: unknown): boolean {165 return v instanceof Map;166}167function isDate(v: unknown): boolean {168 return v instanceof Date;169}170function isTypedArray(v: unknown): boolean {171 return (172 v instanceof Int8Array ||173 v instanceof Uint8Array ||174 v instanceof Uint8ClampedArray ||175 v instanceof Int16Array ||176 v instanceof Uint16Array ||177 v instanceof Int32Array ||178 v instanceof Uint32Array ||179 v instanceof Float32Array ||180 v instanceof Float64Array181 );182}183function isSparseArray(v: unknown): boolean {184 return Array.isArray(v) && v.length !== Object.keys(v).length;185}186function isStringified(v: unknown): boolean {187 if (typeof v !== 'string') {188 return false; // non strings are not valid string representations for objects189 }190 try {191 eval(v);192 return true; // the string was correctly parsed193 } catch (err) {194 return false; // not a valid representation195 }196}197function isStringifiedAsKeys(v: unknown): boolean {198 if (v === null || typeof v !== 'object') {199 return false; // not an object200 }201 for (const key of Object.keys(v!)) {202 try {203 eval(key);204 return true; // the string used as key the string representation of a JavaScript instance205 } catch (err) {206 // not a valid representation207 }208 }209 return false;210}211function isBoxed(v: unknown): boolean {212 return v instanceof Boolean || v instanceof Number || v instanceof String;213}214function isNullPrototype(v: unknown): boolean {215 return v !== null && typeof v === 'object' && Object.getPrototypeOf(v) === null;...
Using AI Code Generation
1const fc = require('fast-check');2const isNullPrototype = require('fast-check/lib/check/arbitrary/definition/IsNullPrototype.js');3const isNullPrototype = require('fast-check/lib/check/arbitrary/definition/IsNullPrototype.js');4console.log(isNullPrototype(null));5console.log(isNullPrototype({}));6console.log(isNullPrototype(Object.create(null)));7console.log(isNullPrototype(Object.create({})));8console.log(isNullPrototype(Object.create({a:1})));9console.log(isNullPrototype(Object.create({a:1, b:2})));10console.log(isNullPrototype(Object.create(Object.create(null))));11console.log(isNullPrototype(Object.create(Object.create({}))));12console.log(isNullPrototype(Object.create(Object.create({a:1}))));13console.log(isNullPrototype(Object.create(Object.create({a:1, b:2}))));
Using AI Code Generation
1const isNullPrototype = require('fast-check-monorepo');2console.log(isNullPrototype(null));3console.log(isNullPrototype({}));4const isNullPrototype = require('fast-check');5console.log(isNullPrototype(null));6console.log(isNullPrototype({}));7const isNullPrototype = require('fast-check');8console.log(isNullPrototype(null));9console.log(isNullPrototype({}));10const isNullPrototype = require('fast-check');11console.log(isNullPrototype(null));12console.log(isNullPrototype({}));13const isNullPrototype = require('fast-check');14console.log(isNullPrototype(null));15console.log(isNullPrototype({}));16const isNullPrototype = require('fast-check');17console.log(isNullPrototype(null));18console.log(isNullPrototype({}));19const isNullPrototype = require('fast-check');20console.log(isNullPrototype(null));21console.log(isNullPrototype({}));22const isNullPrototype = require('fast-check');23console.log(isNullPrototype(null));24console.log(isNullPrototype({}));25const isNullPrototype = require('fast-check');26console.log(isNullPrototype(null));27console.log(isNullPrototype({}));
Using AI Code Generation
1import { isNullPrototype } from 'fast-check'2const result = isNullPrototype(null)3console.log(result)4import { isNullPrototype } from 'fast-check'5const result = isNullPrototype(null)6console.log(result)7import { isNullPrototype } from 'fast-check'8const result = isNullPrototype(null)9console.log(result)10import { isNullPrototype } from 'fast-check'11const result = isNullPrototype(null)12console.log(result)13import { isNullPrototype } from 'fast-check'14const result = isNullPrototype(null)15console.log(result)16import { isNullPrototype } from 'fast-check'17const result = isNullPrototype(null)18console.log(result)19import { isNullPrototype } from 'fast-check'20const result = isNullPrototype(null)21console.log(result)22import { isNullPrototype } from 'fast-check'23const result = isNullPrototype(null)24console.log(result)25import { isNullPrototype } from 'fast-check'26const result = isNullPrototype(null)27console.log(result)28import { isNullPrototype } from 'fast-check'29const result = isNullPrototype(null)30console.log(result)31import { isNullPrototype } from 'fast-check'32const result = isNullPrototype(null)33console.log(result)
Using AI Code Generation
1import { isNullPrototype } from 'fast-check';2const obj = Object.create(null);3import { isNullPrototype } from 'fast-check';4const obj = Object.create(null);5import { assert } from 'chai';6import { asyncProperty } from 'fast-check';7import { myFunction } from './myFunction';8describe('myFunction', () => {9 it('should return a non-null value', async () => {10 await assert.isNotNull(await myFunction());11 });12});13await assert.isFulfilled(myFunction());
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