# How to use strictArbs method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

arbitrary.js

Source:arbitrary.js

`1/* @flow weak */2"use strict";3var arbitraryAssert = require("./arbitraryAssert.js");4var arbitraryBless = require("./arbitraryBless.js");5var array = require("./array.js");6var assert = require("assert");7var dict = require("./dict.js");8var generator = require("./generator.js");9var json = require("./json.js");10var pair = require("./pair.js");11var show = require("./show.js");12var shrink = require("./shrink.js");13var utils = require("./utils.js");14/**15 ### Arbitrary combinators16*/17/**18 - `nonshrink(arb: arbitrary a): arbitrary a`19 Non shrinkable version of arbitrary `arb`.20*/21function nonshrink(arb) {22 arb = utils.force(arb);23 return arbitraryBless({24 generator: arb.generator,25 shrink: shrink.noop,26 show: arb.show,27 });28}29/**30 - `unit: arbitrary ()`31*/32var unit = arbitraryBless({33 generator: generator.unit,34 shrink: shrink.noop,35 show: show.def,36});37/**38 - `either(arbA: arbitrary a, arbB : arbitrary b): arbitrary (either a b)`39*/40function either(a, b) {41 a = utils.force(a || json.json);42 b = utils.force(b || json.json);43 arbitraryAssert(a);44 arbitraryAssert(b);45 return arbitraryBless({46 generator: generator.either(a.generator, b.generator),47 shrink: shrink.either(a.shrink, b.shrink),48 show: show.either(a.show, b.show),49 });50}51/**52 - `pair(arbA: arbitrary a, arbB : arbitrary b): arbitrary (pair a b)`53 If not specified `a` and `b` are equal to `value()`.54*/55function pairArb(a, b) {56 return pair.pair(a || json.json, b || json.json);57}58/**59 - `tuple(arbs: (arbitrary a, arbitrary b...)): arbitrary (a, b...)`60*/61function tuple(arbs) {62 arbs = arbs.map(utils.force);63 return arbitraryBless({64 generator: generator.tuple(utils.pluck(arbs, "generator")),65 shrink: shrink.tuple(utils.pluck(arbs, "shrink")),66 show: show.tuple(utils.pluck(arbs, "show")),67 });68}69/**70 - `sum(arbs: (arbitrary a, arbitrary b...)): arbitrary (a | b ...)`71*/72function sum(arbs) {73 arbs = arbs.map(utils.force);74 return arbitraryBless({75 generator: generator.sum(utils.pluck(arbs, "generator")),76 shrink: shrink.sum(utils.pluck(arbs, "shrink")),77 show: show.sum(utils.pluck(arbs, "show")),78 });79}80/**81 - `dict(arb: arbitrary a): arbitrary (dict a)`82 Generates a JavaScript object with properties of type `A`.83*/84function dictArb(arb) {85 return dict.arbitrary(arb || json.json);86}87/**88 - `array(arb: arbitrary a): arbitrary (array a)`89*/90function arrayArb(arb) {91 return array.array(arb || json.json);92}93/**94 - `nearray(arb: arbitrary a): arbitrary (array a)`95*/96function nearrayArb(arb) {97 return array.nearray(arb || json.json);98}99/**100 - `json: arbitrary json`101 JavaScript Objects: boolean, number, string, null, array of `json` values or object with `json` values.102*/103var jsonArb = json.json;104/**105 - `oneof(gs : array (arbitrary a)...) : arbitrary a`106 Randomly uses one of the given arbitraries.107*/108function oneof() {109 assert(arguments.length !== 0, "oneof: at least one parameter expected");110 // TODO: write this in more functional way111 var generators = [];112 var append = function (a) {113 generators.push(utils.force(a).generator);114 };115 for (var i = 0; i < arguments.length; i++) {116 var arg = arguments[i];117 if (utils.isArray(arg)) {118 arg.forEach(append);119 } else {120 append(arg);121 }122 }123 return arbitraryBless({124 generator: generator.oneof(generators),125 // TODO: make shrink126 shrink: shrink.noop,127 show: show.def,128 });129}130// Return a lazy arbitrary that delegates to another arbitrary at its131// 'strict' property. An arbitrary must be assigned to that property before132// this arbitrary can generate anything.133function lazyArbitrary() {134 var arb = {};135 // This function must be pure because it will not be called with136 // meaningful context.137 arb.generator = generator.bless(function (size) {138 return arb.strict.generator(size);139 });140 arb.shrink = shrink.noop;141 arb.show = show.def;142 arb = arbitraryBless(arb);143 return arb;144}145/**146 - ```js147 letrec(148 (tie: key -> (arbitrary a | arbitrary b | ...))149 -> { key: arbitrary a, key: arbitrary b, ... }):150 { key: arbitrary a, key: arbitrary b, ... }151 ```152 Mutually recursive definitions. Every reference to a sibling arbitrary153 should go through the `tie` function.154 ```js155 { arb1, arb2 } = jsc.letrec(function (tie) {156 return {157 arb1: jsc.tuple(jsc.int, jsc.oneof(jsc.const(null), tie("arb2"))),158 arb2: jsc.tuple(jsc.bool, jsc.oneof(jsc.const(null), tie("arb1"))),159 }160 });161 ```162*/163function letrec(definition) {164 // We must use a lazy dictionary because we do not know the key set165 // before calling the definition.166 var lazyArbs = {};167 function tie(name) {168 if (!lazyArbs.hasOwnProperty(name)) {169 lazyArbs[name] = lazyArbitrary();170 }171 return lazyArbs[name];172 }173 var strictArbs = definition(tie);174 Object.keys(lazyArbs).forEach(function (key) {175 var strictArb = strictArbs[key];176 if (!strictArb) {177 throw new Error("undefined lazy arbitrary: " + key);178 }179 lazyArbs[key].strict = strictArb;180 });181 return strictArbs;182}183function recursive(arbZ, arbS) {184 var genZ = arbZ.generator;185 var genS = function (recGen) {186 var recArb = arbitraryBless({187 generator: recGen,188 shrink: shrink.noop,189 show: show.def,190 });191 return arbS(recArb).generator;192 };193 var gen = generator.recursive(genZ, genS);194 return arbitraryBless({195 generator: gen,196 shrink: shrink.noop,197 show: show.def,198 });199}200module.exports = {201 nonshrink: nonshrink,202 pair: pairArb,203 either: either,204 unit: unit,205 dict: dictArb,206 json: jsonArb,207 nearray: nearrayArb,208 array: arrayArb,209 tuple: tuple,210 sum: sum,211 oneof: oneof,212 recursive: recursive,213 letrec: letrec,...`

letrec.ts

Source:letrec.ts

`1import { LazyArbitrary } from './_internals/LazyArbitrary';2import { Arbitrary } from '../check/arbitrary/definition/Arbitrary';3import { safeHasOwnProperty } from '../utils/globals';4const safeObjectCreate = Object.create;5/**6 * Type of the value produced by {@link letrec}7 * @remarks Since 3.0.08 * @public9 */10export type LetrecValue<T> = {11 [K in keyof T]: Arbitrary<T[K]>;12};13/**14 * Strongly typed type for the `tie` function passed by {@link letrec} to the `builder` function we pass to it.15 * You may want also want to use its loosely typed version {@link LetrecLooselyTypedTie}.16 *17 * @remarks Since 3.0.018 * @public19 */20export interface LetrecTypedTie<T> {21 <K extends keyof T>(key: K): Arbitrary<T[K]>;22 (key: string): Arbitrary<unknown>;23}24/**25 * Strongly typed type for the `builder` function passed to {@link letrec}.26 * You may want also want to use its loosely typed version {@link LetrecLooselyTypedBuilder}.27 *28 * @remarks Since 3.0.029 * @public30 */31export type LetrecTypedBuilder<T> = (tie: LetrecTypedTie<T>) => LetrecValue<T>;32/**33 * Loosely typed type for the `tie` function passed by {@link letrec} to the `builder` function we pass to it.34 * You may want also want to use its strongly typed version {@link LetrecTypedTie}.35 *36 * @remarks Since 3.0.037 * @public38 */39export type LetrecLooselyTypedTie = (key: string) => Arbitrary<unknown>;40/**41 * Loosely typed type for the `builder` function passed to {@link letrec}.42 * You may want also want to use its strongly typed version {@link LetrecTypedBuilder}.43 *44 * @remarks Since 3.0.045 * @public46 */47export type LetrecLooselyTypedBuilder<T> = (tie: LetrecLooselyTypedTie) => LetrecValue<T>;48/**49 * For mutually recursive types50 *51 * @example52 * ```typescript53 * type Leaf = number;54 * type Node = [Tree, Tree];55 * type Tree = Node | Leaf;56 * const { tree } = fc.letrec<{ tree: Tree, node: Node, leaf: Leaf }>(tie => ({57 * tree: fc.oneof({depthSize: 'small'}, tie('leaf'), tie('node')),58 * node: fc.tuple(tie('tree'), tie('tree')),59 * leaf: fc.nat()60 * }));61 * // tree is 50% of node, 50% of leaf62 * // the ratio goes in favor of leaves as we go deeper in the tree (thanks to depthSize)63 * ```64 *65 * @param builder - Arbitraries builder based on themselves (through `tie`)66 *67 * @remarks Since 1.16.068 * @public69 */70export function letrec<T>(builder: T extends Record<string, unknown> ? LetrecTypedBuilder<T> : never): LetrecValue<T>;71/**72 * For mutually recursive types73 *74 * @example75 * ```typescript76 * const { tree } = fc.letrec(tie => ({77 * tree: fc.oneof({depthSize: 'small'}, tie('leaf'), tie('node')),78 * node: fc.tuple(tie('tree'), tie('tree')),79 * leaf: fc.nat()80 * }));81 * // tree is 50% of node, 50% of leaf82 * // the ratio goes in favor of leaves as we go deeper in the tree (thanks to depthSize)83 * ```84 *85 * @param builder - Arbitraries builder based on themselves (through `tie`)86 *87 * @remarks Since 1.16.088 * @public89 */90export function letrec<T>(builder: LetrecLooselyTypedBuilder<T>): LetrecValue<T>;91// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types92export function letrec<T>(builder: LetrecLooselyTypedBuilder<T> | LetrecTypedBuilder<T>): LetrecValue<T> {93 const lazyArbs: { [K in keyof T]?: LazyArbitrary<unknown> } = safeObjectCreate(null);94 const tie = (key: keyof T): Arbitrary<any> => {95 if (!safeHasOwnProperty(lazyArbs, key)) {96 // Call to hasOwnProperty ensures that the property key will be defined97 lazyArbs[key] = new LazyArbitrary(String(key));98 }99 // eslint-disable-next-line @typescript-eslint/no-non-null-assertion100 return lazyArbs[key]!;101 };102 const strictArbs = builder(tie as any);103 for (const key in strictArbs) {104 if (!safeHasOwnProperty(strictArbs, key)) {105 // Prevents accidental iteration over properties inherited from an objectâs prototype106 continue;107 }108 const lazyAtKey: LazyArbitrary<unknown> | undefined = lazyArbs[key];109 const lazyArb = lazyAtKey !== undefined ? lazyAtKey : new LazyArbitrary(key);110 lazyArb.underlying = strictArbs[key];111 lazyArbs[key] = lazyArb;112 }113 return strictArbs;...`

Using AI Code Generation

`1const { strictArbs } = require('fast-check');2const { strictArbs } = require('fast-check');3const { strictArbs } = require('fast-check');4const { strictArbs } = require('fast-check');5const { strictArbs } = require('fast-check');6const { strictArbs } = require('fast-check');7const { strictArbs } = require('fast-check');8const { strictArbs } = require('fast-check');9const { strictArbs } = require('fast-check');10const { strictArbs } = require('fast-check');11const { strictArbs } = require('fast-check');12const { strictArbs } = require('fast-check');13const { strictArbs } = require('fast-check');14const { strictArbs } = require('fast-check');15const { strictArbs } = require('fast-check');`

Using AI Code Generation

`1const { strictArbs } = require("fast-check");2const { string } = strictArbs;3const fc = require("fast-check");4const { string } = fc;5const { string } = require("fast-check-monorepo");6const { string } = require("fast-check-monorepo");7const fc = require("fast-check");8const { string } = fc;9const { string } = require("fast-check-monorepo");10const fc = require("fast-check");11const { string } = fc;12const { string } = require("fast-check-monorepo");13const fc = require("fast-check");14const { string } = fc;15const { string } = require("fast-check-monorepo");16const fc = require("fast-check");17const { string } = fc;18const { string } = require("fast-check-monorepo");19const fc = require("fast-check");20const { string } = fc;21const { string } = require("fast-check-monorepo");22const fc = require("fast-check");23const { string } = fc;24const { string } = require("fast-check-monorepo");25const fc = require("fast-check");26const { string } = fc;27const { string } = require("fast-check-monorepo");28const fc = require("fast-check");29const { string } = fc;30const { string } = require("fast-check-monorepo");31const fc = require("fast-check");32const { string } = fc;33const { string } = require("fast-check-monorepo");`

Using AI Code Generation

`1const { strictArbs } = require('fast-check')2const { oneof } = strictArbs3const arb = oneof(4 strictArbs.string(),5 strictArbs.number(),6 strictArbs.boolean(),7 strictArbs.constantFrom('a', 'b', 'c'),8 strictArbs.constantFrom(1, 2, 3),9 strictArbs.constantFrom(true, false),10 strictArbs.constantFrom('a', 1, true),11 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true),12 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true, 'd', 4, false),13 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true, 'd', 4, false, 'e', 5, true),14 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true, 'd', 4, false, 'e', 5, true, 'f', 6, false),15 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true, 'd', 4, false, 'e', 5, true, 'f', 6, false, 'g', 7, true),16 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true, 'd', 4, false, 'e', 5, true, 'f', 6, false, 'g', 7, true, 'h', 8, false),17 strictArbs.constantFrom('a', 1, true, 'b', 2, false, 'c', 3, true, 'd', 4, false, 'e', 5, true, 'f', 6, false, 'g', 7, true, 'h', 8, false, 'i', 9, true),18 strictArbs.constantFrom('a', 1, true, 'b', 2,`

Using AI Code Generation

`1const { strictArbs } = require("fast-check-monorepo");2const { string, number, record, array } = strictArbs;3const arb = record({ foo: string(), bar: number(), baz: array(string()) });4const sample = arb.sample();5console.log(sample);6const { strictArbs } = require("fast-check");7const { string, number, record, array } = strictArbs;8const arb = record({ foo: string(), bar: number(), baz: array(string()) });9const sample = arb.sample();10console.log(sample);`

Using AI Code Generation

`1const fc = require('fast-check');2const { strictArbs } = require('fast-check-monorepo');3const arb = strictArbs(10, 1, 100);4fc.assert(fc.property(arb, (arr) => {5 return arr.length === 10;6}));`

Using AI Code Generation

`1const { strictArbs } = require('fast-check-monorepo')2const arbs = strictArbs()3const arb = arbs.object({ a: arbs.number(), b: arbs.string() })4const { a, b } = arb.generate()5console.log({ a, b })6console.log({ a, b })7console.log({ a, b })8console.log({ a, b })`

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