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packages/sync-core/src/test/RandomSource.ts
46 строк
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Mime Čuvalo
chore(tooling): migrate lint and formatting to oxlint and oxfmt (#8258)
19 мар 2026, 17:55
Не верифицирован
19 мар 2026, 17:55
370d3a8
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export class RandomSource { constructor(private _seed: number) {} randomInt(): number randomInt(lessThan: number): number randomInt(fromInclusive: number, toExclusive: number): number randomInt(lo?: number, hi?: number) { if (lo === undefined) { lo = Number.MAX_SAFE_INTEGER } if (hi === undefined) { hi = lo lo = 0 } this._seed = (this._seed * 9301 + 49297) % 233280 // float is a number between 0 and 1 const float = this._seed / 233280 return lo + Math.floor(float * (hi - lo)) } randomAction<Result>( // eslint-disable-next-line tldraw/method-signature-style choices: Array<(() => Result) | { weight: number; do: () => any }>, randomWeights?: boolean ): Result { type Choice = (typeof choices)[number] const getWeightFromChoice = (choice: Choice) => 'weight' in choice ? choice.weight : randomWeights ? this.randomInt(0, 10) : 1 const weights = choices.map(getWeightFromChoice) const totalWeight = weights.reduce((total, w) => total + w, 0) const randomWeight = this.randomInt(totalWeight) let weight = 0 for (let i = 0; i < choices.length; i++) { weight += weights[i] const choice = choices[i] if (randomWeight < weight) { return 'do' in choice ? choice.do() : choice() } } throw new Error('unreachable') } randomElement<Elem>(items: Elem[]): Elem | undefined { return items[this.randomInt(items.length)] } }