fast-check/lib/check/arbitrary/definition/Value.js

Property based testing framework for JavaScript (like QuickCheck)

import { cloneMethod, hasCloneMethod } from '../../symbols.js';
const safeObjectDefineProperty = Object.defineProperty;
export class Value {
    constructor(value_, context, customGetValue = undefined) {
        this.value_ = value_;
        this.context = context;
        this.hasToBeCloned = customGetValue !== undefined || hasCloneMethod(value_);
        this.readOnce = false;
        if (this.hasToBeCloned) {
            safeObjectDefineProperty(this, 'value', { get: customGetValue !== undefined ? customGetValue : this.getValue });
        }
        else {
            this.value = value_;
        }
    }
    getValue() {
        if (this.hasToBeCloned) {
            if (!this.readOnce) {
                this.readOnce = true;
                return this.value_;
            }
            return this.value_[cloneMethod]();
        }
        return this.value_;
    }
}