ueblueprint/js/entity/Integer64Entity.js

import P from "parsernostrum"
import IEntity from "./IEntity.js"

export default class Integer64Entity extends IEntity {

    static grammar = /** @type {P<Integer64Entity>} */(
        P.numberBigInteger.map(v => new this(v))
    )

    /** @type {bigint} */
    #value
    get value() {
        return this.#value
    }
    set value(value) {
        if (value >= -(1n << 63n) && value < 1n << 63n) {
            this.#value = value
        }
    }

    /** @param {bigint | Number} value */
    constructor(value = 0n) {
        super()
        this.value = BigInt(value)
    }

    valueOf() {
        return this.value
    }

    toString() {
        return this.value.toString()
    }
}