@brimdata/zealot/src/util/utils.ts

The Javascript Client for Zed Lakes

import {Ts} from "../types"

function hasOwnProperty<X extends {}, Y extends PropertyKey>(
  obj: X,
  prop: Y
): obj is X & Record<Y, unknown> {
  return Object.prototype.hasOwnProperty.call(obj, prop)
}

export function isObject(thing: unknown): thing is Object {
  return typeof thing === "object" && thing !== null
}

export function isString(thing: unknown): thing is string {
  return typeof thing === "string"
}

export function isDate(thing: unknown): thing is Date {
  return isObject(thing) && thing.constructor.name === "Date"
}

export function isNumber(thing: unknown) {
  return typeof thing === "number"
}

export function isBigInt(thing: unknown): thing is bigint {
  return typeof thing === "bigint"
}

export function isFracSec(thing: unknown): thing is string {
  return isString(thing) && /^\d+\.\d+$/.test(thing)
}

export function isTs(thing: unknown): thing is Ts {
  return (
    isObject(thing) &&
    hasOwnProperty(thing, "sec") &&
    isNumber(thing.sec) &&
    hasOwnProperty(thing, "ns") &&
    isNumber(thing.ns)
  )
}