4chan-XZ/src/platform/helpers.ts

// This file was created because these functions on $ were sometimes not initialized yet because of circular
// dependencies, so try to keep this file without dependencies, so these functions don't have to wait for something else

export const debounce = (wait: number, fn: Function) => {
  let lastCall = 0
  let timeout = null
  let that = null
  let args = null
  const exec = function () {
    lastCall = Date.now()
    return fn.apply(that, args)
  }
  return function () {
    args = arguments
    that = this
    if (lastCall < Date.now() - wait) {
      return exec()
    }
    // stop current reset
    clearTimeout(timeout)
    // after wait, let next invocation execute immediately
    return (timeout = setTimeout(exec, wait))
  }
}

export const dict = () => Object.create(null)

dict.clone = function (obj: object) {
  if (typeof obj !== 'object' || obj === null) {
    return obj
  } else if (obj instanceof Array) {
    const arr = []
    for (let i = 0, end = obj.length; i < end; i++) {
      arr.push(dict.clone(obj[i]))
    }
    return arr
  } else {
    const map = Object.create(null)
    for (var key in obj) {
      var val = obj[key]
      map[key] = dict.clone(val)
    }
    return map
  }
}

dict.json = (str: string) => dict.clone(JSON.parse(str))

export const SECOND = 1000
export const MINUTE = SECOND * 60
export const HOUR = MINUTE * 60
export const DAY = HOUR * 24

export const platform = window.GM_xmlhttpRequest ? 'userscript' : 'crx'