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import {curry} from './curry'
function onceFn(fn, context) {  let result
  return function () {    if (fn) {      result = fn.apply(context || this, arguments)      fn = null    }
    return result  }}
export function once(fn, context) {  if (arguments.length === 1) {    const wrap = onceFn(fn, context)
    return curry(wrap)  }
  return onceFn(fn, context)}