如何使用 Object.defineProperty 的导出指令？

Question

It's clear how to use the export statement with object or function:

export function take(source, n) {
         return source.slice(0, n);         
}

But what if i'd like to extend prototype using Object.defineProperty

Object.defineProperty(Enumerable.prototype, 'take', {
  value(n) {
    return [].concat(this).slice(0, n);
  },
});

How to use export in this case?

Answer 1

You don't really have to export anything, but in other files where you want to use the extended prototype, you have to import the file where you did it.

// enumerable.js
Object.defineProperty(Enumerable.prototype, 'take', {
  value(n) {
    return [].concat(this).slice(0, n);
  },
});

// index.js
import * as enumerable from './enumerable.js'

console.log(Enumerable.prototype.take) // will be a function here