运行可观察到的JavaScript

Question

我试图使用可观察到有规则的Javascript。从这里操作指导：https://www.npmjs.com/package/rxjs

这是序列 - 不知道是什么问题：

    npm install rxjs
    npm WARN [email protected] No description
    npm WARN [email protected] No repository field.

    + [email protected]
    removed 13 packages, updated 1 package and audited 2 packages in 3.163s
    found 0 vulnerabilities

    ------------------------------------------------------------
    » cat package.json                                                                                                                                                                
        {
          "name": "test",
          "version": "1.0.0",
          "description": "",
          "main": "counter.js",
          "dependencies": {
            "rxjs": "^6.4.0"
          },
          "devDependencies": {},
          "scripts": {
            "test": "echo \"Error: no test specified\" && exit 1"
          },
          "keywords": [],
          "author": "",
          "license": "ISC"
        }

    ------------------------------------------------------------
    » cat obs.js  
      import { range } from 'rxjs';
      import { map, filter } from 'rxjs/operators';

      range(1, 200).pipe(
        filter(x => x % 2 === 1),
        map(x => x + x)
      ).subscribe(x => console.log(x));
    ------------------------------------------------------------
    » node obs.js                                                                                                                                                                     
        obs.js:1
        (function (exports, require, module, __filename, __dirname) { import { range } from 'rxjs';

        SyntaxError: Unexpected token {
            at new Script (vm.js:79:7)
            at createScript (vm.js:251:10)
            at Object.runInThisContext (vm.js:303:10)
            at Module._compile (internal/modules/cjs/loader.js:656:28)
            at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
            at Module.load (internal/modules/cjs/loader.js:598:32)
            at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
            at Function.Module._load (internal/modules/cjs/loader.js:529:3)
enter code here            at Function.Module.runMain (internal/modules/cjs/loader.js:741:12)
            at startup (internal/bootstrap/node.js:285:19)
------------------------------------------------------------

Answer 1

事情是令人沮丧的错误的模块导入如何与RxJS包工作。每当它是越来越使用import * as rxjs from "rxjs"所有的出口特征的进口被连接到default的rxjs财产。然后，您必须解构他们关闭该属性，而不是rxjs本身。例如，如果您使用以下命令这应该工作：

命令（注意.mjs扩展名）：

node --experimental-modules obs.mjs

码：

import * as rxjs from 'rxjs';
const {range} = rxjs.default;
console.log(typeof range);

---

你也可以只是，不使用模块只使用require语句：

命令（注意非.mjs扩展名）：

node obs.js

码：

const { range } = require("rxjs");
const { map, filter } = require("rxjs/operators");

range(1, 200).pipe(
    filter(x => x % 2 === 1),
    map(x => x + x)
).subscribe(x => console.log(x));

---

想想也是，这个问题在GitHub上Provide named exports #3745