如何构建Meteor应用程序并将其加载到Meteor Shell中

Question

I'm having a number of issues putting together a very simple piece of code as I learn Meteor. See the comments, which are questions.

server/main.js

import { Meteor } from 'meteor/meteor';

import { Post } from './schema'
// Why is this required to make Post available in Meteor.startup?
// Isn't there auto-loading?

Meteor.startup(() => {
    console.log(Post)
    // This works, but why isn't Post available to meteor shell?
});

server/schema.js

import { Post } from './models/post'
export { Post }

server/models/post.js

import { Class } from 'meteor/jagi:astronomy';
// Why can't this be imported elsewhere, like main.js?

const Posts = new Mongo.Collection('posts');
const Post = Class.create({
  name: 'Post',
  collection: Posts,
  fields: {
    title: { type: String },
    userId: String,
    publishedAt: Date
  },
});

export { Post }

In addition to these questions, how can I load my app into meteor shell? Post is undefined there, even though it's defined in Meteor.startup . I tried using .load with an absolute path, but this breaks my app's imports, which use relative paths.

As for which errors I'm confused about:

• When I try and use import inside Meteor.startup() , I get an error that the keyword import is undefined. I'm using the ecmascript package.
• When I don't import { Class } in the same file where I use Class , I get an unknown keyword error.
• If I don't import { Post } in main.js, then Post is undefined.
• Not able to load app into Meteor shell.

Answer 1

To access exported objects in Meteor shell, use require :

> require('server/schema.js').Posts.findOne();

To access objects exported by packages, use the package name:

> require('react').PropTypes;

The reason you can't access an object that's imported by another js file is that each file has its own scope here. When Meteor builds your app, it doesn't just concatenate js files like many other build systems do, and that's really a good thing.

Basically a Javascript object gets created for every js file you write. Anything you export in a js file becomes a field in this object which you can access by using require . And import is just a nicer version of the same thing.