owned this note changed 6 years ago
Linked with GitHub

HackMD-it

enhance GitHub with

open collaborative editor

Yukai Huang

@TypeScript Switzerland

slide: hackmd.io/p/ts-swiss


We have a collaborative session

please prepare laptop or smartphone to join!


Who am I?
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  • Yukai Huang
  • Full Stack Developer @HackMD
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  • VSCode
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  • I use tabs.
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What's HackMD?

Shamelss plug here

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Let's play with it!
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hackmd.io/ts-swiss-demo


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70% of our users are developers. Developers
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GitHub.


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Usage flow


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Extension architecture
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Background script

  • Run after the extension start
  • Long run action, web request, heavy works,
  • Kinda backend

Content script

  • Bind with each page
  • Manipulate DOM
  • Add event listeners
  • Isolated JavaScript environment
    • It doesn't break things

Injected script

  • Injected with content script
  • Accessing global variable
  • Call global function
  • Acts as JavaScript inserted with HTML script tag <script>

3 environments


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cross-environment communication


Case: Sync HackMD with GitHub


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  • We can't send message between two injected scripts
  • We need to manage flow by ourself
  • Different set of API
    • content <-> background
    • content <-> injected

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  • onMessage('event'): Register event listener
  • sendMessage('event'): Trigger event

Register event listener


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Trigger event


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What if we want the result back?


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It's a pain to bridge events manually


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  • Dead simple API
  • Only cares about application logic

import * as Channeru from 'channeru'

// setup channel in different page environment, once
const channel = Channeru.create()

// in background script
const fakeLogin = async () => true

channel.answer('isLogin', async () => {
  return await fakeLogin()
})

// in inject script
const isLogin = await channel.callBackground('isLogin')
console.log(isLogin) //-> true

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Our extension is not open sourced for now

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Use crx-bridge as alternative

https://github.com/NeekSandhu/crx-bridge


We
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typescript!


  • Strongly Typed: Manage different protocol with ease
  • IDE Features (I
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    VSCode)

One more thing


HackDF

HackDF keeps Documentation Fresh

(recursive acronym)

hackmd.io/hackdf


  • an GitHub App
  • Integrate GitHub With HackMD
  • Remind you when should update documentation
  • Commit and push documentation changes right on HackMD

Wrap up

  • Cross envornment commnication
  • A small library to solve messaging pain
  • TypeScript Rocks
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Wishlist


Thank you!
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You can find me on

Select a repo