# PICTURES
<!-- Put the link to this slide here so people can follow -->
---
# 電
---
![](https://i.imgur.com/22Vt04T.png =700x)
---
![](https://i.imgur.com/G4AKJSk.png =600x)
---
![](https://i.imgur.com/rnw5EmJ.jpg =600x)
---
![](https://i.imgur.com/T1hDKcT.png =600x)
---
![](https://i.imgur.com/Omc9XaR.png =600x)
---
![](https://i.imgur.com/z2PbJg0.png =600x)
---
# 弱電
---
![](https://i.imgur.com/FceHYIe.png =600x)
---
![](https://i.imgur.com/nPW5ojk.png =600x)
---
![](https://i.imgur.com/Y08w5q8.png =600x)
---
![](https://i.imgur.com/kf3HxOE.png =600x)
---
![](https://i.imgur.com/ne8ApMh.png =600x)
---
# 平面
---
![](https://i.imgur.com/8NKxxnm.png =900x)
---
![](https://i.imgur.com/ZVeElD9.png =900x)
---
```graphviz
digraph {
compound=true
rankdir=RL
graph [ fontname="Source Sans Pro", fontsize=20 ];
node [ fontname="Source Sans Pro", fontsize=18];
edge [ fontname="Source Sans Pro", fontsize=12 ];
subgraph core {
c [label="Hackmd-it \ncore"] [shape=box]
}
c -> sync [ltail=session lhead=session]
subgraph cluster1 {
concentrate=true
a [label="Text source\nGithub, Gitlab, ..."] [shape=box]
b [label="HackMD Editor"] [shape=box]
sync [label="sync" shape=plaintext ]
b -> sync [dir="both"]
sync -> a [dir="both"]
label="An edit session"
}
}
```
---
### Architecture of extension
---
![](https://i.imgur.com/ij69tPh.png)
---
## Content script
- Bind with each page
- Manipulate DOM
- Add event listeners
- Isolated JavaScript environment
- It doesn't break things
---
# :fork_and_knife:
---
<style>
code.blue {
color: #337AB7 !important;
}
code.orange {
color: #F7A004 !important;
}
</style>
- <code class="orange">onMessage('event')</code>: Register event listener
- <code class="blue">sendMessage('event')</code>: Trigger event
---
# :bulb:
---
- Dead simple API
- Only cares about application logic
---
```typescript
import * as Channeru from 'channeru'
// setup channel in different page environment, once
const channel = Channeru.create()
```
---
```typescript
// in background script
const fakeLogin = async () => true
channel.answer('isLogin', async () => {
return await fakeLogin()
})
```
<br>
```typescript
// in inject script
const isLogin = await channel.callBackground('isLogin')
console.log(isLogin) //-> true
```
---
# :100: :muscle: :tada:
---
### Wrap up
- Cross envornment commnication
- A small library to solve messaging pain
- TypeScript Rocks :tada:
---
### Thank you! :sheep:
You can find me on
- GitHub
- Twitter
- or email me
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