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Add the list of removed events to migration guide (#1761)

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* Update v3-to-v4.md

* Update README.md

* Correct the wrong description

* Update docs/v3-to-v4.md

Co-authored-by: Simon Prickett <simon@crudworks.org>

* Update docs/v3-to-v4.md

Co-authored-by: Simon Prickett <simon@crudworks.org>

Co-authored-by: Simon Prickett <simon@crudworks.org>
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AnnAngela
2022-01-13 19:51:41 +08:00
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docs/v3-to-v4.md
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@ -28,15 +28,31 @@ await client.connect();
await client.ping();
```
### No `message` event
### All the removed events
In V4, you don't need to add listener to the `message` and `message_buffer` events, you can get the message directly in `subscribe`-like commands.
The following events that existed in V3 were removed in V4:
1. `warning`
2. `subscribe`
3. `psubscribe`
4. `unsubscribe`
5. `message`
6. `message_buffer`
7. `messageBuffer`
8. `pmessage`
9. `pmessage_buffer`
10. `pmessageBuffer`
11. `monitor`
#### No `message`-like event
In V4, you don't need to add a listener to the `message`-like events (items 5 to 10 of the above list), you can get the message directly in `subscribe`-like commands.
The second argument of these commands is a callback, which will be triggered every time there is a message published to the channel.
The third argument to these commands is a boolean to set `bufferMode` (default `false`). If it's set to `true` you will receive a buffer instead of a string.
The `subscribe`-like commands return a promise. If the server returns `ok` the promise will be fulfilled, otherwise the promise will be rejected.
The `subscribe`-like commands return a promise. If the command is executed successfully the promise will be fulfilled, otherwise the promise will be rejected.
```typescript
import { createClient } from 'redis';