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docs(Guides/Plugins-Guide.md) : add reminder #4117

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merged 3 commits into from Jul 5, 2022
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docs(Guides/Plugins-Guide.md) : add reminder #4117

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Update Plugins-Guide.md
mrdcvlsc Jul 5, 2022
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Update Plugins-Guide.md
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5 changes: 5 additions & 0 deletions docs/Guides/Plugins-Guide.md
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Expand Up @@ -196,6 +196,11 @@ fastify.get('/html', (request, reply) => {
reply.html({ hello: 'world' })
})
```
Reminder that the `this` keyword is not available on *arrow functions*,
so when passing functions in *`decorateReply`* and *`decorateRequest`* as
a utility that also needs access to the `request` and `reply` instance,
a function that is defined using the `function` keyword is needed instead
of an *arrow function expression*.

In the same way you can do this for the `request` object:
```js
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