Add Typescript types definitions for function parameters (i.e. event, context and cb)

[Samaze123]

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Proposal

• What is the proposed change?

Add types definitions in a npm package. Why not @types/scaleway-functions.

• Who does this proposal help, and why?

All the devs who work with typescript. It will help the developpers maintains the functions with the latests changes as typescript will throw errors when a features becomes decprecated and it will add autocompletion in text editors like VSCode for an easier coding.

Example

In a function function.ts :

export async function handle(event: ScalewayEventFunction, context: ScalewayContextFunction, _cb: ScalewayCallbackFunction)