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feat(core): support event / middleware decorators #1141

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feat(core): support event / middleware decorators #1141

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10 changes: 9 additions & 1 deletion packages/core/src/middleware.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,14 @@ export class SessionError extends Error {
export type Next = (next?: Next.Callback) => Promise<void | Fragment>
export type Middleware = (session: Session, next: Next) => Awaitable<void | Fragment>

export const Middleware = (prepend?: boolean) => <T extends Middleware>(value: T, meta: ClassMethodDecoratorContext, ...args) => {
if (meta.kind !== 'method') return value
meta.addInitializer(function () {
(this[Context.current] as Context).middleware(value.bind(this), prepend)
})
return value
}

export namespace Next {
export const MAX_DEPTH = 64

Expand Down Expand Up @@ -80,7 +88,6 @@ export class Processor {
defineProperty(this, Context.current, ctx)

// bind built-in event listeners
this.middleware(this._process.bind(this), true)
ctx.on('message', this._handleMessage.bind(this))

ctx.on('interaction/command', (session) => {
Expand Down Expand Up @@ -219,6 +226,7 @@ export class Processor {
}
}

@Middleware(true)
private async _process(session: Session, next: Next) {
let atSelf = false, appel = false
let content = session.content.trim()
Expand Down