since mysql, is not declared in the default Application interface in egg, it will cause an error to call directly according to the following method
this.app.mysql.get()to solve this problem, I used the following method
const app: any = this.app
app.mysql.get()but if I write in this way, I think it will lose the meaning of writing typescript.
you can write a type file yourself
import { Application } from "egg";
declare module "egg" {
interface Application {
mysql: any;
}
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