TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used...

How I can solve this error:

TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'App'. No index signature with a parameter of type 'string' was found on type 'App'

without // @ts-ignore as the index will be a method of the component itself? So I have no idea which "as keyof typeof" I should use.

this[methodCall *as keyof typeof ???* ](obj)


For better understanding, please refer to the snippet:

@Component({
...
export class App {
...
keyup(obj: IVariableBuilder): void {

const methodCall = 'keyup_' + 'X' // obj.variableName: here the prop is needed for delegation matter

// @ts-ignore
this[methodCall](obj); // related sub-function to the object input will be invoked
}

keyup_X(obj: IVariableBuilder): void {
....
}


For complete code, please refer tot stackblitz: https://stackblitz.com/edit/stackbl...c/main.ts&template=node&title=Angular Starter

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