DecorationMethod Type — fastify Architecture

Source Code

types/instance.d.ts lines 98–115

type DecorationMethod<This, Return = This> = {
  <
    // Need to disable "no-use-before-define" to maintain backwards compatibility, as else decorate<Foo> would suddenly mean something new

    T extends (P extends keyof This ? This[P] : unknown),
    P extends string | symbol = string | symbol
  >(property: P,
    value: GetterSetter<This, T extends (...args: any[]) => any
      ? (this: This, ...args: Parameters<T>) => ReturnType<T>
      : T
    >,
    dependencies?: string[]
  ): Return;

  (property: string | symbol): Return;

  (property: string | symbol, value: null | undefined, dependencies: string[]): Return;
}