Type Alias MiddlewareFunction

MiddlewareFunction: (
ctx: IRequestContext,
next: NextFunction,
) => void | HandlerResult | Promise<void | HandlerResult>

A middleware function: pre-process, call next(), post-process. May short-circuit by returning a response without calling next().

Type Declaration

- (
  ctx: IRequestContext,
  next: NextFunction,
  ): void | HandlerResult | Promise<void | HandlerResult>
- Parameters
  - ctx: IRequestContext
  - next: NextFunction
  Returns void | HandlerResult | Promise<void | HandlerResult>

Example

const timing: MiddlewareFunction = async (ctx, next) => {
  const runtime = ctx.services.get<IRuntimeServices>(CAPABILITIES.RUNTIME);
  await next();
  // ctx.startTime is a monotonic runtime.hrtime() reading; subtract it from
  // another monotonic reading — never from a wall-clock epoch.
  ctx.response.header('X-Duration', String(runtime.hrtime() - ctx.startTime));
};

Since

0.1.0