swc/bundler/tests/.cache/deno/76d1b5d69dc192f40bdf7f959ce24d87f7643f4a.ts
강동윤 bbaf619f63
fix(bundler): Fix bugs (#1437)
swc_bundler:
 - [x] Fix wrapped esms. (denoland/deno#9307)
 - [x] Make test secure.
2021-03-02 17:33:03 +09:00

50 lines
1.3 KiB
TypeScript

// Loaded from https://deno.land/x/oak@v6.3.1/middleware.ts
// Copyright 2018-2020 the oak authors. All rights reserved. MIT license.
// deno-lint-ignore-file
import type { State } from "./application.ts";
import type { Context } from "./context.ts";
/** Middleware are functions which are chained together to deal with requests. */
export interface Middleware<
S extends State = Record<string, any>,
T extends Context = Context<S>,
> {
(context: T, next: () => Promise<void>): Promise<void> | void;
}
/** Compose multiple middleware functions into a single middleware function. */
export function compose<
S extends State = Record<string, any>,
T extends Context = Context<S>,
>(
middleware: Middleware<S, T>[],
): (context: T, next?: () => Promise<void>) => Promise<void> {
return function composedMiddleware(
context: T,
next?: () => Promise<void>,
): Promise<void> {
let index = -1;
async function dispatch(i: number): Promise<void> {
if (i <= index) {
throw new Error("next() called multiple times.");
}
index = i;
let fn: Middleware<S, T> | undefined = middleware[i];
if (i === middleware.length) {
fn = next;
}
if (!fn) {
return;
}
await fn(context, dispatch.bind(null, i + 1));
}
return dispatch(0);
};
}