next/dist/esm/server/web/spec-extension/fetch-event.js

The React Framework

import { PageSignatureError } from '../error';
const responseSymbol = Symbol('response');
const passThroughSymbol = Symbol('passThrough');
const waitUntilSymbol = Symbol('waitUntil');
class FetchEvent {
    constructor(_request, waitUntil){
        this[passThroughSymbol] = false;
        this[waitUntilSymbol] = waitUntil ? {
            kind: 'external',
            function: waitUntil
        } : {
            kind: 'internal',
            promises: []
        };
    }
    // TODO: is this dead code? NextFetchEvent never lets this get called
    respondWith(response) {
        if (!this[responseSymbol]) {
            this[responseSymbol] = Promise.resolve(response);
        }
    }
    // TODO: is this dead code? passThroughSymbol is unused
    passThroughOnException() {
        this[passThroughSymbol] = true;
    }
    waitUntil(promise) {
        if (this[waitUntilSymbol].kind === 'external') {
            // if we received an external waitUntil, we delegate to it
            // TODO(after): this will make us not go through `getServerError(error, 'edge-server')` in `sandbox`
            const waitUntil = this[waitUntilSymbol].function;
            return waitUntil(promise);
        } else {
            // if we didn't receive an external waitUntil, we make it work on our own
            // (and expect the caller to do something with the promises)
            this[waitUntilSymbol].promises.push(promise);
        }
    }
}
export function getWaitUntilPromiseFromEvent(event) {
    return event[waitUntilSymbol].kind === 'internal' ? Promise.all(event[waitUntilSymbol].promises).then(()=>{}) : undefined;
}
export class NextFetchEvent extends FetchEvent {
    constructor(params){
        var _params_context;
        super(params.request, (_params_context = params.context) == null ? void 0 : _params_context.waitUntil);
        this.sourcePage = params.page;
    }
    /**
   * @deprecated The `request` is now the first parameter and the API is now async.
   *
   * Read more: https://nextjs.org/docs/messages/middleware-new-signature
   */ get request() {
        throw Object.defineProperty(new PageSignatureError({
            page: this.sourcePage
        }), "__NEXT_ERROR_CODE", {
            value: "E394",
            enumerable: false,
            configurable: true
        });
    }
    /**
   * @deprecated Using `respondWith` is no longer needed.
   *
   * Read more: https://nextjs.org/docs/messages/middleware-new-signature
   */ respondWith() {
        throw Object.defineProperty(new PageSignatureError({
            page: this.sourcePage
        }), "__NEXT_ERROR_CODE", {
            value: "E394",
            enumerable: false,
            configurable: true
        });
    }
}

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