fets/cjs/Response.js

TypeScript HTTP Framework focusing on e2e type-safety, easy setup, performance & great developer experience

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Response = exports.createLazySerializedResponse = exports.isLazySerializedResponse = exports.defaultSerializer = exports.LAZY_SERIALIZED_RESPONSE = void 0;
const fetch_1 = require("@whatwg-node/fetch");
exports.LAZY_SERIALIZED_RESPONSE = Symbol('LAZY_SERIALIZED_RESPONSE');
const defaultSerializer = obj => JSON.stringify(obj);
exports.defaultSerializer = defaultSerializer;
function isLazySerializedResponse(response) {
    return response[exports.LAZY_SERIALIZED_RESPONSE];
}
exports.isLazySerializedResponse = isLazySerializedResponse;
function isHeadersLike(headers) {
    return headers?.get && headers?.forEach;
}
const JSON_CONTENT_TYPE = 'application/json; charset=utf-8';
function getHeadersFromHeadersInit(init) {
    let headers;
    if (isHeadersLike(init)) {
        headers = init;
    }
    else {
        headers = new fetch_1.Headers(init);
    }
    if (!headers.has('content-type')) {
        headers.set('content-type', JSON_CONTENT_TYPE);
    }
    return headers;
}
function createLazySerializedResponse(jsonObj, init = {}) {
    let actualResponse;
    let headers;
    function getHeaders() {
        if (headers == null) {
            headers = getHeadersFromHeadersInit(init.headers);
        }
        return headers;
    }
    return {
        jsonObj,
        get actualResponse() {
            return actualResponse;
        },
        [exports.LAZY_SERIALIZED_RESPONSE]: true,
        init,
        resolveWithSerializer(serializer) {
            const serialized = serializer(jsonObj);
            init.headers = getHeaders();
            actualResponse = new fetch_1.Response(serialized, init);
        },
        json() {
            return Promise.resolve(jsonObj);
        },
        get status() {
            return (init?.status || 200);
        },
        get headers() {
            return getHeaders();
        },
    };
}
exports.createLazySerializedResponse = createLazySerializedResponse;
// This allows us to hook into serialization of the response body
exports.Response = new Proxy(fetch_1.Response, {
    get(OriginalResponse, prop, receiver) {
        if (prop === 'json') {
            return createLazySerializedResponse;
        }
        return Reflect.get(OriginalResponse, prop, receiver);
    },
});