genql-upload/build/createFetcher.js

Graphql Upload support for genql

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createFetcher = void 0;
const form_data_1 = __importDefault(require("form-data"));
const isomorphic_fetch_1 = __importDefault(require("isomorphic-fetch"));
const extractFiles_1 = require("./extractFiles");
function createFetcher(opts) {
    const url = opts.url;
    return async (operation) => {
        if (Array.isArray(operation)) {
            throw new Error("Batch uploads are not supported");
        }
        const { clone, files } = (0, extractFiles_1.extractFiles)(operation);
        const formData = new form_data_1.default();
        // 1. First document is graphql query with variables
        formData.append("operations", JSON.stringify(clone));
        // 2. Second document maps files to variable locations
        const map = {};
        let i = 0;
        files.forEach((paths) => {
            map[i++] = paths;
        });
        formData.append("map", JSON.stringify(map));
        // 3. all files not (same index as in map)
        let j = 0;
        for (const [file] of files) {
            formData.append(`${j++}`, file.data, file.name);
        }
        // normal fetch
        let headersObject = typeof opts.headers == "function" ? await opts.headers() : opts.headers;
        headersObject = headersObject || {};
        const res = await (0, isomorphic_fetch_1.default)(url, {
            method: "POST",
            headers: {
                ...headersObject,
            },
            body: formData,
        });
        if (!res.ok) {
            throw new Error(`${res.statusText}: ${await res.text()}`);
        }
        const json = (await res.json());
        return json;
    };
}
exports.createFetcher = createFetcher;