@octokit/request/dist-web/index.js

import { endpoint } from '@octokit/endpoint';
import { getUserAgent } from 'universal-user-agent';
import { isPlainObject } from 'is-plain-object';
import nodeFetch from 'node-fetch';
import { RequestError } from '@octokit/request-error';

const VERSION = "5.6.3";

function getBufferResponse(response) {
    return response.arrayBuffer();
}

function fetchWrapper(requestOptions) {
    const log = requestOptions.request && requestOptions.request.log
        ? requestOptions.request.log
        : console;
    if (isPlainObject(requestOptions.body) ||
        Array.isArray(requestOptions.body)) {
        requestOptions.body = JSON.stringify(requestOptions.body);
    }
    let headers = {};
    let status;
    let url;
    const fetch = (requestOptions.request && requestOptions.request.fetch) || nodeFetch;
    return fetch(requestOptions.url, Object.assign({
        method: requestOptions.method,
        body: requestOptions.body,
        headers: requestOptions.headers,
        redirect: requestOptions.redirect,
    }, 
    // `requestOptions.request.agent` type is incompatible
    // see https://github.com/octokit/types.ts/pull/264
    requestOptions.request))
        .then(async (response) => {
        url = response.url;
        status = response.status;
        for (const keyAndValue of response.headers) {
            headers[keyAndValue[0]] = keyAndValue[1];
        }
        if ("deprecation" in headers) {
            const matches = headers.link && headers.link.match(/<([^>]+)>; rel="deprecation"/);
            const deprecationLink = matches && matches.pop();
            log.warn(`[@octokit/request] "${requestOptions.method} ${requestOptions.url}" is deprecated. It is scheduled to be removed on ${headers.sunset}${deprecationLink ? `. See ${deprecationLink}` : ""}`);
        }
        if (status === 204 || status === 205) {
            return;
        }
        // GitHub API returns 200 for HEAD requests
        if (requestOptions.method === "HEAD") {
            if (status < 400) {
                return;
            }
            throw new RequestError(response.statusText, status, {
                response: {
                    url,
                    status,
                    headers,
                    data: undefined,
                },
                request: requestOptions,
            });
        }
        if (status === 304) {
            throw new RequestError("Not modified", status, {
                response: {
                    url,
                    status,
                    headers,
                    data: await getResponseData(response),
                },
                request: requestOptions,
            });
        }
        if (status >= 400) {
            const data = await getResponseData(response);
            const error = new RequestError(toErrorMessage(data), status, {
                response: {
                    url,
                    status,
                    headers,
                    data,
                },
                request: requestOptions,
            });
            throw error;
        }
        return getResponseData(response);
    })
        .then((data) => {
        return {
            status,
            url,
            headers,
            data,
        };
    })
        .catch((error) => {
        if (error instanceof RequestError)
            throw error;
        throw new RequestError(error.message, 500, {
            request: requestOptions,
        });
    });
}
async function getResponseData(response) {
    const contentType = response.headers.get("content-type");
    if (/application\/json/.test(contentType)) {
        return response.json();
    }
    if (!contentType || /^text\/|charset=utf-8$/.test(contentType)) {
        return response.text();
    }
    return getBufferResponse(response);
}
function toErrorMessage(data) {
    if (typeof data === "string")
        return data;
    // istanbul ignore else - just in case
    if ("message" in data) {
        if (Array.isArray(data.errors)) {
            return `${data.message}: ${data.errors.map(JSON.stringify).join(", ")}`;
        }
        return data.message;
    }
    // istanbul ignore next - just in case
    return `Unknown error: ${JSON.stringify(data)}`;
}

function withDefaults(oldEndpoint, newDefaults) {
    const endpoint = oldEndpoint.defaults(newDefaults);
    const newApi = function (route, parameters) {
        const endpointOptions = endpoint.merge(route, parameters);
        if (!endpointOptions.request || !endpointOptions.request.hook) {
            return fetchWrapper(endpoint.parse(endpointOptions));
        }
        const request = (route, parameters) => {
            return fetchWrapper(endpoint.parse(endpoint.merge(route, parameters)));
        };
        Object.assign(request, {
            endpoint,
            defaults: withDefaults.bind(null, endpoint),
        });
        return endpointOptions.request.hook(request, endpointOptions);
    };
    return Object.assign(newApi, {
        endpoint,
        defaults: withDefaults.bind(null, endpoint),
    });
}

const request = withDefaults(endpoint, {
    headers: {
        "user-agent": `octokit-request.js/${VERSION} ${getUserAgent()}`,
    },
});

export { request };
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