expo-auth-session/build/Fetch.js

Expo module for browser-based authentication

export async function requestAsync(requestUrl, fetchRequest) {
    const url = new URL(requestUrl);
    const headers = {};
    const request = {
        body: undefined,
        method: fetchRequest.method,
        mode: 'cors',
        headers,
    };
    const isJsonDataType = fetchRequest.dataType?.toLowerCase() === 'json';
    if (fetchRequest.headers) {
        for (const i in fetchRequest.headers) {
            if (i in fetchRequest.headers) {
                headers[i] = fetchRequest.headers[i];
            }
        }
    }
    if (fetchRequest.body) {
        if (fetchRequest.method?.toUpperCase() === 'POST') {
            request.body = new URLSearchParams(fetchRequest.body).toString();
        }
        else {
            for (const key of Object.keys(fetchRequest.body)) {
                url.searchParams.append(key, fetchRequest.body[key]);
            }
        }
    }
    if (isJsonDataType && !headers.Accept && !headers.accept) {
        // NOTE: Github authentication will return XML if this includes the standard `*/*`
        headers['Accept'] = 'application/json, text/javascript; q=0.01';
    }
    // Fix a problem with React Native `URL` causing a trailing slash to be added.
    const correctedUrl = url.toString().replace(/\/$/, '');
    const response = await fetch(correctedUrl, request);
    const contentType = response.headers.get('content-type');
    if (isJsonDataType || contentType?.includes('application/json')) {
        return response.json();
    }
    // @ts-ignore: Type 'string' is not assignable to type 'T'.
    return response.text();
}
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