curl.js

/**

    Same signature as fetch. It returns a ready to use curl command with
    {headers} optional JSON {body}, {method} and CLI {curlCliOptions}

    curl('https://en.wikipedia.org/api/rest_v1/page/summary/Cehegin',
          {
            headers: { accept: 'application/json' },
            body: {},
            method: 'GET'
          },
          '-vvv' });

*/
const noUserAgent = h => !/User/i.test(h);

type Props = {
    headers?: Headers | object;
    method?: string;
    body?: any;
};

export const curl = (url: string, { headers, body = null, method = 'GET' }: Props, curlCliOptions = '') => {
    let headerString = '';
    //@ts-ignore
    if (headers?.forEach) {
        //@ts-ignore
        headers.forEach((value, headerKey) => {
            headerString = noUserAgent(headerKey) ? headerString.concat(` -H '${headerKey}:${value}'`) : headerString;
        });
    } else {
        const headerKeys = headers ? Object.keys(headers).filter(noUserAgent) : [];
        //@ts-ignore
        headerString = headerKeys.reduce((s, headerKey) => `${s} -H ${headerKey}:${headers[headerKey]}`, '');
    }
    const bodyArgs = body ? `-d ${JSON.stringify(body)}` : '';
    const command = `curl ${curlCliOptions} ${headerString} -X ${method} ${url} ${bodyArgs}`;
    return `\n\n${command}\n\n\n`;
};