Ako čakať na odpoveď od iného hovoru, ak chcete vytvoriť žiadosť o post volania

Žiadne starosti - sľubuje, že nie je ľahké získať na začiatku. Tak po prvé, môžete sa len spoliehať na hodnotu, ak ste čakali, že to bolo vyriešené. To môže byť vykonané, ako ste už bolo uvedené, s .potom, alebo s async / čakajú.

.potom-riešenie:

var roleUrl = 'www.example.com/roles';

const setEnviroment = (rolesdata,env) => {
let reqBody = {
    "environment": env,
    "components": rolesdata
}
console.log("REQUEST BODY CREATED", reqBody);
return req;
}

const getRoles = (env) => {
fetch(roleUrl)
.then(response => response.json())
.then(roles => {
    let rolesList = [];
    roles.map(x => {
        const roleObj = {
            name: x.name,
            id: x.id,
        }
        rolesList.push(roleObj);
    })
    return setEnviroment(rolesList, env);
 });
 // we return the promise
};
module.exports = getRoles;

class Config{

url;
rolesList;

constructor(callback){

    var baseurl = 'www.example.com/env';

    fetch(baseurl)
        .then(response => response.json())
        .then(data => {
            this.url = data.url;
            getAuth(data.env);
    }).catch((error) => {

    });

    const getAuth= (env) => {
        const headers = { 'Content-Type': 'application/json' };
        const options = { method: 'POST', headers, body:JSON.stringify(rolesJson(env))};
        console.log("THIS BODY SHOULD NOT BE UNDEFINED", options.body);
        fetch('www.example.com/auth', options)
            .then(response => response.json());
        // we return the Promise
    };
}    
}
module.exports = Config;

// calling method

Config.getAuth(env).then((value) => {
    return getRoles(env); //this returns a Promise again
}).then(x => {
    // here you have the return type of getRoles
})

pt-čakajú-riešenie:

var roleUrl = 'www.example.com/roles';

const setEnviroment = (rolesdata,env) => {
let reqBody = {
    "environment": env,
    "components": rolesdata
}
console.log("REQUEST BODY CREATED", reqBody);
return req;
}

const getRoles = async (env) => {
    let response await fetch(roleUrl); // awaiting fetch promise
    let roles = await response.json(); // awaiting .json()-promise
    let rolesList = [];
    roles.map(x => {
        const roleObj = {
            name: x.name,
            id: x.id,
        }
        rolesList.push(roleObj);
    })
    return setEnviroment(rolesList, env);
 };
 // async always returns a promise

module.exports = getRoles;

class Config{

url;
rolesList;

constructor(callback){

    var baseurl = 'www.example.com/env';

    fetch(baseurl)
        .then(response => response.json())
        .then(data => {
            this.url = data.url;
            getAuth(data.env);
    }).catch((error) => {

    });

    const getAuth = async (env) => {
        const headers = { 'Content-Type': 'application/json' };
        const options = { method: 'POST', headers, body:JSON.stringify(rolesJson(env))};
        console.log("THIS BODY SHOULD NOT BE UNDEFINED", options.body);
        const response = await fetch('www.example.com/auth', options);
        const body = await response.json();
        return body; // we return a Promise including the body
    };
}    
}
module.exports = Config;

// calling method

const callerMethod = async () => {
    const auth = await Config.getAuth(env);
    const roles = await getRoles(env);
    //now you can work with the resolved stuff
};

Vezmite prosím na vedomie, že callerMethod vráti Sľub sebe znovu, pretože je asynchrónna.