How to export a variable in JavaScript within a function?

Question

I have the following function:

export function request(
  searchKey,
  apiEndpoint,
  path,
  params,
  { additionalHeaders } = {}
) {
  const method = "POST";
  return _request(method, searchKey, apiEndpoint, path, params, {
    additionalHeaders
  }).then(response => {
    return response
      .json()
      .then(json => {
        var my_json = update(params)
        const result = { response: response, json: json };
        return result;
      })
  });
}

I want to export the variable my_json to another .js file. I already tried with export { my_json }, but it only works if I do that on the top of the document, which doesn't work in my case. Does anyone have an idea?

You can create global variable and then export it at the end. But what you are asking is not possible. — xMayank
– xMayank, Commented Jul 10, 2020 at 18:27
did you try store your function into a variable?: export let request = () => {} — sonEtLumiere
– sonEtLumiere, Commented Jul 10, 2020 at 18:30
I am using elasticsearch in order to build a search engine. Unfortunately elasticsearch doesn‘t provide the functionality that I need and it has some bugs when I modify it according to my needs. So basically, I want to override the output of the Connector API, which is in another file, with the json stored in my_json. I create it at that point, because there are the relevant parameters that I need in order to build my json file. — spadel
– spadel, Commented Jul 10, 2020 at 20:35

AyushKatiyar · Accepted Answer · 2020-07-10 18:37:13Z

You can't export a variable which is inside a function but you can definitely get the value stored in my_json by the help of a callback function written in another javascript file. Try using:

export function request(
  searchKey,
  apiEndpoint,
  path,
  params,
  { additionalHeaders } = {},
  callback
) {
  const method = "POST";
  return _request(method, searchKey, apiEndpoint, path, params, {
    additionalHeaders
  }).then(response => {
    return response
      .json()
      .then(json => {
        var my_json = update(params);
        callback(my_json);
        const result = { response: response, json: json };
        return result;
      })
  });
}

and in the other file define a function callback like:

function callback(data){
    // assign this data to another variable so that one can use it
    console.log(data)
}

and while calling the request function add one more argument as callback.

Hope this helps.

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