wixFetch.fetch Type error on body please help

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1 
import wixFetch from 'wix-fetch';
import wixSecretsBackend from 'wix-secrets-backend';

export async function getToken()  {

const id = await wixSecretsBackend.getSecret("client_id");
const asecret = await wixSecretsBackend.getSecret("client_secret");

const body = {
    "grant_type": "client_credentials", 
    "client_id": id, 
    "client_secret": asecret
};

wixFetch.fetch("https:// someurl . com/v1/token", {
        "method": "post", 
        "headers": {
            "content-type":"application/json" 
            },
        "body": body
        }) 
   .then( (httpResponse) => {
       let bodyUsed = httpResponse.bodyUsed;
       let statusText = httpResponse.statusText;
       let headers = httpResponse.headers;
       let url = httpResponse.url;
       if (httpResponse.ok) {
           return httpResponse.json();
       }
      else {
           return Promise.reject("Fetch did not succeed");
   }
})
  .then( (json) => {
    console.log(json.someKey);
  } )
  .catch( (err) => {
    console.log(err);
  } );

}

//ERROR : Type '{ grant_type: string; client_id: string; client_secret: string; }' is not assignable to type 'string'. It’s recommended you use a new variable, such as "let newVar = ..." to make sure that all code completion work correctly.

Can someone help me. I am having a hell of a time retrieving an access token from a 3rd party API I am trying to integrate. This is my backend function. I keep getting those ugly little red squiggled lines under “body” on line 21. I have included the error message in the code above. Anyone know how to fix this problem? I am using the code from the velo/wix documentation. Not sure why I can’t use the recommended code, replace the required information with what is needed for the API I am attempting to use, and it work as intended, but here we are. Any ideas?

2

Inside the fetch function call try:

"body": JSON.stringify(body)
3

I mean in line21