apiFetch-post.js

/* global wp, myPlugin */
const {
  apiFetch 
} = wp;

const postMyData = () => {
  apiFetch.use( apiFetch.createNonceMiddleware( myPlugin.nonce ) );

  apiFetch(
    {
      path: 'myPlugin/v1/myEndpoint',
      method: 'POST',
      data: { myDataPoint: 'somestring' }
    }
  )
  .then( result => {
    // Do something with the result
  } )
  .error( error => {
    // Do something with the error
  } );
}