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JAVASCRIPT

Promise.prototype.finally

let isLoading = true;

fetch(myRequest).then(function(response) {
    var contentType = response.headers.get("content-type");
    if(contentType && contentType.includes("application/json")) {
      return response.json();
    }
    throw new TypeError("Oops, no hemos obtenido un JSON!");
  })
  .then(function(json) { /* procesar el JSON */ })
  .catch(function(error) { console.log(error); /* esta línea podría arrojar error, e.g. cuando console = {} */ })
  .finally(function() { isLoading = false; });

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