@bbc/http-transport-cache/lib/isCachable.js

Caching middleware

'use strict';

const { isEmpty } = require('lodash');
const directives = require('./directives');

module.exports = (cacheControl, directive, defaultTTL) => {
  return (!isEmpty(cacheControl) &&
    !cacheControl[directives.NO_STORE] &&
    !cacheControl[directives.PRIVATE] &&
    (cacheControl[directive])) ||
    !!defaultTTL;
};