Browser support for array.includes and alternatives
Instead of using an API that is currently marked as "experimental" consider using a more broadly supported method, such as Array.prototype.indexOf() (which is also supported by IE).
Instead of t.title.includes(string) you could use t.title.indexOf(string) >= 0
You can also use Array.prototype.filter() to get a new array of strings that meet a certain criteria, as in the example below.
As the MDN article you linked to says, Firefox only supports .includes in nightly builds, other browsers didn't support it at all at the time the article was last updated (Chrome may have been updated to support it at a later time). If you want to support all browsers, you can use the polyfill outlined in the same article:
if (![].includes) { Array.prototype.includes = function(searchElement /*, fromIndex*/ ) { 'use strict'; var O = Object(this); var len = parseInt(O.length) || 0; if (len === 0) { return false; } var n = parseInt(arguments[1]) || 0; var k; if (n >= 0) { k = n; } else { k = len + n; if (k < 0) {k = 0;} } var currentElement; while (k < len) { currentElement = O[k]; if (searchElement === currentElement || (searchElement !== searchElement && currentElement !== currentElement)) { return true; } k++; } return false; };}However, it sounds like your problem has a better solution, but it's hard to tell without any specifics.