Internet Explorer 9, JS-Error when executing search

[MenNoWar]

Installed latest fhir.js, edited the file and removed the ")" in the "export type ResourceName" name.

When running on Chrome/WebKit everything works fine.
Then we had to test it on IE9 and each time a call of the FhirClient.search is made, Internet Explorer throws a promise reject 'The object does not support the "includes" property or method.'.

Unluckily the IE Console does not allow to investigate deeper where that rejection comes from.