Chrome currently does not support passing TrustedScript to the Function constructor, and instead fails with a Trusted Types violation when called. As the Function constructor is used in a handful of places within Angular, such as in the JIT compiler and named_array_type, the workaround proposed on the following page is implemented: https://github.com/w3c/webappsec-trusted-types/wiki/Trusted-Types-for-function-constructor To be precise, it constructs a string representing an anonymous function in a way that is equivalent to what the Function constructor does, promotes it to a TrustedScript and then calls eval. To facilitate backwards compatibility, new Function is used directly in environments that do not support Trusted Types. PR Close #39209