`PseudoBigInt` primitive type is not supported

[peter-leonov]

The built-in TS PseudoBigInt type is not supported yet. It's part of TS's LiteralType type:

    interface LiteralType extends FreshableType {
        value: string | number | PseudoBigInt;
    }

https://github.com/microsoft/TypeScript/blob/cbac1ddfc73ca3b9d8741c1b51b74663a0f24695/src/compiler/types.ts#L6424-L6426

but it's atm unclear how to handle it properly.