tests/cases/compiler/declarationEmitDestructuringWithOptionalBindingParameters.ts(1,14): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
tests/cases/compiler/declarationEmitDestructuringWithOptionalBindingParameters.ts(3,16): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.


==== tests/cases/compiler/declarationEmitDestructuringWithOptionalBindingParameters.ts (2 errors) ====
    function foo([x,y,z]?: [string, number, boolean]) {
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
    }
    function foo1( { x, y, z }?: { x: string; y: number; z: boolean }) {
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
    }