Fix adone for ts 4.1 (#47639)
Fix adone for ts 4.1 (#47639)

Work around a bug by splitting DefaultMap's constructor with optional
parameters into 3 constructors without optional parameters.
georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,mcliment/DefinitelyTyped