Function combineTypeMappers

test/fixtures/snapshot/typescript.js:63325–63327

(mapper1, mapper2)

            return makeFunctionTypeMapper(function (t) { return ts.findIndex(context.inferences, function (info) { return info.typeParameter === t; }) >= index ? unknownType : t; });
        }
        function combineTypeMappers(mapper1, mapper2) {
            return mapper1 ? makeCompositeTypeMapper(3 /* TypeMapKind.Composite */, mapper1, mapper2) : mapper2;
        }
        function mergeTypeMappers(mapper1, mapper2) {
            return mapper1 ? makeCompositeTypeMapper(4 /* TypeMapKind.Merged */, mapper1, mapper2) : mapper2;
        }