Function combineIntersectionThisParam

test/fixtures/snapshot/typescript.js:73190–73199

(left, right, mapper)

                : undefined;
        }
        function combineIntersectionThisParam(left, right, mapper) {
            if (!left || !right) {
                return left || right;
            }
            // A signature `this` type might be a read or a write position... It's very possible that it should be invariant
            // and we should refuse to merge signatures if there are `this` types and they do not match. However, so as to be
            // pessimistic when contextual typing, for now, we'll union the `this` types.
            var thisType = getUnionType([getTypeOfSymbol(left), instantiateType(getTypeOfSymbol(right), mapper)]);
            return createSymbolWithType(left, thisType);
        }
        function combineIntersectionParameters(left, right, mapper) {
            var leftCount = getParameterCount(left);
            var rightCount = getParameterCount(right);