Function getUnionOrIntersectionTypePredicate

test/fixtures/snapshot/typescript.js:61356–61387

(signatures, kind)

            return getUnionTypeFromSortedList(typeSet, objectFlags, aliasSymbol, aliasTypeArguments, origin);
        }
        function getUnionOrIntersectionTypePredicate(signatures, kind) {
            var first;
            var types = [];
            for (var _i = 0, signatures_6 = signatures; _i < signatures_6.length; _i++) {
                var sig = signatures_6[_i];
                var pred = getTypePredicateOfSignature(sig);
                if (!pred || pred.kind === 2 /* TypePredicateKind.AssertsThis */ || pred.kind === 3 /* TypePredicateKind.AssertsIdentifier */) {
                    if (kind !== 2097152 /* TypeFlags.Intersection */) {
                        continue;
                    }
                    else {
                        return; // intersections demand all members be type predicates for the result to have a predicate
                    }
                }
                if (first) {
                    if (!typePredicateKindsMatch(first, pred)) {
                        // No common type predicate.
                        return undefined;
                    }
                }
                else {
                    first = pred;
                }
                types.push(pred.type);
            }
            if (!first) {
                // No signatures had a type predicate.
                return undefined;
            }
            var compositeType = getUnionOrIntersectionType(types, kind);
            return createTypePredicate(first.kind, first.parameterName, first.parameterIndex, compositeType);
        }
        function typePredicateKindsMatch(a, b) {
            return a.kind === b.kind && a.parameterIndex === b.parameterIndex;
        }