Function getLowerBoundOfKeyType

test/fixtures/snapshot/typescript.js:58493–58515

(type)

        // bound includes those keys that are known to always be present, for example because
        // because of constraints on type parameters (e.g. 'keyof T' for a constrained T).
        function getLowerBoundOfKeyType(type) {
            if (type.flags & 4194304 /* TypeFlags.Index */) {
                var t = getApparentType(type.type);
                return isGenericTupleType(t) ? getKnownKeysOfTupleType(t) : getIndexType(t);
            }
            if (type.flags & 16777216 /* TypeFlags.Conditional */) {
                if (type.root.isDistributive) {
                    var checkType = type.checkType;
                    var constraint = getLowerBoundOfKeyType(checkType);
                    if (constraint !== checkType) {
                        return getConditionalTypeInstantiation(type, prependTypeMapping(type.root.checkType, constraint, type.mapper));
                    }
                }
                return type;
            }
            if (type.flags & 1048576 /* TypeFlags.Union */) {
                return mapType(type, getLowerBoundOfKeyType);
            }
            if (type.flags & 2097152 /* TypeFlags.Intersection */) {
                return getIntersectionType(ts.sameMap(type.types, getLowerBoundOfKeyType));
            }
            return type;
        }
        function getIsLateCheckFlag(s) {
            return ts.getCheckFlags(s) & 4096 /* CheckFlags.Late */;
        }