Function isDeeplyNestedType

test/fixtures/snapshot/typescript.js:67181–67203

(type, stack, depth, maxDepth)

        // has expanded into `[A<NonNullable<NonNullable<NonNullable<NonNullable<NonNullable<T>>>>>>]`. In such cases we need
        // to terminate the expansion, and we do so here.
        function isDeeplyNestedType(type, stack, depth, maxDepth) {
            if (maxDepth === void 0) { maxDepth = 3; }
            if (depth >= maxDepth) {
                var identity_2 = getRecursionIdentity(type);
                var count = 0;
                var lastTypeId = 0;
                for (var i = 0; i < depth; i++) {
                    var t = stack[i];
                    if (getRecursionIdentity(t) === identity_2) {
                        // We only count occurrences with a higher type id than the previous occurrence, since higher
                        // type ids are an indicator of newer instantiations caused by recursion.
                        if (t.id >= lastTypeId) {
                            count++;
                            if (count >= maxDepth) {
                                return true;
                            }
                        }
                        lastTypeId = t.id;
                    }
                }
            }
            return false;
        }
        // The recursion identity of a type is an object identity that is shared among multiple instantiations of the type.
        // We track recursion identities in order to identify deeply nested and possibly infinite type instantiations with
        // the same origin. For example, when type parameters are in scope in an object type such as { x: T }, all