| // @flow strict |
| |
| import inspect from '../jsutils/inspect'; |
| import invariant from '../jsutils/invariant'; |
| |
| import { Kind } from '../language/kinds'; |
| import { |
| type NamedTypeNode, |
| type ListTypeNode, |
| type NonNullTypeNode, |
| } from '../language/ast'; |
| |
| import { type GraphQLSchema } from '../type/schema'; |
| import { |
| type GraphQLNamedType, |
| GraphQLList, |
| GraphQLNonNull, |
| } from '../type/definition'; |
| |
| /** |
| * Given a Schema and an AST node describing a type, return a GraphQLType |
| * definition which applies to that type. For example, if provided the parsed |
| * AST node for `[User]`, a GraphQLList instance will be returned, containing |
| * the type called "User" found in the schema. If a type called "User" is not |
| * found in the schema, then undefined will be returned. |
| */ |
| /* eslint-disable no-redeclare */ |
| declare function typeFromAST( |
| schema: GraphQLSchema, |
| typeNode: NamedTypeNode, |
| ): GraphQLNamedType | void; |
| declare function typeFromAST( |
| schema: GraphQLSchema, |
| typeNode: ListTypeNode, |
| ): GraphQLList<any> | void; |
| declare function typeFromAST( |
| schema: GraphQLSchema, |
| typeNode: NonNullTypeNode, |
| ): GraphQLNonNull<any> | void; |
| export function typeFromAST(schema, typeNode) { |
| /* eslint-enable no-redeclare */ |
| let innerType; |
| if (typeNode.kind === Kind.LIST_TYPE) { |
| innerType = typeFromAST(schema, typeNode.type); |
| return innerType && GraphQLList(innerType); |
| } |
| if (typeNode.kind === Kind.NON_NULL_TYPE) { |
| innerType = typeFromAST(schema, typeNode.type); |
| return innerType && GraphQLNonNull(innerType); |
| } |
| if (typeNode.kind === Kind.NAMED_TYPE) { |
| return schema.getType(typeNode.name.value); |
| } |
| |
| // Not reachable. All possible type nodes have been considered. |
| invariant(false, 'Unexpected type node: ' + inspect((typeNode: empty))); |
| } |