GraphQLNonNull
Non-Null Type Wrapper
A non-null is a wrapping type which points to another type. Non-null types enforce that their values are never null and can ensure an error is raised if this ever occurs during a request. It is useful for fields which you can make a strong guarantee on non-nullability, for example usually the id field of a database row will never be null.
Example:
const RowType = new GraphQLObjectType({
name: 'Row',
fields: () => ({
id: { type: new GraphQLNonNull(GraphQLString) },
})
})
Note: the enforcement of non-nullability occurs within the executor.
class GraphQLNonNull<T extends GraphQLNullableType> { }
constructor(ofType: T);
readonly ofType: T;
get [Symbol.toStringTag](): string;
toJSON(): string;
toString(): string;