Function getFieldMapper

packages/utils/src/mapSchema.ts:508–524

(
  schema: GraphQLSchema,
  schemaMapper: SchemaMapper,
  typeName: string,
)

}

function getFieldMapper<F extends GraphQLFieldConfig<any, any> | GraphQLInputFieldConfig>(
  schema: GraphQLSchema,
  schemaMapper: SchemaMapper,
  typeName: string,
): GenericFieldMapper<F> | null {
  const specifiers = getFieldSpecifiers(schema, typeName);
  let fieldMapper: GenericFieldMapper<F> | undefined;
  const stack = [...specifiers];
  while (!fieldMapper && stack.length > 0) {
    // It is safe to use the ! operator here as we check the length.
    const next = stack.pop()!;
    // TODO: fix this as unknown cast
    fieldMapper = schemaMapper[next] as unknown as GenericFieldMapper<F>;
  }

  return fieldMapper ?? null;
}

function getArgumentMapper(schemaMapper: SchemaMapper): ArgumentMapper | null {
  const argumentMapper = schemaMapper[MapperKind.ARGUMENT];