fix: allow Array for type definition in FieldConfig

Author: nodkz

examples/forTests/schema/query/user/roles.ts

@@ -0,0 +1,4 @@
+export default {
+  type: ['String'],
+  resolve: () => ['ADMIN', 'USER'],
+};

src/__tests__/__snapshots__/requireAstToSchema-test.ts.snap

@@ -59,6 +59,7 @@ type UserAwesomeType {
   firstName: String
   lastName: String
   extendedData: UserExtendedData
+  roles: [String]
 }
 
 type UserExtendedData {

src/__tests__/__snapshots__/requireSchemaDirectory-test.ts.snap

@@ -87,6 +87,7 @@ Object {
       "children": Object {
         "extendedData": Any<Object>,
         "index": Any<Object>,
+        "roles": Any<Object>,
       },
       "kind": "dir",
       "name": "user",

src/__tests__/requireSchemaDirectory-test.ts

@@ -35,6 +35,7 @@ describe('requireSchemaDirectory()', () => {
             children: {
               extendedData: expect.any(Object),
               index: expect.any(Object),
+              roles: expect.any(Object),
             },
           },
         },

src/requireAstToSchema.ts

@@ -186,7 +186,7 @@ function prepareFieldConfig(
 
   if (!fc.type || !isSomeOutputTypeDefinition(fc.type)) {
     throw new Error(dedent`
-      Module MUST return FieldConfig with TYPE property in '${ast.absPath}'. 
+      Module MUST return FieldConfig with correct 'type: xxx' property in '${ast.absPath}'. 
       Eg:
         export default {
           type: 'String'
@@ -198,9 +198,14 @@ function prepareFieldConfig(
 }
 
 function isSomeOutputTypeDefinition(type: any): boolean {
-  return (
-    (typeof type === 'string' &&
-      (isSomeOutputTypeDefinitionString(type) || isTypeNameString(type))) ||
-    isComposeOutputType(type)
-  );
+  if (typeof type === 'string') {
+    // type: 'String'
+    return isSomeOutputTypeDefinitionString(type) || isTypeNameString(type);
+  } else if (Array.isArray(type)) {
+    // type: ['String']
+    return isSomeOutputTypeDefinition(type[0]);
+  } else {
+    // type: 'type User { name: String }'
+    return isComposeOutputType(type);
+  }
 }