Add appendField feature, closes #5

README.md

@@ -142,18 +142,23 @@ Define a new `GraphQLEnumType`
 
 Define a new `GraphQLInterfaceType`.
 
+##### .appendField(name, field)
 ##### .field(name, type, description)
 ##### .deprecated(deprecationReason)
+##### .args(args)
 ##### .arg(name, type, defaultValue, description)
 ##### .resolve(fn)
 
 ### objectType(name, [interfaces], description)
 
 Define a new `GraphQLObjectType`.
 
+##### .appendField(name, field)
 ##### .field(name, type, description)
 ##### .deprecated(deprecationReason)
+##### .args(args)
 ##### .arg(name, type, defaultValue, description)
+##### .isTypeOf(fn)
 ##### .resolve(fn)
 
 ## schemaFrom(queryRootType, mutationRootType)
@@ -170,4 +175,4 @@ Define a new `GraphQLNonNull(type)`.
 
 # Thanks
 
-Thanks to [Florent Cailhol](https://github.com/ooflorent) for the chainable interface idea!
+Thanks to [Florent Cailhol](https://github.com/ooflorent) for the chainable interface idea!

src/baseObject.js

@@ -42,6 +42,17 @@ export default class BaseObject {
     }
   }
 
+  appendField(name, field) {
+    this.__saveField();
+
+    invariant(
+      !this.fields[name],
+      `appendField(...): '${name}' is already defined`
+    );
+
+    this.fields[name] = field;
+  }
+
   field(name, type, description, resolve) {
     if (typeof description === 'function') {
       /* eslint-disable no-param-reassign */
@@ -73,6 +84,15 @@ export default class BaseObject {
 
     return this;
   }
+
+  args(args) {
+    invariant(
+      this.__field,
+      `args(...) must appear under a field`
+    );
+
+    this.__field.args = args;
+  } 
 
   arg(name, type, defaultValue, description) {
     if (!description) {