Add test and support for deprecated args

Author: smitt04

src/type/definition.js

@@ -825,6 +825,8 @@ function defineFieldMap<TSource, TContext>(
       type: argConfig.type,
       defaultValue: argConfig.defaultValue,
       extensions: argConfig.extensions && toObjMap(argConfig.extensions),
+      isDeprecated: Boolean(argConfig.deprecationReason),
+      deprecationReason: argConfig.deprecationReason,
       astNode: argConfig.astNode,
     }));
 

src/utilities/__tests__/buildASTSchema-test.js

@@ -736,6 +736,8 @@ describe('Schema Builder', () => {
         field1: String @deprecated
         field2: Int @deprecated(reason: "Because I said so")
         enum: MyEnum
+        field3(oldArg: String @deprecated, arg: String): String
+        field4(oldArg: String @deprecated(reason: "why not?"), arg: String): String
       }
     `;
     expect(cycleSDL(sdl)).to.equal(sdl);
@@ -790,6 +792,18 @@ describe('Schema Builder', () => {
     `);
 
     expect(printAllASTNodes(someScalar)).to.equal(scalarSDL);
+    const rootFields=assertObjectType(schema.getType('Query')).getFields();
+
+    expect(rootFields.field2.isDeprecated).to.equal(true);
+    expect(rootFields.field2.deprecationReason).to.equal('Because I said so');
+
+    const field3OldArg = rootFields.field3.args[0];
+    expect(field3OldArg.isDeprecated).to.equal(true);
+    expect(field3OldArg.deprecationReason).to.equal('No longer supported');
+
+    const field4OldArg = rootFields.field4.args[0];
+    expect(field4OldArg.isDeprecated).to.equal(true);
+    expect(field4OldArg.deprecationReason).to.equal('why not?');
   });
 
   it('Correctly extend object type', () => {

src/utilities/extendSchema.js

@@ -527,6 +527,7 @@ export function extendSchemaImpl(
           type,
           description: getDescription(field, options),
           defaultValue: valueFromAST(field.defaultValue, type),
+          deprecationReason: getDeprecationReason(field),
           astNode: field,
         };
       }

src/utilities/printSchema.js

@@ -294,7 +294,7 @@ function printInputValue(arg) {
   if (defaultAST) {
     argDecl += ` = ${print(defaultAST)}`;
   }
-  return argDecl;
+  return argDecl + printDeprecated(arg);
 }
 
 function printDirective(directive, options) {