Add test and support for deprecated args

Author: smitt04

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 +792,16 @@ describe('Schema Builder', () => {
     `);
 
     expect(printAllASTNodes(someScalar)).to.equal(scalarSDL);
+    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/buildASTSchema.js

@@ -199,6 +199,7 @@ export class ASTDefinitionBuilder {
       type,
       description: getDescription(value, this._options),
       defaultValue: valueFromAST(value.defaultValue, type),
+      deprecationReason: getDeprecationReason(value),
       astNode: value,
     };
   }

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) {