Add @stream directive to specified directives

Author: robrichard

src/__tests__/starWarsIntrospection-test.js

@@ -37,6 +37,7 @@ describe('Star Wars Introspection Tests', () => {
             { name: 'Droid' },
             { name: 'Query' },
             { name: 'Boolean' },
+            { name: 'Int' },
             { name: '__Schema' },
             { name: '__Type' },
             { name: '__TypeKind' },

src/index.d.ts

@@ -55,6 +55,7 @@ export {
   GraphQLIncludeDirective,
   GraphQLSkipDirective,
   GraphQLDeferDirective,
+  GraphQLStreamDirective,
   GraphQLDeprecatedDirective,
   GraphQLSpecifiedByDirective,
   // "Enum" of Type Kinds

src/index.js

@@ -54,6 +54,7 @@ export {
   GraphQLIncludeDirective,
   GraphQLSkipDirective,
   GraphQLDeferDirective,
+  GraphQLStreamDirective,
   GraphQLDeprecatedDirective,
   GraphQLSpecifiedByDirective,
   // "Enum" of Type Kinds

src/type/__tests__/introspection-test.js

@@ -76,6 +76,16 @@ describe('Introspection', () => {
               enumValues: null,
               possibleTypes: null,
             },
+            {
+              kind: 'SCALAR',
+              name: 'Int',
+              specifiedByUrl: null,
+              fields: null,
+              inputFields: null,
+              interfaces: null,
+              enumValues: null,
+              possibleTypes: null,
+            },
             {
               kind: 'OBJECT',
               name: '__Schema',
@@ -961,6 +971,40 @@ describe('Introspection', () => {
                 },
               ],
             },
+            {
+              name: 'stream',
+              isRepeatable: false,
+              locations: ['FIELD'],
+              args: [
+                {
+                  defaultValue: null,
+                  name: 'if',
+                  type: {
+                    kind: 'SCALAR',
+                    name: 'Boolean',
+                    ofType: null,
+                  },
+                },
+                {
+                  defaultValue: null,
+                  name: 'label',
+                  type: {
+                    kind: 'SCALAR',
+                    name: 'String',
+                    ofType: null,
+                  },
+                },
+                {
+                  defaultValue: '0',
+                  name: 'initialCount',
+                  type: {
+                    kind: 'SCALAR',
+                    name: 'Int',
+                    ofType: null,
+                  },
+                },
+              ],
+            },
             {
               name: 'deprecated',
               isRepeatable: false,

src/type/__tests__/schema-test.js

@@ -294,6 +294,7 @@ describe('Type System: Schema', () => {
       'ASub',
       'Boolean',
       'String',
+      'Int',
       '__Schema',
       '__Type',
       '__TypeKind',

src/type/directives.d.ts

@@ -78,6 +78,11 @@ export const GraphQLSkipDirective: GraphQLDirective;
  */
 export const GraphQLDeferDirective: GraphQLDirective;
 
+/**
+ * Used to conditionally stream list fields.
+ */
+export const GraphQLStreamDirective: GraphQLDirective;
+
 /**
  * Used to provide a URL for specifying the behavior of custom scalar definitions.
  */

src/type/directives.js

@@ -17,7 +17,7 @@ import type {
   GraphQLArgument,
   GraphQLFieldConfigArgumentMap,
 } from './definition';
-import { GraphQLString, GraphQLBoolean } from './scalars';
+import { GraphQLString, GraphQLBoolean, GraphQLInt } from './scalars';
 import { argsToArgsConfig, GraphQLNonNull } from './definition';
 
 /**
@@ -193,6 +193,31 @@ export const GraphQLDeferDirective = new GraphQLDirective({
   },
 });
 
+/**
+ * Used to conditionally stream list fields.
+ */
+export const GraphQLStreamDirective = new GraphQLDirective({
+  name: 'stream',
+  description:
+    'Directs the executor to stream plural fields when the `if` argument is true or undefined.',
+  locations: [DirectiveLocation.FIELD],
+  args: {
+    if: {
+      type: GraphQLBoolean,
+      description: 'Stream when true or undefined.',
+    },
+    label: {
+      type: GraphQLString,
+      description: 'Unique name',
+    },
+    initialCount: {
+      defaultValue: 0,
+      type: GraphQLInt,
+      description: 'Number of items to return immediately',
+    },
+  },
+});
+
 /**
  * Constant string used for default reason for a deprecation.
  */
@@ -242,6 +267,7 @@ export const specifiedDirectives = Object.freeze([
   GraphQLIncludeDirective,
   GraphQLSkipDirective,
   GraphQLDeferDirective,
+  GraphQLStreamDirective,
   GraphQLDeprecatedDirective,
   GraphQLSpecifiedByDirective,
 ]);

src/type/index.d.ts

@@ -126,6 +126,7 @@ export {
   GraphQLIncludeDirective,
   GraphQLSkipDirective,
   GraphQLDeferDirective,
+  GraphQLStreamDirective,
   GraphQLDeprecatedDirective,
   GraphQLSpecifiedByDirective,
   // Constant Deprecation Reason

src/type/index.js

@@ -77,6 +77,7 @@ export {
   GraphQLIncludeDirective,
   GraphQLSkipDirective,
   GraphQLDeferDirective,
+  GraphQLStreamDirective,
   GraphQLDeprecatedDirective,
   GraphQLSpecifiedByDirective,
   // Constant Deprecation Reason

src/utilities/__tests__/buildASTSchema-test.js

@@ -21,6 +21,7 @@ import {
   GraphQLDeprecatedDirective,
   GraphQLSpecifiedByDirective,
   GraphQLDeferDirective,
+  GraphQLStreamDirective,
 } from '../../type/directives';
 import {
   GraphQLID,
@@ -158,8 +159,7 @@ describe('Schema Builder', () => {
   it('include standard type only if it is used', () => {
     const schema = buildSchema('type Query');
 
-    // String and Boolean are always included through introspection types
-    expect(schema.getType('Int')).to.equal(undefined);
+    // String, Boolean, and Int are always included through introspection types
     expect(schema.getType('Float')).to.equal(undefined);
     expect(schema.getType('ID')).to.equal(undefined);
   });
@@ -225,10 +225,11 @@ describe('Schema Builder', () => {
   it('Maintains specified directives', () => {
     const schema = buildSchema('type Query');
 
-    expect(schema.getDirectives()).to.have.lengthOf(5);
+    expect(schema.getDirectives()).to.have.lengthOf(6);
     expect(schema.getDirective('skip')).to.equal(GraphQLSkipDirective);
     expect(schema.getDirective('include')).to.equal(GraphQLIncludeDirective);
     expect(schema.getDirective('defer')).to.equal(GraphQLDeferDirective);
+    expect(schema.getDirective('stream')).to.equal(GraphQLStreamDirective);
     expect(schema.getDirective('deprecated')).to.equal(
       GraphQLDeprecatedDirective,
     );
@@ -244,9 +245,10 @@ describe('Schema Builder', () => {
       directive @deprecated on FIELD_DEFINITION
       directive @specifiedBy on FIELD_DEFINITION
       directive @defer on FRAGMENT_SPREAD
+      directive @stream on FIELD
     `);
 
-    expect(schema.getDirectives()).to.have.lengthOf(5);
+    expect(schema.getDirectives()).to.have.lengthOf(6);
     expect(schema.getDirective('skip')).to.not.equal(GraphQLSkipDirective);
     expect(schema.getDirective('include')).to.not.equal(
       GraphQLIncludeDirective,
@@ -258,17 +260,19 @@ describe('Schema Builder', () => {
       GraphQLSpecifiedByDirective,
     );
     expect(schema.getDirective('defer')).to.not.equal(GraphQLDeferDirective);
+    expect(schema.getDirective('stream')).to.not.equal(GraphQLStreamDirective);
   });
 
   it('Adding directives maintains specified directives', () => {
     const schema = buildSchema(`
       directive @foo(arg: Int) on FIELD
     `);
 
-    expect(schema.getDirectives()).to.have.lengthOf(6);
+    expect(schema.getDirectives()).to.have.lengthOf(7);
     expect(schema.getDirective('skip')).to.not.equal(undefined);
     expect(schema.getDirective('include')).to.not.equal(undefined);
     expect(schema.getDirective('defer')).to.not.equal(undefined);
+    expect(schema.getDirective('stream')).to.not.equal(undefined);
     expect(schema.getDirective('deprecated')).to.not.equal(undefined);
     expect(schema.getDirective('specifiedBy')).to.not.equal(undefined);
   });