feat(TypeComposer): add method isFieldNonNull

graphql-compose · Apr 27, 2018 · 8867567 · 8867567
1 parent 5478dd4
commit 8867567
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diff --git a/src/TypeComposer.d.ts b/src/TypeComposer.d.ts
@@ -212,6 +212,8 @@ export class TypeComposer<TContext> {
 
     public getFieldTC(fieldName: string): TypeComposer<TContext>;
 
+    public isFieldNonNull(fieldName: string): boolean;
+
     public makeFieldNonNull(fieldNameOrArray: string | string[]): TypeComposer<TContext>;
 
     public makeFieldNullable(fieldNameOrArray: string | string[]): TypeComposer<TContext>;

diff --git a/src/TypeComposer.js b/src/TypeComposer.js
@@ -629,6 +629,10 @@ export class TypeComposer<TContext> {
     return this.constructor.schemaComposer.TypeComposer.createTemp(fieldType);
   }
 
+  isFieldNonNull(fieldName: string): boolean {
+    return this.getFieldType(fieldName) instanceof GraphQLNonNull;
+  }
+
   makeFieldNonNull(fieldNameOrArray: string | Array<string>): TypeComposer<TContext> {
     const fieldNames = Array.isArray(fieldNameOrArray) ? fieldNameOrArray : [fieldNameOrArray];
     fieldNames.forEach(fieldName => {

diff --git a/src/__tests__/TypeComposer-test.js b/src/__tests__/TypeComposer-test.js
@@ -261,6 +261,13 @@ describe('TypeComposer', () => {
       });
     });
 
+    it('isFieldNonNull()', () => {
+      tc.setField('fieldNN', 'String');
+      expect(tc.isFieldNonNull('fieldNN')).toBe(false);
+      tc.setField('fieldNN', 'String!');
+      expect(tc.isFieldNonNull('fieldNN')).toBe(true);
+    });
+
     it('makeFieldNonNull()', () => {
       tc.setField('fieldNN', 'String');
       expect(tc.getFieldType('fieldNN')).toBe(GraphQLString);