Fixed bugs around invariants

src/parser.ts

@@ -29,7 +29,7 @@ export function parser(document: DocumentNode): IDocumentDefinition {
     Saftey checks for proper usage of react-apollo
 
   */
-  invariant((!!document || !!document.kind),
+  invariant((!!document && !!document.kind),
     // tslint:disable-line
     `Argument of ${document} passed to parser was not a valid GraphQL DocumentNode. You may need to use 'graphql-tag' or another method to convert your operation into a document`
   );
@@ -50,31 +50,27 @@ export function parser(document: DocumentNode): IDocumentDefinition {
     (x: DefinitionNode) => x.kind === 'OperationDefinition' && x.operation === 'subscription'
   );
 
-  if (fragments.length && (!queries.length || !mutations.length || !subscriptions.length)) {
-    invariant(true,
-      `Passing only a fragment to 'graphql' is not yet supported. You must include a query, subscription or mutation as well`
-    );
-  }
+  invariant(!fragments.length || (queries.length || mutations.length || subscriptions.length),
+    `Passing only a fragment to 'graphql' is not yet supported. You must include a query, subscription or mutation as well`
+  );
+
+
+  invariant(((queries.length + mutations.length + subscriptions.length) <= 1),
+    // tslint:disable-line
+    `react-apollo only supports a query, subscription, or a mutation per HOC. ${document} had ${queries.length} queries, ${subscriptions.length} subscriptions and ${mutations.length} muations. You can use 'compose' to join multiple operation types to a component`
+  );
 
-  if (queries.length && mutations.length && mutations.length) {
-    invariant(((queries.length + mutations.length + mutations.length) > 1),
-      // tslint:disable-line
-      `react-apollo only supports a query, subscription, or a mutation per HOC. ${document} had ${queries.length} queries, ${subscriptions.length} subscriptions and ${mutations.length} muations. You can use 'compose' to join multiple operation types to a component`
-    );
-  }
 
   type = queries.length ? DocumentType.Query : DocumentType.Mutation;
   if (!queries.length && !mutations.length) type = DocumentType.Subscription;
 
   const definitions = queries.length ? queries :
     (mutations.length ? mutations : subscriptions);
 
-  if (definitions.length !== 1) {
-    invariant((definitions.length !== 1),
-      // tslint:disable-line
-      `react-apollo only supports one defintion per HOC. ${document} had ${definitions.length} definitions. You can use 'compose' to join multiple operation types to a component`
-    );
-  }
+  invariant(definitions.length === 1,
+    // tslint:disable-line
+    `react-apollo only supports one defintion per HOC. ${document} had ${definitions.length} definitions. You can use 'compose' to join multiple operation types to a component`
+  );
 
   const definition = definitions[0] as OperationDefinitionNode;
   variables = definition.variableDefinitions || [];

test/parser.test.ts

@@ -18,9 +18,7 @@ describe('parser', () => {
       mutation ($t: String) { addT(t: $t) { user { name } } }
     `;
 
-    try { parser(query); } catch (e) {
-      expect(e).toMatch(/Invariant Violation/);
-    }
+    expect(parser.bind(null, query)).toThrowError(/react-apollo only supports/);
   });
 
   it('should error if multiple operations are present', () => {
@@ -29,9 +27,15 @@ describe('parser', () => {
       query Two { user { name } }
     `;
 
-    try { parser(query); } catch (e) {
-      expect(e).toMatch(/Invariant Violation/);
-    }
+    expect(parser.bind(null, query)).toThrowError(/react-apollo only supports/);
+  });
+
+  it('should error if not a DocumentNode', () => {
+    const query = `
+      query One { user { name } }
+    `;
+
+    expect(parser.bind(null, query)).toThrowError(/not a valid GraphQL DocumentNode/);
   });
 
   it('should return the name of the operation', () => {

test/react-web/client/graphql/fragments.test.tsx

@@ -38,7 +38,7 @@ describe('fragments', () => {
       renderer.create(<ApolloProvider client={client}><Container /></ApolloProvider>);
       throw new Error();
     } catch (e) {
-      expect(e.name).toMatch(/TypeError/);
+      expect(e.name).toMatch(/Invariant Violation/);
     }
   });