Dev

README.md

@@ -9,11 +9,10 @@ types to make it type-safed when developing GraphQL server (mainly resolvers)
 
 ## Features
 
-### Generate Typescript from Schema Definition
-### Support [Typescript string enum](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-25) with fallback to string union (fallback not tested yet)
-### Convert GraphQL description into JSDoc
-### Also add deprecated field and reason into JSDoc
+### Generate Typescript from Schema Definition (1-1 mapping from GQL type to TypeScript)
+### Convert GraphQL description into JSDoc, include deprecated directive
 ### [Generate TypeScripts to support writing resolvers](#type-resolvers)
+### [VSCode extension](#https://github.com/liyikun/vscode-graphql-schema-typescript) (credit to [@liyikun](https://github.com/liyikun))
 
 ## Usage
 
@@ -52,7 +51,7 @@ The file generated will have some types that can make it type-safed when writing
 * Parent type and resolve result is default to `any`, but could be overwritten in your code
 
 For example, if you schema is like this:
-```
+```gql
 schema {
     query: RootQuery
 }
@@ -129,24 +128,15 @@ export interface RootQueryToUsersResolver<TParent = undefined, TResult = Array<G
 }
 ```
 
-## TODO
-- [ ] More detailed API Documentation
-- [ ] Integrate with Travis CI
-
-## Change log
-* v1.2.2:
-    * Strategy for guessing TParent & TResult in resolvers
-* v1.2.1:
-    * Added strict nulls option for compatibility with apollo-codegen
-* v1.2.0:
-    * Field resolvers under subscriptions are being generated with resolve and subscribe method
-* v1.1.0:
-    * Add CLIs support
-* v1.0.6:
-    * Generate TypeScript for resolvers. See [Type Resolvers](#type-resolvers)
-* v1.0.4: 
-    * If types is generated under global scope, use string union instead of string enum
-
-* v1.0.2: 
-    * Change default prefix from `GQL_` to `GQL`
-    * Add config options: allow to generate types under a global or namespace declaration
+```javascript
+// in v1.12.11, asyncResult also accept string value 'always', 
+// which will make returns value of resolve functions to be `Promise<TResult>`,
+// due to an issue with VSCode that not showing auto completion when returns is a mix of `T | Promise<T>` (see [#17](https://github.com/dangcuuson/graphql-schema-typescript/issues/17))
+
+// smartTParent: true
+// smartTResult: true
+// asyncResult: 'always'
+export interface RootQueryToUsersResolver<TParent = undefined, TResult = Array<GQLUser> {
+  (parent: TParent, args: RootQueryToUsersArgs, context: any, info: GraphQLResolveInfo): Promise<TResult>; // the different is here
+
+```

package.json

@@ -1,6 +1,6 @@
 {
   "name": "graphql-schema-typescript",
-  "version": "1.2.10",
+  "version": "1.3.1",
   "description": "Generate TypeScript from GraphQL's schema type definitions",
   "main": "./lib/index.js",
   "types": "./lib/index.d.ts",
@@ -55,4 +55,4 @@
       "json"
     ]
   }
-}
+}

src/__tests__/__snapshots__/option.global_nameSpace.test.ts.snap

@@ -61,8 +61,29 @@ declare global {
      * In the future, this will be changed by having User as interface
      * and implementing multiple User
      */
-    export type GQLUserRole = 'sysAdmin' | 'manager' | 'clerk' | 'employee';
-    // NOTE: enum UserRole is generate as string union instead of string enum because the types is generated under global scope
+    export const enum GQLUserRole {
+
+      /**
+       * System Administrator
+       */
+      sysAdmin = 'sysAdmin',
+
+      /**
+       * Manager - Have access to manage functions
+       */
+      manager = 'manager',
+
+      /**
+       * General Staff
+       */
+      clerk = 'clerk',
+
+      /**
+       * 
+       * @deprecated Use 'clerk' instead
+       */
+      employee = 'employee'
+    }
 
     export interface GQLIProduct {
       id: string;
@@ -577,7 +598,7 @@ declare global {
 }"
 `;
 
-exports[`global + namespace should wrap types in global and use string union if global is configured 1`] = `
+exports[`global + namespace should wrap types in global and use const enum if global is configured 1`] = `
 "/* tslint:disable */
 /* eslint-disable */
 import { GraphQLResolveInfo, GraphQLScalarType } from 'graphql';
@@ -637,8 +658,29 @@ declare global {
    * In the future, this will be changed by having User as interface
    * and implementing multiple User
    */
-  export type GQLUserRole = 'sysAdmin' | 'manager' | 'clerk' | 'employee';
-  // NOTE: enum UserRole is generate as string union instead of string enum because the types is generated under global scope
+  export const enum GQLUserRole {
+
+    /**
+     * System Administrator
+     */
+    sysAdmin = 'sysAdmin',
+
+    /**
+     * Manager - Have access to manage functions
+     */
+    manager = 'manager',
+
+    /**
+     * General Staff
+     */
+    clerk = 'clerk',
+
+    /**
+     * 
+     * @deprecated Use 'clerk' instead
+     */
+    employee = 'employee'
+  }
 
   export interface GQLIProduct {
     id: string;
@@ -1162,7 +1204,7 @@ import { GraphQLResolveInfo, GraphQLScalarType } from 'graphql';
  */
 
 
-namespace MyNamespace {
+declare namespace MyNamespace {
   /*******************************
    *                             *
    *          TYPE DEFS          *
@@ -1210,7 +1252,7 @@ namespace MyNamespace {
    * In the future, this will be changed by having User as interface
    * and implementing multiple User
    */
-  export enum GQLUserRole {
+  export const enum GQLUserRole {
 
     /**
      * System Administrator

src/__tests__/option.global_nameSpace.test.ts

@@ -1,15 +1,15 @@
 import { executeApiTest } from './testUtils';
 
 describe('global + namespace', () => {
-    it('should wrap types in global and use string union if global is configured', async () => {
+    it('should wrap types in global and use const enum if global is configured', async () => {
         const generated = await executeApiTest('global.ts', { global: true });
         expect(generated).toContain('declare global {');
-        expect(generated).toContain(`export type GQLUserRole = 'sysAdmin' | 'manager' | 'clerk' | 'employee';`);
+        expect(generated).toContain(`export const enum GQLUserRole {`);
     });
 
     it('should wrap types in namespace if namespace is configured', async () => {
         const generated = await executeApiTest('global.ts', { namespace: 'MyNamespace' });
-        expect(generated).toContain('namespace MyNamespace {');
+        expect(generated).toContain('declare namespace MyNamespace {');
     });
 
     it('should have no conflict between global and namespace config', async () => {

src/cli.ts

@@ -72,7 +72,7 @@ yargs
     })
     .option(asyncResult, {
         desc: 'Set return type of resolver to `TResult | Promise<TResult>`',
-        boolean: true
+        choices: [true, 'always']
     })
     .option(requireResolverTypes, {
         desc: 'Set resolvers to be required. Useful to ensure no resolvers is missing',

src/index.ts

@@ -36,7 +36,11 @@ const typeResolversDecoration = [
     ' *********************************/'
 ];
 
-export const generateTSTypesAsString = async (schema: GraphQLSchema | string, options: GenerateTypescriptOptions): Promise<string> => {
+export const generateTSTypesAsString = async (
+    schema: GraphQLSchema | string,
+    outputPath: string,
+    options: GenerateTypescriptOptions
+): Promise<string> => {
     const mergedOptions = { ...defaultOptions, ...options };
 
     let introspectResult: IntrospectionQuery;
@@ -62,7 +66,7 @@ export const generateTSTypesAsString = async (schema: GraphQLSchema | string, op
         introspectResult = await introspectSchema(schema);
     }
 
-    const tsGenerator = new TypeScriptGenerator(mergedOptions, introspectResult);
+    const tsGenerator = new TypeScriptGenerator(mergedOptions, introspectResult, outputPath);
     const typeDefs = await tsGenerator.generate();
 
     let typeResolvers: GenerateResolversResult = {
@@ -83,7 +87,8 @@ export const generateTSTypesAsString = async (schema: GraphQLSchema | string, op
 
     if (mergedOptions.namespace) {
         body = [
-            `namespace ${options.namespace} {`,
+            // if namespace is under global, it doesn't need to be declared again
+            `${mergedOptions.global ? '' : 'declare '}namespace ${options.namespace} {`,
             ...body,
             '}'
         ];
@@ -108,6 +113,6 @@ export async function generateTypeScriptTypes(
     outputPath: string,
     options: GenerateTypescriptOptions = defaultOptions
 ) {
-    const content = await generateTSTypesAsString(schema, options);
+    const content = await generateTSTypesAsString(schema, outputPath, options);
     fs.writeFileSync(outputPath, content, 'utf-8');
 }

src/types.ts

@@ -81,12 +81,13 @@ export interface GenerateTypescriptOptions {
     /**
      * This option is for resolvers
      * If true, set return type of resolver to `TResult | Promise<TResult>`
+     * If 'awalys', set return type of resolver to `Promise<TResult>`
      * 
      * e.g: interface QueryToUsersResolver<TParent = any, TResult = any> {
      *  (parent: TParent, args: {}, context: any, info): TResult extends Promise ? TResult : TResult | Promise<TResult>
      * }
      */
-    asyncResult?: boolean;
+    asyncResult?: boolean | 'always';
 
     /**
      * If true, field resolver of each type will be required, instead of optional

src/typescriptGenerator.ts

@@ -22,7 +22,8 @@ export class TypeScriptGenerator {
 
     constructor(
         protected options: GenerateTypescriptOptions,
-        protected introspectResult: IntrospectionQuery
+        protected introspectResult: IntrospectionQuery,
+        protected outputPath: string
     ) { }
 
     public async generate(): Promise<string[]> {
@@ -94,14 +95,6 @@ export class TypeScriptGenerator {
             return this.createUnionType(enumType.name, enumType.enumValues.map(v => `'${v.name}'`));
         }
 
-        // if generate as global, don't generate string enum as it requires import
-        if (this.options.global) {
-            return [
-                ...this.createUnionType(enumType.name, enumType.enumValues.map(v => `'${v.name}'`)),
-                `// NOTE: enum ${enumType.name} is generate as string union instead of string enum because the types is generated under global scope`
-            ];
-        }
-
         let enumBody = enumType.enumValues.reduce<string[]>(
             (prevTypescriptDefs, enumValue, index) => {
                 let typescriptDefs: string[] = [];
@@ -125,8 +118,14 @@ export class TypeScriptGenerator {
             []
         );
 
+        // if code is generated as type declaration, better use export const enum instead
+        // of just export enum
+        const isGeneratingDeclaration = this.options.global
+            || !!this.options.namespace
+            || this.outputPath.endsWith('.d.ts');
+        const enumModifier = isGeneratingDeclaration ? ' const ' : ' ';
         return [
-            `export enum ${this.options.typePrefix}${enumType.name} {`,
+            `export${enumModifier}enum ${this.options.typePrefix}${enumType.name} {`,
             ...enumBody,
             '}'
         ];
@@ -136,7 +135,7 @@ export class TypeScriptGenerator {
         objectType: IntrospectionObjectType | IntrospectionInputObjectType | IntrospectionInterfaceType,
         allGQLTypes: IntrospectionType[]
     ): string[] {
-        let fields: (IntrospectionInputValue | IntrospectionField)[]
+        const fields: (IntrospectionInputValue | IntrospectionField)[]
             = objectType.kind === 'INPUT_OBJECT' ? objectType.inputFields : objectType.fields;
 
         const extendTypes: string[] = objectType.kind === 'OBJECT'
@@ -158,7 +157,7 @@ export class TypeScriptGenerator {
                     return prevTypescriptDefs;
                 }
 
-                let fieldJsDoc = descriptionToJSDoc(field);
+                const fieldJsDoc = descriptionToJSDoc(field);
                 const { fieldName, fieldType } = createFieldRef(field, this.options.typePrefix, this.options.strictNulls);
                 const fieldNameAndType = `${fieldName}: ${fieldType};`;
                 let typescriptDefs = [...fieldJsDoc, fieldNameAndType];
@@ -252,12 +251,12 @@ export class TypeScriptGenerator {
      *      | ...
      */
     private createUnionType(typeName: string, possibleTypes: string[]): string[] {
-        let result = `export type ${this.options.typePrefix}${typeName} = ${possibleTypes.join(' | ')};`;
+        const result = `export type ${this.options.typePrefix}${typeName} = ${possibleTypes.join(' | ')};`;
         if (result.length <= 80) {
             return [result];
         }
 
-        let [firstLine, rest] = result.split('=');
+        const [firstLine, rest] = result.split('=');
 
         return [
             firstLine + '=',

src/typescriptResolverGenerator.ts

@@ -116,7 +116,7 @@ export class TSResolverGenerator {
     private generateTypeResolver(type: IntrospectionUnionType | IntrospectionInterfaceType) {
         const possbileTypes = type.possibleTypes.map(pt => `'${pt.name}'`);
         const interfaceName = `${this.options.typePrefix}${type.name}TypeResolver`;
-        const infoModifier = this.options.optionalResolverInfo ? '?' : ''; 
+        const infoModifier = this.options.optionalResolverInfo ? '?' : '';
 
         this.resolverInterfaces.push(...[
             `export interface ${interfaceName}<TParent = ${this.guessTParent(type.name)}> {`,
@@ -164,8 +164,13 @@ export class TSResolverGenerator {
             const TParent = this.guessTParent(objectType.name);
             const TResult = this.guessTResult(field);
             const infoModifier = this.options.optionalResolverInfo ? '?' : '';
-            const returnType = this.options.asyncResult ? 'TResult | Promise<TResult>' : 'TResult';
-            const subscriptionReturnType = 
+            const returnType =
+                this.options.asyncResult === 'always'
+                    ? 'Promise<TResult>'
+                    : !!this.options.asyncResult
+                        ? 'TResult | Promise<TResult>'
+                        : 'TResult';
+            const subscriptionReturnType =
                 this.options.asyncResult ? 'AsyncIterator<TResult> | Promise<AsyncIterator<TResult>>' : 'AsyncIterator<TResult>';
             const fieldResolverTypeDef = !isSubscription
                 ? [
@@ -179,7 +184,7 @@ export class TSResolverGenerator {
                     // tslint:disable-next-line:max-line-length
                     `resolve${this.getModifier()}: (parent: TParent, args: ${argsType}, context: ${this.contextType}, info${infoModifier}: GraphQLResolveInfo) => ${returnType};`,
                     // tslint:disable-next-line:max-line-length
-                    `subscribe: (parent: TParent, args: ${argsType}, context: ${this.contextType}, info${infoModifier}: GraphQLResolveInfo) => ${subscriptionReturnType};`, 
+                    `subscribe: (parent: TParent, args: ${argsType}, context: ${this.contextType}, info${infoModifier}: GraphQLResolveInfo) => ${subscriptionReturnType};`,
                     '}',
                     ''
                 ];