first commit

.gitignore

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+/build/
+/node_modules/

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "type": "node",
+        "request": "launch",
+        "name": "Launch Program",
+        "program": "${workspaceFolder}/src/index.ts",
+        "preLaunchTask": "tsc: build - tsconfig.json",
+        "outFiles": ["${workspaceFolder}/build/**/*.js"]
+      }
+    ]
+  }

README.md

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+# Prepation
+
+``npm init``
+
+See More <https://graphql-code-generator.com/docs/getting-started/installation>
+
+``npm add --save graphql``
+or
+``yarn add graphql``
+
+
+``npm add --save-dev @graphql-codegen/cli``
+or
+``yarn add -D @graphql-codegen/cli``
+
+
+``npx graphql-codegen init``
+
+
+``npm add --save-dev @graphql-codegen/typescript``
+or
+``yarn add -D @graphql-codegen/typescript``
+
+# Server
+
+``npm add apollo-server``
+
+``npm install @types/node --save-dev``
+
+```
+npx tsc --init --rootDir src --outDir build \
+--esModuleInterop --resolveJsonModule --lib es6 \
+--module commonjs --allowJs true --noImplicitAny true
+```
+
+``npm install --save-dev ts-node nodemon rimraf``
+
+
+# UI
+
+* init new Angular project ``ng new graphql-demo``

codegen.yml

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+overwrite: true
+schema: ./src/schema/*.ts
+generates:
+  src/generated/graphql.ts:
+    plugins:
+      - typescript
+      - typescript-resolvers
+      - typescript-graphql-request
+      - typescript-operations
+  ./graphql.schema.json:
+    plugins:
+      - "introspection"

nodemon.json

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+{
+    "watch": ["src"],
+    "ext": ".ts,.js",
+    "ignore": [],
+    "exec": "ts-node ./src/index.ts"
+}

package.json

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+{
+  "name": "graphql-pizza-demo",
+  "version": "1.0.0",
+  "description": "",
+  "main": "build/index.js",
+  "dependencies": {
+    "apollo-server": "^2.15.1",
+    "graphql": "^15.3.0",
+    "typescript": "^3.9.6"
+  },
+  "devDependencies": {
+    "@graphql-codegen/cli": "1.16.3",
+    "@graphql-codegen/introspection": "1.16.3",
+    "@graphql-codegen/typescript": "^1.16.3",
+    "@graphql-codegen/typescript-graphql-request": "^1.16.3",
+    "@graphql-codegen/typescript-operations": "^1.16.3",
+    "@graphql-codegen/typescript-resolvers": "1.16.3",
+    "@types/node": "^14.0.20",
+    "nodemon": "^2.0.4",
+    "rimraf": "^3.0.2",
+    "ts-node": "^8.10.2"
+  },
+  "scripts": {
+    "prebuild": "npm run generate",
+    "prestart": "npm run generate",
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "generate": "graphql-codegen --config codegen.yml",
+    "start": "nodemon",
+    "start:live": "npm run build && node build/index.js",
+    "build": "rimraf ./build && tsc"
+  },
+  "author": "",
+  "license": "ISC"
+}

src/data/pizza-list.ts

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+import { Pizza } from "../generated/graphql";
+import { ToppingList } from "./topping-list";
+import { ToppingResolver } from "../resolver/topping-resolver";
+
+export const PizzaList: Pizza[] = [
+    {
+        id: "0",
+        name: "Tonno",
+        toppings: [
+            ToppingResolver.getByName("Tunna"),
+            ToppingResolver.getByName("Onion")
+        ]
+    },
+    {
+        id: "1",
+        name: "Salami",
+        toppings: [
+            ToppingResolver.getByName("Salami"),
+        ]
+    },
+    {
+        id: "2",
+        name: "420",
+        toppings: [
+            ToppingResolver.getByName("Pineapple"),
+        ]
+    }
+]
+

src/data/topping-list.ts

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+import { Pizza, Topping } from "../generated/graphql";
+
+export const ToppingList: Topping[] = [
+    {
+        id: "1",
+        name: "Tunna",
+    },
+    {
+        id: "2",
+        name: "Onion",
+    },
+    {
+        id: "3",
+        name: "Pineapple",
+    },
+    {
+        id: "4",
+        name: "Salami",
+    },
+    {
+        id: "5",
+        name: "fish sticks",
+    }
+    
+
+]
+

src/generated/graphql.ts

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+import { GraphQLResolveInfo } from 'graphql';
+import { GraphQLClient } from 'graphql-request';
+import { print } from 'graphql';
+import gql from 'graphql-tag';
+export type Maybe<T> = T | null;
+export type Exact<T extends { [key: string]: any }> = { [K in keyof T]: T[K] };
+export type RequireFields<T, K extends keyof T> = { [X in Exclude<keyof T, K>]?: T[X] } & { [P in K]-?: NonNullable<T[P]> };
+/** All built-in and custom scalars, mapped to their actual values */
+export type Scalars = {
+  ID: string;
+  String: string;
+  Boolean: boolean;
+  Int: number;
+  Float: number;
+};
+
+export type Pizza = {
+  __typename?: 'Pizza';
+  id: Scalars['ID'];
+  name: Scalars['String'];
+  toppings: Array<Topping>;
+};
+
+export type Topping = {
+  __typename?: 'Topping';
+  id: Scalars['ID'];
+  name: Scalars['String'];
+};
+
+export type Query = {
+  __typename?: 'Query';
+  getPizzaById: Pizza;
+  getToppingById: Topping;
+  getPizzaByName: Pizza;
+  getToppingByName: Topping;
+  listPizza: Array<Maybe<Pizza>>;
+  listTopping: Array<Maybe<Topping>>;
+};
+
+
+export type QueryGetPizzaByIdArgs = {
+  pizzaId: Scalars['ID'];
+};
+
+
+export type QueryGetToppingByIdArgs = {
+  toppingId: Scalars['ID'];
+};
+
+
+export type QueryGetPizzaByNameArgs = {
+  pizzaName: Scalars['ID'];
+};
+
+
+export type QueryGetToppingByNameArgs = {
+  toppingName: Scalars['ID'];
+};
+
+
+
+export type ResolverTypeWrapper<T> = Promise<T> | T;
+
+
+export type LegacyStitchingResolver<TResult, TParent, TContext, TArgs> = {
+  fragment: string;
+  resolve: ResolverFn<TResult, TParent, TContext, TArgs>;
+};
+
+export type NewStitchingResolver<TResult, TParent, TContext, TArgs> = {
+  selectionSet: string;
+  resolve: ResolverFn<TResult, TParent, TContext, TArgs>;
+};
+export type StitchingResolver<TResult, TParent, TContext, TArgs> = LegacyStitchingResolver<TResult, TParent, TContext, TArgs> | NewStitchingResolver<TResult, TParent, TContext, TArgs>;
+export type Resolver<TResult, TParent = {}, TContext = {}, TArgs = {}> =
+  | ResolverFn<TResult, TParent, TContext, TArgs>
+  | StitchingResolver<TResult, TParent, TContext, TArgs>;
+
+export type ResolverFn<TResult, TParent, TContext, TArgs> = (
+  parent: TParent,
+  args: TArgs,
+  context: TContext,
+  info: GraphQLResolveInfo
+) => Promise<TResult> | TResult;
+
+export type SubscriptionSubscribeFn<TResult, TParent, TContext, TArgs> = (
+  parent: TParent,
+  args: TArgs,
+  context: TContext,
+  info: GraphQLResolveInfo
+) => AsyncIterator<TResult> | Promise<AsyncIterator<TResult>>;
+
+export type SubscriptionResolveFn<TResult, TParent, TContext, TArgs> = (
+  parent: TParent,
+  args: TArgs,
+  context: TContext,
+  info: GraphQLResolveInfo
+) => TResult | Promise<TResult>;
+
+export interface SubscriptionSubscriberObject<TResult, TKey extends string, TParent, TContext, TArgs> {
+  subscribe: SubscriptionSubscribeFn<{ [key in TKey]: TResult }, TParent, TContext, TArgs>;
+  resolve?: SubscriptionResolveFn<TResult, { [key in TKey]: TResult }, TContext, TArgs>;
+}
+
+export interface SubscriptionResolverObject<TResult, TParent, TContext, TArgs> {
+  subscribe: SubscriptionSubscribeFn<any, TParent, TContext, TArgs>;
+  resolve: SubscriptionResolveFn<TResult, any, TContext, TArgs>;
+}
+
+export type SubscriptionObject<TResult, TKey extends string, TParent, TContext, TArgs> =
+  | SubscriptionSubscriberObject<TResult, TKey, TParent, TContext, TArgs>
+  | SubscriptionResolverObject<TResult, TParent, TContext, TArgs>;
+
+export type SubscriptionResolver<TResult, TKey extends string, TParent = {}, TContext = {}, TArgs = {}> =
+  | ((...args: any[]) => SubscriptionObject<TResult, TKey, TParent, TContext, TArgs>)
+  | SubscriptionObject<TResult, TKey, TParent, TContext, TArgs>;
+
+export type TypeResolveFn<TTypes, TParent = {}, TContext = {}> = (
+  parent: TParent,
+  context: TContext,
+  info: GraphQLResolveInfo
+) => Maybe<TTypes> | Promise<Maybe<TTypes>>;
+
+export type IsTypeOfResolverFn<T = {}> = (obj: T, info: GraphQLResolveInfo) => boolean | Promise<boolean>;
+
+export type NextResolverFn<T> = () => Promise<T>;
+
+export type DirectiveResolverFn<TResult = {}, TParent = {}, TContext = {}, TArgs = {}> = (
+  next: NextResolverFn<TResult>,
+  parent: TParent,
+  args: TArgs,
+  context: TContext,
+  info: GraphQLResolveInfo
+) => TResult | Promise<TResult>;
+
+/** Mapping between all available schema types and the resolvers types */
+export type ResolversTypes = {
+  Pizza: ResolverTypeWrapper<Pizza>;
+  ID: ResolverTypeWrapper<Scalars['ID']>;
+  String: ResolverTypeWrapper<Scalars['String']>;
+  Topping: ResolverTypeWrapper<Topping>;
+  Query: ResolverTypeWrapper<{}>;
+  Boolean: ResolverTypeWrapper<Scalars['Boolean']>;
+};
+
+/** Mapping between all available schema types and the resolvers parents */
+export type ResolversParentTypes = {
+  Pizza: Pizza;
+  ID: Scalars['ID'];
+  String: Scalars['String'];
+  Topping: Topping;
+  Query: {};
+  Boolean: Scalars['Boolean'];
+};
+
+export type PizzaResolvers<ContextType = any, ParentType extends ResolversParentTypes['Pizza'] = ResolversParentTypes['Pizza']> = {
+  id?: Resolver<ResolversTypes['ID'], ParentType, ContextType>;
+  name?: Resolver<ResolversTypes['String'], ParentType, ContextType>;
+  toppings?: Resolver<Array<ResolversTypes['Topping']>, ParentType, ContextType>;
+  __isTypeOf?: IsTypeOfResolverFn<ParentType>;
+};
+
+export type ToppingResolvers<ContextType = any, ParentType extends ResolversParentTypes['Topping'] = ResolversParentTypes['Topping']> = {
+  id?: Resolver<ResolversTypes['ID'], ParentType, ContextType>;
+  name?: Resolver<ResolversTypes['String'], ParentType, ContextType>;
+  __isTypeOf?: IsTypeOfResolverFn<ParentType>;
+};
+
+export type QueryResolvers<ContextType = any, ParentType extends ResolversParentTypes['Query'] = ResolversParentTypes['Query']> = {
+  getPizzaById?: Resolver<ResolversTypes['Pizza'], ParentType, ContextType, RequireFields<QueryGetPizzaByIdArgs, 'pizzaId'>>;
+  getToppingById?: Resolver<ResolversTypes['Topping'], ParentType, ContextType, RequireFields<QueryGetToppingByIdArgs, 'toppingId'>>;
+  getPizzaByName?: Resolver<ResolversTypes['Pizza'], ParentType, ContextType, RequireFields<QueryGetPizzaByNameArgs, 'pizzaName'>>;
+  getToppingByName?: Resolver<ResolversTypes['Topping'], ParentType, ContextType, RequireFields<QueryGetToppingByNameArgs, 'toppingName'>>;
+  listPizza?: Resolver<Array<Maybe<ResolversTypes['Pizza']>>, ParentType, ContextType>;
+  listTopping?: Resolver<Array<Maybe<ResolversTypes['Topping']>>, ParentType, ContextType>;
+};
+
+export type Resolvers<ContextType = any> = {
+  Pizza?: PizzaResolvers<ContextType>;
+  Topping?: ToppingResolvers<ContextType>;
+  Query?: QueryResolvers<ContextType>;
+};
+
+
+/**
+ * @deprecated
+ * Use "Resolvers" root object instead. If you wish to get "IResolvers", add "typesPrefix: I" to your config.
+ */
+export type IResolvers<ContextType = any> = Resolvers<ContextType>;
+
+
+
+export type SdkFunctionWrapper = <T>(action: () => Promise<T>) => Promise<T>;
+
+
+const defaultWrapper: SdkFunctionWrapper = sdkFunction => sdkFunction();
+export function getSdk(client: GraphQLClient, withWrapper: SdkFunctionWrapper = defaultWrapper) {
+  return {
+
+  };
+}
+export type Sdk = ReturnType<typeof getSdk>;

src/index.ts

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+import { ApolloServer } from "apollo-server";
+import { Resolvers } from "./generated/graphql";
+import { pizzaSchema } from "./schema/pizza";
+import { PizzaResolver } from "./resolver/pizza-resolver";
+import { ToppingResolver } from "./resolver/topping-resolver";
+
+
+
+const resolvers: Resolvers = {
+    Topping: {
+        id: (root, args, context) => {
+            return root.id
+        },
+        name: (root, args, context) => {
+            return root.name
+        },
+    },
+    Pizza: {
+        id: (root, args, context) => {
+            return root.id
+        },
+        name: (root, args, context) => {
+            return root.name
+        },
+        toppings: (root, args, context) => {
+            return root.toppings
+        },
+    },
+    Query: {
+        getPizzaById: (root, args, context) => {
+            return PizzaResolver.getById(args.pizzaId);
+        },
+        getPizzaByName: (root, args, context) => {
+            return PizzaResolver.getByName(args.pizzaName);
+        },
+        listPizza: (root, args, context) => {
+            return PizzaResolver.list();
+        },
+        getToppingById: (root, args, context) => {
+            return ToppingResolver.getById(args.toppingId);
+        },
+        getToppingByName: (root, args, context) => {
+            return ToppingResolver.getByName(args.toppingName);
+        },
+        listTopping: (root, args, context) => {
+            return ToppingResolver.list();
+        },
+    }
+}
+
+const server = new ApolloServer({
+    typeDefs: pizzaSchema,
+    resolvers: resolvers as any
+});
+
+server.listen().then(({ url }) => {
+    console.log(`🚀 Server ready at ${url}`)
+});

src/resolver/pizza-resolver.ts

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+import { Topping, Pizza, } from "../generated/graphql";
+import { PizzaList } from "../data/pizza-list";
+export class PizzaResolver {
+
+    static getById = (id: string): Pizza => {
+        return PizzaList.filter(pizza => pizza.id === id)[0];
+    };
+
+    static list = (): Pizza[] => {
+        return PizzaList;
+    };
+
+    static getByName = (name: string): Pizza => {
+        return PizzaList.filter(pizza => pizza.name === name)[0];
+    };
+
+}

src/resolver/topping-resolver.ts

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+import { Topping, } from "../generated/graphql";
+import { ToppingList } from "../data/topping-list";
+export class ToppingResolver {
+    static getById = (id: string): Topping => {
+        return ToppingList.filter(topping => topping.id === id)[0];
+    };
+
+    static getByName = (name: string): Topping => {
+        return ToppingList.filter(topping => topping.name === name)[0];
+    };
+
+    static list = (): Topping[] => {
+        return ToppingList;
+    };
+
+}

src/schema/pizza.ts

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+
+import gql from "graphql-tag";
+
+export const pizzaSchema = gql`
+  type Pizza {
+    id: ID!
+    name: String!
+    toppings: [Topping!]!
+  }
+
+  type Topping {
+    id: ID!
+    name: String!
+  }
+
+  type Query {
+    getPizzaById(pizzaId: ID!): Pizza!
+    getToppingById(toppingId: ID!): Topping!
+    getPizzaByName(pizzaName: ID!): Pizza!
+    getToppingByName(toppingName: ID!): Topping!
+    listPizza: [Pizza]!
+    listTopping: [Topping]!
+  }
+`;

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
+    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
+    "lib": [
+      "es6"
+    ] /* Specify library files to be included in the compilation. */,
+    "allowJs": true /* Allow javascript files to be compiled. */,
+    "outDir": "build" /* Redirect output structure to the directory. */,
+    "rootDir": "src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
+    "strict": true /* Enable all strict type-checking options. */,
+    "skipLibCheck": true,
+    "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
+    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
+    "resolveJsonModule": true /* Include modules imported with '.json' extension */,
+    "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */,
+    "sourceMap": true,
+    
+  }
+}