add koa-graphql types (#36619)

* add koa-graphql types

* fix ts version

* fix tests and lint

types/koa-graphql/index.d.ts

@@ -0,0 +1,83 @@
+// Type definitions for koa-graphql 0.8
+// Project: https://github.com/chentsulin/koa-graphql
+// Definitions by: Matheus Gonçalves da Silva <https://github.com/PlayMa256>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+/// <reference types="node" />
+
+import { Context, Request, Response, Middleware } from "koa";
+import {
+    GraphQLError,
+    GraphQLSchema,
+    GraphQLFieldResolver,
+    ValidationContext,
+    ASTVisitor
+} from "graphql";
+import { GraphQLParams, RequestInfo } from "express-graphql";
+
+export type Options =
+    | ((request: Request, repsonse: Response, ctx: Context) => OptionsResult)
+    | OptionsResult;
+
+export type OptionsResult = OptionsData | Promise<OptionsData>;
+
+export interface OptionsData {
+    /**
+     * A GraphQL schema from graphql-js.
+     */
+    schema: GraphQLSchema;
+
+    /**
+     * A value to pass as the context to this middleware.
+     */
+    context?: any;
+
+    /**
+     * An object to pass as the rootvalue to the graphql() function.
+     */
+    rootValue?: any;
+
+    /**
+     * A boolean to configure whether the output should be pretty-printed.
+     */
+    pretty?: boolean;
+
+    /**
+     * An optional function which will be used to format any errors produced by
+     * fulfilling a GraphQL operation. If no function is provided, GraphQL's
+     * default spec-compliant `formatError` function will be used.
+     */
+    formatError?: (error: GraphQLError, context?: any) => any;
+
+    /**
+     * An optional array of validation rules that will be applied on the document
+     * in addition to those defined by the GraphQL spec.
+     */
+    validationRules?: Array<(arg0: ValidationContext) => ASTVisitor>;
+
+    /**
+     * An optional function for adding additional metadata to the GraphQL response
+     * as a key-value object. The result will be added to "extensions" field in
+     * the resulting JSON. This is often a useful place to add development time
+     * info such as the runtime of a query or the amount of resources consumed.
+     *
+     * Information about the request is provided to be used.
+     *
+     * This function may be async.
+     */
+    extensions?: (info: RequestInfo) => { [key: string]: any };
+
+    /**
+     * A boolean to optionally enable GraphiQL mode.
+     */
+    graphiql?: boolean;
+
+    /**
+     * A resolver function to use when one is not provided by the schema.
+     * If not provided, the default field resolver is used (which looks for a
+     * value or method on the source value with the field's name).
+     */
+    fieldResolver?: GraphQLFieldResolver<any, any>;
+}
+
+export default function graphqlHTTP(options: Options): Middleware;

types/koa-graphql/koa-graphql-tests.ts

@@ -0,0 +1,19 @@
+import * as Koa from 'koa';
+import * as mount from 'koa-mount';
+import graphqlHTTP from 'koa-graphql';
+import { buildSchema } from 'graphql';
+
+const schema = buildSchema(`type Query { hello: String }`);
+
+const app = new Koa();
+
+app.use(
+    mount(
+        '/graphql',
+        graphqlHTTP(req => {
+            return {
+                schema,
+            };
+        })
+    )
+);

types/koa-graphql/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "esnext.asynciterable"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "strictFunctionTypes": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "koa-graphql-tests.ts"
+    ]
+}

types/koa-graphql/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }