chore: use ts-graft to include requisite types from dom lib

.gitignore

@@ -2,6 +2,7 @@
 *.log
 test.ponyfill.js
 test.polyfill.js
+dom.d.ts
 
 # OSX
 #

.ts-graftrc.js

@@ -0,0 +1,9 @@
+module.exports = {
+  grafts: [
+    {
+      source: "typescript/lib/lib.dom.d.ts",
+      output: "dom.d.ts",
+      include: ["RequestInit", "RequestInfo", "Response"],
+    },
+  ],
+};

Makefile

@@ -4,7 +4,7 @@ node_modules: package.json
 	npm install && /usr/bin/touch node_modules
 
 build: node_modules
-	npx rollup -c && /usr/bin/touch dist
+	npx ts-graft && npx rollup -c && /usr/bin/touch dist
 
 cov:
 	npx nyc report --reporter=text-lcov > .reports/coverage.lcov && npx codecov

index.d.ts

@@ -1,14 +1,27 @@
-/// <reference lib="dom" />
+import {
+  Request,
+  Response,
+  Headers,
+  RequestInfo,
+  RequestInit
+} from "./dom"
 
-declare const _fetch: typeof fetch;
-declare const _Request: typeof Request;
-declare const _Response: typeof Response;
-declare const _Headers: typeof Headers;
 
 declare module "cross-fetch" {
-  export const fetch: typeof _fetch;
-  export const Request: typeof _Request;
-  export const Response: typeof _Response;
-  export const Headers: typeof _Headers;
+  export const fetch: (input: RequestInfo, init?: RequestInit) => Promise<Response>;
+  export const Request: {
+    prototype: Request;
+    new(input: RequestInfo, init?: RequestInit): Request;
+  };
+  export const Response: {
+    prototype: Response;
+    new(body?: BodyInit | null, init?: ResponseInit): Response;
+    error(): Response;
+    redirect(url: string, status?: number): Response;
+  };
+  export const Headers: {
+    prototype: Headers;
+    new(init?: HeadersInit): Headers;
+  };
   export default fetch;
 }

package.json

@@ -77,13 +77,16 @@
     "serve-index": "1.9.1",
     "sinon": "9.2.4",
     "standard": "16.0.3",
+    "ts-graft": "1.0.1",
+    "typescript": "4.2.3",
     "webpack": "5.19.0",
     "webpack-cli": "4.4.0",
     "whatwg-fetch": "3.0.0"
   },
   "files": [
     "dist",
     "polyfill",
+    "dom.d.ts",
     "index.d.ts"
   ],
   "keywords": [