remove node-fetch as runtime dependency

src/fetchers/fetch.ts

@@ -0,0 +1,22 @@
+/**
+ * This file is a very relaxed definition of the fetch api
+ * Only containing what we need for it to function.
+ */
+
+export type FetchOps = {
+  headers: Record<string, string>;
+  method: string;
+  body: any;
+};
+
+export type FetchHeaders = {
+  get(key: string): string | undefined;
+};
+
+export type FetchReply = {
+  text(): Promise<string>;
+  json(): Promise<any>;
+  headers: FetchHeaders;
+};
+
+export type FetchType = (url: string, ops?: FetchOps) => Promise<FetchReply>;

src/fetchers/simpleProxy.ts

@@ -1,6 +1,5 @@
-import fetch from 'node-fetch';
-
 import { makeFullUrl } from '@/fetchers/common';
+import { FetchType } from '@/fetchers/fetch';
 import { makeStandardFetcher } from '@/fetchers/standardFetch';
 import { Fetcher } from '@/fetchers/types';
 
@@ -10,7 +9,7 @@ const headerMap: Record<string, string> = {
   origin: 'X-Origin',
 };
 
-export function makeSimpleProxyFetcher(proxyUrl: string, f: typeof fetch): Fetcher {
+export function makeSimpleProxyFetcher(proxyUrl: string, f: FetchType): Fetcher {
   const fetcher = makeStandardFetcher(f);
   const proxiedFetch: Fetcher = async (url, ops) => {
     const fullUrl = makeFullUrl(url, ops);

src/fetchers/standardFetch.ts

@@ -1,10 +1,9 @@
-import fetch from 'node-fetch';
-
 import { serializeBody } from '@/fetchers/body';
 import { makeFullUrl } from '@/fetchers/common';
+import { FetchType } from '@/fetchers/fetch';
 import { Fetcher } from '@/fetchers/types';
 
-export function makeStandardFetcher(f: typeof fetch): Fetcher {
+export function makeStandardFetcher(f: FetchType): Fetcher {
   const normalFetch: Fetcher = async (url, ops) => {
     const fullUrl = makeFullUrl(url, ops);
     const seralizedBody = serializeBody(ops.body);