From fa239e714705d2f4c2977bee4f5e13497181fa43 Mon Sep 17 00:00:00 2001
From: Lebedev Konstantin <ibnrubaxa@gmail.com>
Date: Tue, 2 Mar 2021 14:07:04 +0300
Subject: [PATCH] feat: + dts (draft)

---
 dts/fetch.ts   | 22 +++++++++++++
 dts/typings.ts | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 dts/fetch.ts
 create mode 100644 dts/typings.ts

diff --git a/dts/fetch.ts b/dts/fetch.ts
new file mode 100644
index 0000000..6a7574c
--- /dev/null
+++ b/dts/fetch.ts
@@ -0,0 +1,22 @@
+import {
+	EndpointMap,
+	TypedFetch,
+	TypeFetchReqyestInit,
+	TypedFetchResponse,
+} from './typings';
+
+export function createTypedFetch<T extends EndpointMap>(originalFetch: typeof fetch): TypedFetch<T> {
+	return <U extends keyof T>(url: U, init: TypeFetchReqyestInit<T[U]['request']>) => {
+		const query = new URLSearchParams(Object(init.body));
+		const fetchInit = {...Object(init)} as RequestInit;
+		let fetchUrl = url as string;
+
+		if (init.method === 'GET') {
+			fetchUrl += `?${query}`;
+		} else {
+			fetchInit.body = query;
+		}
+
+		return originalFetch(fetchUrl, fetchInit) as TypedFetchResponse<U, T[U]['response']>;
+	};
+}
diff --git a/dts/typings.ts b/dts/typings.ts
new file mode 100644
index 0000000..91a2c6b
--- /dev/null
+++ b/dts/typings.ts
@@ -0,0 +1,86 @@
+export type EndpointAccess = {
+	headers?: object;
+	params: object;
+};
+
+export type Endpoint = {
+	access: EndpointAccess;
+
+    request: {
+        method: 'GET' | 'POST';
+		
+		headers?: {
+			[key: string]: string | undefined;
+		};
+
+        params: {
+			[key: string]: string | number | boolean | undefined
+		};
+    };
+
+    response: {
+        headers?: {
+			[key: string]: string | undefined;
+		};
+
+        body: {
+            status: number;
+            body: any;
+        };
+    };
+};
+
+export type EndpointMap = {
+    [url: string]: Endpoint;
+};
+
+export type TypedFetch<T extends EndpointMap> = <
+    U extends keyof T,
+>(
+    url: U,
+    init: TypeFetchReqyestInit<T[U]['request']>,
+) => TypedFetchResponse<U, T[U]['response']>;
+
+export type TypeFetchReqyestInit<
+    R extends Endpoint['request'],
+> = (
+    & Pick<RequestInit, 
+        | 'cache'
+        | 'credentials'
+        | 'integrity'
+        | 'keepalive'
+        | 'mode'
+        | 'redirect'
+        | 'referrer'
+        | 'referrerPolicy'
+        | 'signal'
+        | 'window'
+    >
+    & {
+        method: R['method'];
+        body: R['params'];
+    }
+);
+
+export type TypedFetchResponse<U, R extends Endpoint['response']> = Promise<(
+    & Pick<Response,
+        | 'arrayBuffer'
+        | 'blob'
+        | 'body'
+        | 'bodyUsed'
+        | 'clone'
+        | 'formData'
+        | 'headers'
+        | 'ok'
+        | 'redirected'
+        | 'status'
+        | 'statusText'
+        | 'text'
+        | 'trailer'
+        | 'type'
+    >
+    & {
+		url: U;
+        json(): Promise<R['body']>;
+    }
+)>;