Add ESLint (#941)

* Add eslint, switch to lint-staged for precommit

* Fix all ESLint errors

* Update GH workflow to check prettier and eslint

3 files changed, 14 insertions, 10 deletions

diff --git a/src/gateway/events/Close.ts b/src/gateway/events/Close.ts
index 6b069d0b..296ab5ee 100644
--- a/src/gateway/events/Close.ts
+++ b/src/gateway/events/Close.ts
@@ -26,7 +26,7 @@ import {
 	User,
 } from "@fosscord/util";
 
-export async function Close(this: WebSocket, code: number, reason: string) {
+export async function Close(this: WebSocket, code: number, reason: Buffer) {
 	console.log("[WebSocket] closed", code, reason.toString());
 	if (this.heartbeatTimeout) clearTimeout(this.heartbeatTimeout);
 	if (this.readyTimeout) clearTimeout(this.readyTimeout);
diff --git a/src/gateway/events/Connection.ts b/src/gateway/events/Connection.ts
index 85ffb1ed..82081266 100644
--- a/src/gateway/events/Connection.ts
+++ b/src/gateway/events/Connection.ts
@@ -16,6 +16,7 @@
 	along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
+/* eslint-disable @typescript-eslint/ban-ts-comment */
 import WS from "ws";
 import { genSessionId, WebSocket } from "@fosscord/gateway";
 import { Send } from "../util/Send";
@@ -27,10 +28,12 @@ import { Message } from "./Message";
 import { Deflate, Inflate } from "fast-zlib";
 import { URL } from "url";
 import { Config } from "@fosscord/util";
-var erlpack: any;
+let erlpack: unknown;
 try {
 	erlpack = require("@yukikaze-bot/erlpack");
-} catch (error) {}
+} catch (error) {
+	/* empty */
+}
 
 // TODO: check rate limit
 // TODO: specify rate limit in config
diff --git a/src/gateway/events/Message.ts b/src/gateway/events/Message.ts
index 57899a23..b949f273 100644
--- a/src/gateway/events/Message.ts
+++ b/src/gateway/events/Message.ts
@@ -27,14 +27,16 @@ import path from "path";
 import fs from "fs/promises";
 const bigIntJson = BigIntJson({ storeAsString: true });
 
-var erlpack: any;
+let erlpack: { unpack: (buffer: Buffer) => Payload };
 try {
 	erlpack = require("@yukikaze-bot/erlpack");
-} catch (error) {}
+} catch (error) {
+	/* empty */
+}
 
 export async function Message(this: WebSocket, buffer: WS.Data) {
 	// TODO: compression
-	var data: Payload;
+	let data: Payload;
 
 	if (
 		(buffer instanceof Buffer && buffer[0] === 123) || // ASCII 123 = `{`. Bad check for JSON
@@ -44,9 +46,9 @@ export async function Message(this: WebSocket, buffer: WS.Data) {
 	} else if (this.encoding === "json" && buffer instanceof Buffer) {
 		if (this.inflate) {
 			try {
-				buffer = this.inflate.process(buffer) as any;
+				buffer = this.inflate.process(buffer);
 			} catch {
-				buffer = buffer.toString() as any;
+				buffer = buffer.toString();
 			}
 		}
 		data = bigIntJson.parse(buffer as string);
@@ -78,7 +80,6 @@ export async function Message(this: WebSocket, buffer: WS.Data) {
 
 	check.call(this, PayloadSchema, data);
 
-	// @ts-ignore
 	const OPCodeHandler = OPCodeHandlers[data.op];
 	if (!OPCodeHandler) {
 		console.error("[Gateway] Unkown opcode " + data.op);
@@ -100,7 +101,7 @@ export async function Message(this: WebSocket, buffer: WS.Data) {
 			: undefined;
 
 	try {
-		var ret = await OPCodeHandler.call(this, data);
+		const ret = await OPCodeHandler.call(this, data);
 		Sentry.withScope((scope) => {
 			scope.setSpan(transaction);
 			scope.setUser({ id: this.user_id });