ESLint: warn for deprecated constructs

src/api/util/utility/RandomInviteID.ts

@@ -49,7 +49,11 @@ export function snowflakeBasedInvite() {
         snowflake = snowflake / base;
     }
 
-    return str.substr(3, 8).split("").reverse().join("");
+    return str
+        .slice(3, 3 + 8)
+        .split("")
+        .reverse()
+        .join("");
 }
 
 export function randomUpperString(length: number = 10) {

src/util/util/Event.ts

@@ -204,8 +204,8 @@ class UnixSocketListener {
                 while (buffer.length >= 4) {
                     const msgLen = buffer.readUInt32BE(0);
                     if (buffer.length < 4 + msgLen) break;
-                    const msgBuf = buffer.slice(4, 4 + msgLen);
-                    buffer = buffer.slice(4 + msgLen);
+                    const msgBuf = buffer.subarray(4, 4 + msgLen);
+                    buffer = buffer.subarray(4 + msgLen);
                     try {
                         const payload = JSON.parse(msgBuf.toString());
                         this.eventEmitter.emit(payload.id, payload.event);