refactor hash-format and add Side enum

src/enums/side.ts

@@ -0,0 +1,17 @@
+export enum Side {
+  "Both" = "both",
+  "Client" = "client",
+  "Server" = "server",
+}
+
+export function isValidSide(side: string | undefined): Side {
+  if (side == undefined) {
+    return Side.Both;
+  }
+
+  if (Object.values(Side).includes(side.toLowerCase() as Side)) {
+    return side.toLowerCase() as Side;
+  } else {
+    throw new Error("Invalid side!");
+  }
+}

src/parser.ts

@@ -6,12 +6,13 @@ import {
   CurseForgeProvider,
   GitHubProvider,
 } from "./provider";
-import { HashFormat, isValidHashFormat } from "./hashFormat";
+import { HashFormat, isValidHashFormat } from "./enums/hash-format";
+import { isValidSide, type Side } from "./enums/side";
 
 export interface Metafile {
   name: string;
   filename: string;
-  side: "server" | "client" | "both" | undefined;
+  side: Side;
   provider: UrlProvider;
   option: Option;
 }
@@ -50,11 +51,12 @@ export class IndexFileEntry {
     }
     const fileContent = await this.file.fetchContents();
     const parsed = toml.parse(fileContent);
+    const side = isValidSide(parsed.side);
 
     const metafile: Metafile = {
       name: parsed.name,
       filename: parsed.filename,
-      side: parsed.side,
+      side: side,
       provider: this.parseProvider(parsed),
       option: {
         optional: parsed.option?.optional || false,
@@ -136,7 +138,7 @@ export async function parsePackwizIndex(
       (file: {
         file: string;
         hash: string;
-        hashFormat: HashFormats;
+        hashFormat: HashFormat;
         alias?: string;
         metafile?: boolean;
         preserve?: boolean;

src/provider.ts

@@ -1,5 +1,5 @@
 import Resource from "./resource";
-import { HashFormat } from "./hashFormat";
+import { HashFormat } from "./enums/hash-format";
 
 export class UrlProvider {
   constructor(