refactor

Resolve #8467

packages/backend/src/misc/cafy-id.ts

@@ -1,33 +0,0 @@
-import { Context } from 'cafy';
-
-// eslint-disable-next-line @typescript-eslint/ban-types
-export class ID<Maybe = string> extends Context<string | (Maybe extends {} ? string : Maybe)> {
-	public readonly name = 'ID';
-
-	constructor(optional = false, nullable = false) {
-		super(optional, nullable);
-
-		this.push((v: any) => {
-			if (typeof v !== 'string') {
-				return new Error('must-be-an-id');
-			}
-			return true;
-		});
-	}
-
-	public getType() {
-		return super.getType('String');
-	}
-
-	public makeOptional(): ID<undefined> {
-		return new ID(true, false);
-	}
-
-	public makeNullable(): ID<null> {
-		return new ID(false, true);
-	}
-
-	public makeOptionalNullable(): ID<undefined | null> {
-		return new ID(true, true);
-	}
-}