Fix diagnostic codes

packages/lib/VDF/VDFErrors.ts

@@ -17,6 +17,7 @@ import type { VDFRange } from "./VDFRange"
  * ```
  */
 export abstract class VDFSyntaxError extends Error {
+	public abstract readonly name: string
 	public range: VDFRange
 	constructor(unexpected: string, expected: string[], range: VDFRange) {
 		super(`Unexpected ${unexpected}. Expected ${expected.join(" | ")}.`)
@@ -25,24 +26,28 @@ export abstract class VDFSyntaxError extends Error {
 }
 
 export class UnexpectedCharacterError extends VDFSyntaxError {
+	public readonly name = "UnexpectedCharacterError"
 	constructor(unexpected: string, expected: string[], range: VDFRange) {
 		super(unexpected, expected, range)
 	}
 }
 
 export class UnclosedEscapeSequenceError extends VDFSyntaxError {
+	public readonly name = "UnclosedEscapeSequenceError"
 	constructor(range: VDFRange) {
 		super("Unclosed escape sequence", ["char"], range)
 	}
 }
 
 export class EndOfStreamError extends VDFSyntaxError {
+	public readonly name = "EndOfStreamError"
 	constructor(expected: string[], range: VDFRange) {
 		super("EOF", expected, range)
 	}
 }
 
 export class UnexpectedTokenError extends VDFSyntaxError {
+	public readonly name = "UnexpectedTokenError"
 	constructor(unexpected: `'${string}'`, expected: string[], range: VDFRange) {
 		super(unexpected, expected, range)
 	}

packages/lib/server/LanguageServer.ts

@@ -163,7 +163,7 @@ export abstract class LanguageServer<T extends DocumentSymbol[]> {
 				{
 					range: diagnostics.range,
 					severity: DiagnosticSeverity.Error,
-					code: diagnostics.constructor.name,
+					code: diagnostics.name, // Don't use diagnostics.constructor.name because webpack obfuscates class names
 					source: this.languageId,
 					message: diagnostics.message
 				}