fix: type error

Author: Sway007

packages/shader-lab/src/ShaderLabUtils.ts

@@ -27,7 +27,7 @@ export class ShaderLabUtils {
     source: string,
     location: ShaderRange | ShaderPosition,
     file?: string
-  ): Error | void {
+  ): Error | undefined {
     // #if _VERBOSE
     return new GSError(errorName, message, location, source, file);
     // #else

packages/shader-lab/src/common/BaseScanner.ts

@@ -148,7 +148,7 @@ export default class BaseScanner {
   throwError(pos: ShaderPosition | ShaderRange, ...msgs: any[]) {
     const error = ShaderLabUtils.createGSError(msgs.join(" "), GSErrorName.ScannerError, this._source, pos);
     // #if _VERBOSE
-    Logger.error(error.toString());
+    Logger.error(error!.toString());
     // #endif
     throw error;
   }