fix empty file error

+ 1.0.10 version bump

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jitterbit-script",
-  "version": "1.0.9",
+  "version": "1.0.10",
   "description": "Static typechecker and interpreter for Jitterbit Script",
   "main": "build/index.js",
   "scripts": {

src/frontend/parser.ts

@@ -145,6 +145,14 @@ export default class Parser {
    * @throws `ParserError` (runtime-only)
    */
   private removeScopeTags(diagnostics?: Diagnostic[]): boolean {
+    // empty script
+    if(this.tokens.length === 0) {
+      if(diagnostics)
+        return true;
+      else
+        throw new ParserError("Empty script.");
+    }
+
     // find the evaluation scope - <trans>...</trans>
     let result = false;
     let openIdx: number | null = null;

tests/typechecker/errors.test.ts

@@ -270,4 +270,9 @@ msg = Case(
     // Expected expression before the end of script.
     expect(result.diagnostics[0].error).toStrictEqual(true);
   });
+
+  test('Empty file.', function() {
+    const result = typecheck("");
+    expect(result.diagnostics.length).toStrictEqual(0);
+  });
 });