Fix reported issues and add template identifier generation logic

src/errors.ts

@@ -0,0 +1,15 @@
+/* eslint-disable max-classes-per-file */
+
+export class InvalidTemplateError extends Error {
+    constructor(errorMessage: string) {
+        const message = `Invalid template: ${errorMessage}`;
+        super(message);
+    }
+}
+
+export class FailedToParseTemplateError extends Error {
+    constructor(errorMessage: string) {
+        const message = `Failed to parse template: ${errorMessage}`;
+        super(message);
+    }
+}