fix(types): provide TypeScript type for Grammar

Author: char0n

types/index.d.ts

@@ -20,6 +20,31 @@ interface SubstituteOptions {
   encoder: (serverVariableValue: string, serverVariableName?: string) => string;
 }
 
+export interface Grammar {
+  grammarObject: string; // Internal identifier
+  rules: Rule[]; // List of grammar rules
+  udts: UDT[]; // User-defined terminals (empty in this grammar)
+  toString(): string; // Method to return the grammar in ABNF format
+}
+
+export interface Rule {
+  name: string; // Rule name
+  lower: string; // Lowercased rule name
+  index: number; // Rule index
+  isBkr: boolean; // Is this a back-reference?
+  opcodes?: Opcode[]; // List of opcodes for the rule
+}
+
+export type Opcode =
+  | { type: 1; children: number[] } // ALT (alternation)
+  | { type: 2; children: number[] } // CAT (concatenation)
+  | { type: 3; min: number; max: number } // REP (repetition)
+  | { type: 4; index: number } // RNM (rule reference)
+  | { type: 5; min: number; max: number } // TRG (terminal range)
+  | { type: 6 | 7; string: number[] }; // TBS or TLS (byte sequence or literal string)
+
+export type UDT = {}; // User-defined terminals (empty in this grammar)
+
 export function parse(serverURLTemplate: string): ParseResult;
 export function test(serverURLTemplate: string, options?: TestOptions): boolean;
 export function substitute(
@@ -28,3 +53,4 @@ export function substitute(
   options?: SubstituteOptions,
 ): string;
 export function encodeServerVariable(serverVariableValue: string): string;
+export function Grammar(): Grammar;