refactor: strictly typed

src/parser/token.ts

@@ -1,15 +1,16 @@
 export default class Token {
-  type: string
+  type: string = 'notset'
   line: number
   col: number
   raw: string
   input: string
-  file: string
+  file?: string
   value: string
-  constructor (raw, col, input, file, line) {
+  constructor (raw: string, input: string, line: number, col: number, file?: string) {
     this.col = col
     this.line = line
     this.raw = raw
+    this.value = raw
     this.input = input
     this.file = file
   }