From dc925959887990de3b1d014f76a7950912196726 Mon Sep 17 00:00:00 2001
From: Ankit <bugwheels94@gmail.com>
Date: Mon, 5 Feb 2024 09:27:10 +0000
Subject: [PATCH] fix: types made optional

fix #84
---
 src/index.ts             | 3 +--
 src/lexer.ts             | 2 +-
 src/postfix_evaluator.ts | 2 +-
 3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index e166bbd..c3ecf32 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,7 +7,6 @@ import { createMathFunctions } from './functions'
 // var Mexp = function (parsed) {
 //   this.value = parsed
 // }
-
 class Mexp {
 	static TOKEN_TYPES = tokenTypes
 	static tokenTypes = tokenTypes
@@ -16,7 +15,7 @@ class Mexp {
 	addToken = addToken
 	lex = lex
 	postfixEval = postfixEval
-	eval(string: string, tokens: Token[], Constants: Constants) {
+	eval(string: string, tokens?: Token[], Constants?: Constants) {
 		return this.postfixEval(this.toPostfix(this.lex(string, tokens)), Constants)
 	}
 	math!: ReturnType<typeof createMathFunctions>
diff --git a/src/lexer.ts b/src/lexer.ts
index cd76ebe..521759e 100644
--- a/src/lexer.ts
+++ b/src/lexer.ts
@@ -195,7 +195,7 @@ function tokenize(mexp: Mexp, string: string) {
   }
   return nodes;
 }
-export const lex = function (this: Mexp, inp: string, tokens: Token[]) {
+export const lex = function (this: Mexp, inp: string, tokens?: Token[]) {
   "use strict";
   var changeSignObj: ParsedToken = {
     value: this.math.changeSign,
diff --git a/src/postfix_evaluator.ts b/src/postfix_evaluator.ts
index 65f06b1..11bcf55 100644
--- a/src/postfix_evaluator.ts
+++ b/src/postfix_evaluator.ts
@@ -1,7 +1,7 @@
 import { toPostfix } from './postfix'
 import { tokenTypes, ParsedToken } from './token'
 export type Constants = Record<string, number>
-export function postfixEval(arr: ReturnType<typeof toPostfix>, Constants: Constants) {
+export function postfixEval(arr: ReturnType<typeof toPostfix>, Constants?: Constants) {
 	Constants = Constants || {}
 	Constants.PI = Math.PI
 	Constants.E = Math.E