remove some unused code

Author: Rich-Harris

src/index.ts

@@ -1,6 +1,5 @@
 const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$';
 const reserved = /^(?:do|if|in|for|int|let|new|try|var|byte|case|char|else|enum|goto|long|this|void|with|await|break|catch|class|const|final|float|short|super|throw|while|yield|delete|double|export|import|native|return|switch|throws|typeof|boolean|default|extends|finally|package|private|abstract|continue|debugger|function|volatile|interface|protected|transient|implements|instanceof|synchronized)$/;
-const unsafe = /[<>\/\u2028\u2029]/g;
 const escaped: Record<string, string> = {
 	'<': '\\u003C',
 	'>' : '\\u003E',
@@ -19,8 +18,6 @@ const objectProtoOwnPropertyNames = Object.getOwnPropertyNames(Object.prototype)
 export default function devalue(value: any) {
 	const counts = new Map();
 
-	let n = 0;
-
 	function walk(thing: any) {
 		if (typeof thing === 'function') {
 			throw new Error(`Cannot stringify a function`);
@@ -209,10 +206,6 @@ function isPrimitive(thing: any) {
 	return Object(thing) !== thing;
 }
 
-function escape(char: string) {
-	return escaped[char];
-}
-
 function stringifyPrimitive(thing: any) {
 	if (typeof thing === 'string') return stringifyString(thing);
 	if (thing === void 0) return 'void 0';