BF interpreter with mismatched bracket removal.js

let bf = (code, input = '') => {
  	code = [...code];
  	let start_indices = [];
  	for (let i = 0; i < code.length; i++) {
    	if (code[i] == '[') start_indices.push(i);
    	if (code[i] == ']') start_indices.pop();
  	}
  	code = code.filter((char, i) => !start_indices.includes(i))
  
  	var tape = [0], tapeIndex = 0, tapeLimit = Infinity, cellLimit = 256, output = '';
    input = [...input];
    let codeTable = {
        '+': 'tape[tapeIndex] = (tape[tapeIndex] + 1) % cellLimit',
        '-': 'tape[tapeIndex] = tape[tapeIndex] ? tape[tapeIndex] - 1 : cellLimit - 1',
        '>': 'tapeIndex = (tapeIndex + 1) % tapeLimit',
        '<': 'tapeIndex = tapeIndex ? tapeIndex - 1 : Number.isFinite(tapeLimit) ? tapeLimit - 1 : tape.unshift(0) && 0',
        '[': 'while(tape[tapeIndex]){',
        ']': '}',
        '.': 'output += String.fromCharCode(tape[tapeIndex])',
        ',': 'tape[tapeIndex] = input.shift().charCodeAt()',
    }
    let transpiled = '';
    for(let char of code){
        if(char in codeTable){
            transpiled += codeTable[char] + '\n'
        }
    }
    eval(transpiled);
  	return output;
}