Brainfuck in ts

BF.ts

class Bf {
    element: HTMLElement;
    exec(script: string, input: string, inputPos = [0], pos = 0, data: number[] = [], ptr = [0]) {
        while (script.length > pos) {
            switch (script[pos]) {
                case '+': data[ptr[0]] = ((data[ptr[0]] | 0) + 1) % 256;
                    break;
                case '-': data[ptr[0]] = ((data[ptr[0]] | 0) - 1) % 256;
                    break;
                case '<': ptr[0]--;
                    break;
                case '>': ptr[0]++;
                    break;
                case '.':
                    this.element.innerText += String.fromCharCode(data[ptr[0]]);
                    break;
                case ',':
                    if (inputPos[0] >= input.length) throw "input:";
                    data[ptr[0]] = input.charCodeAt(inputPos[0]);
                    inputPos[0]++;
                    break;
                case '[':
                    var p = pos + 1;
                    if (data[ptr[0]]) {
                        while (data[ptr[0]]) {
                            pos = this.exec(script, input, inputPos, p, data, ptr);
                        }
                    }
                    else {
                        var cc = 1;
                        while (cc > 0) {
                            pos++;
                            if (script[pos] == '[') cc++;
                            else if (script[pos] == ']') cc--;
                        }
                    }
                    break;
                case ']': return pos;
                    break;
            }
            pos++;
        }
    }
}