Function decode has a Cognitive Complexity of 90 (exceeds 5 allowed). Consider refactoring.

Open

function decode(chip, opcode, keyboard, logger) {
  const a = (opcode >> 12) & 0xf;
  const b = (opcode >> 8) & 0xf;
  const c = (opcode >> 4) & 0xf;
  const d = opcode & 0xf;

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File chip8.js has 625 lines of code (exceeds 250 allowed). Consider refactoring.

Open

const cloneDeep = require("lodash/cloneDeep");
const values = require("lodash/values");
const range = require("lodash/range");

const consts = require("./consts");

Function decode has 193 lines of code (exceeds 25 allowed). Consider refactoring.

Open

function decode(chip, opcode, keyboard, logger) {
  const a = (opcode >> 12) & 0xf;
  const b = (opcode >> 8) & 0xf;
  const c = (opcode >> 4) & 0xf;
  const d = opcode & 0xf;

Function decode2 has 135 lines of code (exceeds 25 allowed). Consider refactoring.

Open

function decode2(chip, pc) {
  const opcode = fetch(chip, pc);
  const a = (opcode >> 12) & 0xf;
  const b = (opcode >> 8) & 0xf;
  const c = (opcode >> 4) & 0xf;

Function decode2 has a Cognitive Complexity of 29 (exceeds 5 allowed). Consider refactoring.

Open

function decode2(chip, pc) {
  const opcode = fetch(chip, pc);
  const a = (opcode >> 12) & 0xf;
  const b = (opcode >> 8) & 0xf;
  const c = (opcode >> 4) & 0xf;

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Function update has 51 lines of code (exceeds 25 allowed). Consider refactoring.

Open

function update(chip) {
  function formatDebugString(str, digits, val) {
    return `${str}: ${val
      .toString(16)
      .padStart(digits, "0")

Function exports has 46 lines of code (exceeds 25 allowed). Consider refactoring.

Open

module.exports = env => {
  const GHPAGES = env && env.GHPAGES;

  const plugins = [
    new webpack.DefinePlugin({

Function init has 34 lines of code (exceeds 25 allowed). Consider refactoring.

Open

function init() {
  canvas = document.querySelector("#emulator");
  romSelect = document.querySelector("select#rom-select");
  romSelect.onchange = e => loadRom(event.target.value);

Function drw has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

Open

function drw(chip8, x, y, byte) {
  let vf = 0;
  const xCoord = chip8.v[x];
  const yCoord = chip8.v[y];
  const i = chip8.i;

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Avoid too many return statements within this function.

Open

        return module.exports.ldVxDT(chip, x);

Avoid too many return statements within this function.

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        return module.exports.ldVxIndirectI(chip, x);

Avoid too many return statements within this function.

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        return "SNE Vx, Vy";

Avoid too many return statements within this function.

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        return "LD I, addr";

Avoid too many return statements within this function.

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        return "LD Vx, Vy";

Avoid too many return statements within this function.

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        return "ADD I, Vx";

Avoid too many return statements within this function.

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        return module.exports.sne(chip, vx, byte);

Avoid too many return statements within this function.

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        return "Fx29";

Avoid too many return statements within this function.

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        return "Fx65";

Avoid too many return statements within this function.

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        return module.exports.ldDTVx(chip, x);

Avoid too many return statements within this function.

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        return "LD Vx, byte";