colors.ts

// https://github.com/debug-js/debug/blob/4.3.7/src/browser.js
const colors = [
  0x0000CC,
  0x0000FF,
  0x0033CC,
  0x0033FF,
  0x0066CC,
  0x0066FF,
  0x0099CC,
  0x0099FF,
  0x00CC00,
  0x00CC33,
  0x00CC66,
  0x00CC99,
  0x00CCCC,
  0x00CCFF,
  0x3300CC,
  0x3300FF,
  0x3333CC,
  0x3333FF,
  0x3366CC,
  0x3366FF,
  0x3399CC,
  0x3399FF,
  0x33CC00,
  0x33CC33,
  0x33CC66,
  0x33CC99,
  0x33CCCC,
  0x33CCFF,
  0x6600CC,
  0x6600FF,
  0x6633CC,
  0x6633FF,
  0x66CC00,
  0x66CC33,
  0x9900CC,
  0x9900FF,
  0x9933CC,
  0x9933FF,
  0x99CC00,
  0x99CC33,
  0xCC0000,
  0xCC0033,
  0xCC0066,
  0xCC0099,
  0xCC00CC,
  0xCC00FF,
  0xCC3300,
  0xCC3333,
  0xCC3366,
  0xCC3399,
  0xCC33CC,
  0xCC33FF,
  0xCC6600,
  0xCC6633,
  0xCC9900,
  0xCC9933,
  0xCCCC00,
  0xCCCC33,
  0xFF0000,
  0xFF0033,
  0xFF0066,
  0xFF0099,
  0xFF00CC,
  0xFF00FF,
  0xFF3300,
  0xFF3333,
  0xFF3366,
  0xFF3399,
  0xFF33CC,
  0xFF33FF,
  0xFF6600,
  0xFF6633,
  0xFF9900,
  0xFF9933,
  0xFFCC00,
  0xFFCC33,
];

// https://github.com/debug-js/debug/blob/4.3.4/src/common.js#L41
export function selectColor(ns: string) {
  let hash = 0;

  for (let i = 0; i < ns.length; i++) {
    hash = ((hash << 5) - hash) + ns.charCodeAt(i);
    hash |= 0; // Convert to 32bit integer
  }

  return colors[Math.abs(hash) % colors.length];
}

export const colorNamespace = (ns: string) => {
  const color = selectColor(ns);
  const r = color >> 16;
  const g = color >> 8 & 0xFF;
  const b = color & 0xFF;
  return `\x1b[38;2;${r};${g};${b}m${ns}\x1b[1;0m`;
};