Function detectColorMode

src/native-ts/color-diff/index.ts:95–99

(theme: string)

const DEFAULT_BG: Color = { r: 0, g: 0, b: 0, a: 1 }

function detectColorMode(theme: string): ColorMode {
  if (theme.includes('ansi')) return 'ansi'
  const ct = process.env.COLORTERM ?? ''
  return ct === 'truecolor' || ct === '24bit' ? 'truecolor' : 'color256'
}

// Port of ansi_colours::ansi256_from_rgb — approximates RGB to the xterm-256
// palette (6x6x6 cube + 24 greys). Picks the perceptually closest index by