Remove supports-color

package.json

@@ -38,7 +38,6 @@
     "is-plain-obj": "^3.0.0",
     "jest-validate": "^26.6.2",
     "read-pkg-up": "^7.0.1",
-    "supports-color": "^8.1.0",
     "update-notifier": "^5.0.1",
     "yargs": "^16.2.0"
   },

src/print/colors.js

@@ -1,17 +1,38 @@
+import { stdout } from 'process'
+
 import Chalk from 'chalk'
-import { stdout as supportsColor } from 'supports-color'
 
+// Retrieve `chalk` instance.
+// Allows forcing `colors` with `true` or `false` (default: guessed).
+// Use `stdout.getColorDepth()` instead of chalk's default behavior (relying
+// on `supports-color`) because it behaves more correctly.
 export const getChalk = function (colors) {
   const level = getLevel(colors)
-  return new Chalk.Instance({ level })
+  const chalk = new Chalk.Instance({ level })
+  return chalk
 }
 
 const getLevel = function (colors) {
-  if (!colors) {
+  if (colors === false) {
+    return 0
+  }
+
+  const terminalLevel = getTerminalLevel()
+
+  if (colors === undefined) {
+    return terminalLevel
+  }
+
+  return Math.max(terminalLevel, 1)
+}
+
+const getTerminalLevel = function () {
+  if (!stdout.isTTY) {
     return 0
   }
 
-  return Math.max(supportsColor.level, 1)
+  return DEPTH_TO_LEVEL[stdout.getColorDepth()]
 }
 
-export const DEFAULT_COLORS = Boolean(supportsColor)
+// Maps chalk levels to color depth
+const DEPTH_TO_LEVEL = { 1: 0, 4: 1, 8: 2, 24: 3 }

src/print/options.js

@@ -4,8 +4,6 @@ import {
   EXAMPLE_OPTS as exampleParseOpts,
 } from '../parse/options.js'
 
-import { DEFAULT_COLORS } from './colors.js'
-
 // Normalize options and assign default values
 // Do not handle options already handled by abstract-parser
 export const getOpts = function (opts = {}) {
@@ -17,7 +15,6 @@ export const getOpts = function (opts = {}) {
 
 export const DEFAULT_OPTS = {
   ...defaultParseOpts,
-  colors: DEFAULT_COLORS,
 }
 
 export const EXAMPLE_OPTS = {