refactor(cli): categorize built-in themes into dark/ and light/ directories (#18634)

packages/cli/src/ui/themes/builtin/light/github-light.ts

@@ -0,0 +1,150 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { type ColorsTheme, Theme } from '../../theme.js';
+import { interpolateColor } from '../../color-utils.js';
+
+const githubLightColors: ColorsTheme = {
+  type: 'light',
+  Background: '#f8f8f8',
+  Foreground: '#24292E',
+  LightBlue: '#0086b3',
+  AccentBlue: '#458',
+  AccentPurple: '#900',
+  AccentCyan: '#009926',
+  AccentGreen: '#008080',
+  AccentYellow: '#990073',
+  AccentRed: '#d14',
+  DiffAdded: '#C6EAD8',
+  DiffRemoved: '#FFCCCC',
+  Comment: '#998',
+  Gray: '#999',
+  DarkGray: interpolateColor('#999', '#f8f8f8', 0.5),
+  FocusColor: '#458', // AccentBlue for GitHub branding
+  GradientColors: ['#458', '#008080'],
+};
+
+export const GitHubLight: Theme = new Theme(
+  'GitHub Light',
+  'light',
+  {
+    hljs: {
+      display: 'block',
+      overflowX: 'auto',
+      padding: '0.5em',
+      color: githubLightColors.Foreground,
+      background: githubLightColors.Background,
+    },
+    'hljs-comment': {
+      color: githubLightColors.Comment,
+      fontStyle: 'italic',
+    },
+    'hljs-quote': {
+      color: githubLightColors.Comment,
+      fontStyle: 'italic',
+    },
+    'hljs-keyword': {
+      color: githubLightColors.Foreground,
+      fontWeight: 'bold',
+    },
+    'hljs-selector-tag': {
+      color: githubLightColors.Foreground,
+      fontWeight: 'bold',
+    },
+    'hljs-subst': {
+      color: githubLightColors.Foreground,
+      fontWeight: 'normal',
+    },
+    'hljs-number': {
+      color: githubLightColors.AccentGreen,
+    },
+    'hljs-literal': {
+      color: githubLightColors.AccentGreen,
+    },
+    'hljs-variable': {
+      color: githubLightColors.AccentGreen,
+    },
+    'hljs-template-variable': {
+      color: githubLightColors.AccentGreen,
+    },
+    'hljs-tag .hljs-attr': {
+      color: githubLightColors.AccentGreen,
+    },
+    'hljs-string': {
+      color: githubLightColors.AccentRed,
+    },
+    'hljs-doctag': {
+      color: githubLightColors.AccentRed,
+    },
+    'hljs-title': {
+      color: githubLightColors.AccentPurple,
+      fontWeight: 'bold',
+    },
+    'hljs-section': {
+      color: githubLightColors.AccentPurple,
+      fontWeight: 'bold',
+    },
+    'hljs-selector-id': {
+      color: githubLightColors.AccentPurple,
+      fontWeight: 'bold',
+    },
+    'hljs-type': {
+      color: githubLightColors.AccentBlue,
+      fontWeight: 'bold',
+    },
+    'hljs-class .hljs-title': {
+      color: githubLightColors.AccentBlue,
+      fontWeight: 'bold',
+    },
+    'hljs-tag': {
+      color: githubLightColors.AccentBlue,
+      fontWeight: 'normal',
+    },
+    'hljs-name': {
+      color: githubLightColors.AccentBlue,
+      fontWeight: 'normal',
+    },
+    'hljs-attribute': {
+      color: githubLightColors.AccentBlue,
+      fontWeight: 'normal',
+    },
+    'hljs-regexp': {
+      color: githubLightColors.AccentCyan,
+    },
+    'hljs-link': {
+      color: githubLightColors.AccentCyan,
+    },
+    'hljs-symbol': {
+      color: githubLightColors.AccentYellow,
+    },
+    'hljs-bullet': {
+      color: githubLightColors.AccentYellow,
+    },
+    'hljs-built_in': {
+      color: githubLightColors.LightBlue,
+    },
+    'hljs-builtin-name': {
+      color: githubLightColors.LightBlue,
+    },
+    'hljs-meta': {
+      color: githubLightColors.Gray,
+      fontWeight: 'bold',
+    },
+    'hljs-deletion': {
+      background: '#fdd',
+    },
+    'hljs-addition': {
+      background: '#dfd',
+    },
+    'hljs-emphasis': {
+      fontStyle: 'italic',
+    },
+    'hljs-strong': {
+      fontWeight: 'bold',
+    },
+  },
+  githubLightColors,
+);