refactor(tools): replace @colors/colors with smaller and faster ansis

[webdiscus]

This PR replaces @colors/colors used in CLI tools with smaller and faster ansis.

Benefits of ansis

• The unpacked size is smaller: @colors/colors - 41.5 kB, ansis - 7 kB, see Compare the size of packages
• 10x faster than @colors/colors, see Benchmarks
• Supports Truecolor with fallback: TrueColor → 256 colors → 16 colors → no colors
• Doesn't extend String.prototype
• Zero dependencies
• Test coverage 100%

Packages that already use ansis

facebook/stylex, nestjs/nest, sequelize/core, oclif/core, salesforcecli/cli and thousands others

Changes

The changes in CLI tools:

• replace @colors/colors with ansis
• add color preview for selectors used in CSS
• fix ESLint errors in tools code

Checklist

• [ ] Added markup tests, or they don't apply here because...
• [ ] Updated the changelog at CHANGES.md

Test

This PR does not require unit/integration tests, but you can do the manual test.

Clone and install the forked repository:

git clone https://github.com/webdiscus/ansis-highlight.js.git
cd ansis-highlight.js
git checkout switch-to-ansis
npm i
npm run build

1) Run CheckTheme tools in CLI

For example, we want to check the vs2015 style:

node ./tools/checkTheme.js ./src/styles/vs2015.css

In console output will be displayed color text and NEW added preview of colors used in CSS selectors:

2) Run CheckAutoDetect tools in CLI

node ./tools/checkAutoDetect.js

In console output will be displayed color text: