Import Cost Fast

Import Cost Fast — coc.nvim

See the bundle size of every import in Vim/Neovim.

Display import sizes as virtual text using coc.nvim. Powered by esbuild and es-module-lexer.

Requirements

• coc.nvim installed and configured
• Code lens enabled in coc config

Installation

:CocInstall coc-import-cost-fast

Enable code lens (:CocConfig):

{
  "codeLens.enable": true
}

Features

• Inline size display — minified, gzipped, and brotli sizes shown as virtual text
• All import patterns — import, import *, import { }, require(), dynamic import()
• Language support — JavaScript, TypeScript, Vue, and Svelte
• Cached results — sizes cached per package + version for instant display
• Tree-shake awareness — reports if a package supports tree-shaking
• Brotli compression — shows brotli alongside gzip
• Budget warnings — ⚠ over budget! when imports exceed configured budgetKB
• Lighter alternatives — suggests smaller replacements (moment → dayjs, lodash → lodash-es)
• Estimated sizes — ~ prefix when bundling falls back to entry file size

Credits

Forked from wix/import-cost, rewritten in TypeScript with esbuild and es-module-lexer.

License

MIT