Microsoft Power BI visuals FormattingUtils

FormattingUtils is a set of functions and classes in order to format values for Power BI custom visuals

Usage

Learn how to install and use the FormattingUtils in your custom visuals:

• Usage Guide

Development

Common scripts:

Command	Description
npm ci	Install pinned dependencies from package-lock.json
npm run build	Compile src/ into lib/ with TypeScript declarations and source maps
npm test	Run the full Vitest suite once (used by CI)
npm run test:watch	Run Vitest in watch mode; re-runs affected tests on file change
npm run test:typecheck	Type-check the test/ tree with TypeScript using test/tsconfig.json
npm run lint	Lint the codebase with ESLint flat config in eslint.config.mjs
npm run lint:fix	Auto-fix lint issues where possible

TypeScript configs

• tsconfig.json builds src/ into lib/.
• test/tsconfig.json extends the main config, adds vitest/globals, and includes test/ files.

Tests

Tests live under test/ and run on Vitest in a real browser via Vitest browser mode (Playwright/Chromium). Running them locally the first time requires the browser binary: npx playwright install chromium.

Contributing

• Read our contribution guideline to find out how to contribute bugs fixes and improvements
• Issue Tracker
• Development workflow
• How to build
• How to run unit tests locally

License

See the LICENSE file for license rights and limitations (MIT).