All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

• Interactive browser playground (playground/) with live evaluation, a searchable function menu, and support for units, fractions, big numbers, and matrices.
• GitHub Actions workflow to build and deploy the playground to GitHub Pages.
• TypeScript declaration generation (npm run build:types) with dedicated tsconfig.types.json output to dist/index.d.ts.
• Standalone test runner (tools/test.js) that discovers and runs every test file, plus DOM test helpers and playground unit/DOM test suites.
• npm run typecheck script for validating TypeScript declarations.
• GitHub Sponsors funding configuration.

• Migrated the build pipeline from Rollup to Guchho.
• Updated package entry points for CommonJS, ESM, browser, and type declarations.
• Test command now rebuilds the bundles before running the full test suite.
• Updated README and CONTRIBUTING for the new build and playground workflow.
• Requires Node.js 18 or newer.

• Legacy examples/react and examples/vanilla-js projects, superseded by the playground.
• Rollup configuration and Rollup-based build dependencies.
• Standalone ESLint, Prettier, and EditorConfig configurations in favor of the Guchho-based workflow.

• Improved test reliability with dedicated DOM helpers and cross-platform script handling.

• Version bump and repository housekeeping.
• Restricted example projects from being published with the package.

• Physical Quantity Arithmetic — Cross-type multiplication and division now produce correct derived units: length × length → area, area × length → volume, voltage × current → power, energy ÷ time → power, power × time → energy, voltage ÷ resistance → current, current × resistance → voltage, force ÷ area → pressure, and pressure × area → force.
• Temperature conversion — °F ↔ °C ↔ K now uses proper offset formulas via a Kelvin intermediary (98.6 F to C → "37 C").
• React example — New examples/react/ directory with a Vite-powered unit converter app (12 quick-convert presets).
• Derived unit results support to conversions (5 m * 3 m to cm2 → "150000 cm2").

• Renamed src/utils/globalUnits.js to src/utils/units.js.

• Unit tokenizer is no longer case-sensitive for uppercase unit keys (V, A, F, C, K, Hz, W, and others).
• Unit name disambiguation resolves duplicate names (F: farad/Fahrenheit, rad: angle/radiation, S/s: siemens/second) using the context of the paired unit (1 F to mF → farad, 98.6 F to C → Fahrenheit).

• React calculator example and updated documentation.

• Expanded class reference documentation and function documentation.

• Documentation and README updates.

• Arbitrary-precision arithmetic with BigNumber.
• Exact fractions with conversion and arithmetic support.
• Lambda expressions with x -> x^2 syntax.
• Range and spread operators, plus compound assignment.
• Degree-mode trigonometric functions (sind, cosd, tand, and inverses).
• Fluent expression chaining via expr.chain() and ans.
• State serialization with exportState() / importState().
• Command-line interface (bin/cli.mjs).
• ESLint (v10 flat config), Prettier formatting, and TypeScript JSDoc type checking.
• Husky pre-commit hook with lint-staged.
• Dependabot configuration and CodeQL security analysis.
• Bundle size monitoring and Jest coverage reporting.
• Node.js 24 in the CI test matrix.
• .editorconfig and // @ts-check annotations across the source files.
• engines field requiring Node.js 18 or newer.

• Upgraded Rollup from v2 to v4.
• Replaced rimraf with fs.rmSync and nodemon with Node's built-in --watch.
• CI now runs lint, typecheck, size checks, and coverage in addition to tests.

• Resolved all ESLint and TypeScript type errors.
• Fixed the lint-staged Windows ENOENT error.

• Unused Babel, rollup-plugin-strip-banner, glob, and rimraf dependencies.
• Redundant overrides and nodemon devDependencies.

• Unit conversion support.
• Matrix creation and linear algebra helpers, including determinant, inverse, transpose, LUP, QR, and polynomial roots.
• Complex number arithmetic and formatting.
• Symbolic math utilities such as simplify, derivative, and rationalize.
• Calculus and statistics functions.
• Parse and AST utility APIs.

• Maintenance and documentation updates.

• Maintenance and documentation updates.

• Corrected the import path in src/index.js to match the actual filename casing of src/core/Exprify.js.
• Fixed a cross-platform build issue where Rollup failed on Linux-based CI environments due to case-sensitive path resolution.

• Initial release of Exprify.
• Math expression parser and evaluator with arithmetic and parentheses support.
• Persistent variables and user-defined functions.
• Inline function definitions.
• Expression parsing and compilation APIs.
• CommonJS, ESM, browser, and minified bundles.