Merge pull request #122 from Makanz/feature/3.0.2

Feature/3.0.2

Author: Makanz

.github/copilot-instructions.md

@@ -1,4 +1,4 @@
-# Chart.js Plugin Trendline — Copilot Instructions
+# Chart.js Plugin Trendline — Agent Instructions
 
 This plugin adds trendline support to Chart.js charts. It fits a linear regression model to datasets and draws trendlines over bar or line charts.
 

CLAUDE.md

@@ -0,0 +1,45 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a Chart.js plugin that adds linear trendline support to charts. It fits regression models to datasets and draws trendlines over bar, line, and scatter charts.
+
+## Development Commands
+
+- `pnpm run build` - Build the minified plugin using webpack
+- `pnpm test` - Run Jest tests for all components
+
+## Architecture
+
+The plugin follows a modular structure:
+
+- **Entry Point**: `src/index.js` - Auto-registers plugin globally and exports for manual registration
+- **Core**: `src/core/plugin.js` - Main plugin lifecycle integration with Chart.js hooks (`afterDatasetsDraw`, `beforeInit`)
+- **Components**: `src/components/` - Rendering logic for trendlines and labels
+- **Utilities**: `src/utils/` - Math calculations (`lineFitter.js`) and drawing helpers (`drawing.js`)
+
+## Key Implementation Details
+
+- Plugin integrates with Chart.js v4+ lifecycle using `afterDatasetsDraw` hook
+- Trendlines are drawn after datasets to appear on top
+- Dataset ordering is handled via `order` property (0-order datasets draw last)
+- Configuration is added to datasets via `trendlineLinear` property
+- Supports projection mode, custom styling, and labels with legends
+
+## Testing
+
+All components have corresponding `.test.js` files using Jest. Uses `jest-canvas-mock` for Canvas API mocking.
+
+## Coding Standards
+
+- Use modern JavaScript (ES6+)
+- 2-space indentation
+- JSDoc for public methods (Google style)
+- Descriptive naming without abbreviations
+- Ensure Chart.js v4+ compatibility
+
+## Chart Type Support
+
+Currently supports: bar, line, scatter charts

GEMINI.md

@@ -0,0 +1,40 @@
+# Chart.js Plugin Trendline — Agent Instructions
+
+This plugin adds trendline support to Chart.js charts. It fits a linear regression model to datasets and draws trendlines over bar or line charts.
+
+## Project Structure
+
+-   Root:
+    -   `package.json`, `webpack.config.js`, `example/*.html`
+-   Source (`src/`):
+    -   `index.js` — Entry point
+    -   `components/` — Rendering logic (`label.js`, `trendline.js`)
+    -   `core/` — Plugin definition (`plugin.js`)
+    -   `utils/` — Math and drawing helpers (`drawing.js`, `lineFitter.js`)
+
+## Coding Guidelines
+
+1. Use modern JavaScript (ES6+)
+2. Indent with 2 spaces
+3. Use JSDoc for public methods (Google style)
+4. Ensure compatibility with Chart.js v4+
+5. Name files/functions descriptively (no abbreviations)
+
+## File Notes
+
+-   `plugin.js`: Main plugin lifecycle integration
+-   `trendline.js`: Handles drawing trendlines
+-   `lineFitter.js`: Performs regression math
+-   `example/*.html`: Demo charts — manually verify after changes
+
+## Workflow Tips
+
+1. Changes to `plugin.js` should align with Chart.js plugin lifecycle (e.g., `afterDatasetsDraw`)
+2. If editing `trendline.js`, test with multiple chart types
+3. Validate rendering via example HTMLs after code updates
+4. Run linter and formatter before commit (see `.eslintrc.js` if present)
+
+## Restrictions
+
+-   Do not modify build config unless changing build behavior
+-   Do not auto-generate example files

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "chartjs-plugin-trendline",
-  "version": "3.0.1",
+  "version": "3.0.2",
   "description": "Trendline for Chart.js",
   "main": "src/index.js",
   "scripts": {