@efx/chart-core

Framework-agnostic core types, utilities, and templates for ECharts-based multi-chart dashboards.

Installation

npm install @efx/chart-core
# or
pnpm add @efx/chart-core

Peer Dependencies

• echarts ^5.0.0 || ^6.0.0

Overview

This package provides the foundation for the EfxChart system - a declarative approach to building multi-chart ECharts dashboards using ASCII-based layout templates. It contains:

• Types: Full TypeScript definitions for ECharts options and chart configuration
• Templates: Pre-defined ASCII layout templates for common dashboard patterns
• Utilities: Template parsing, option building, and data generation helpers

Templates

ASCII-based layout templates define how charts are positioned:

import { FINANCE_LAYOUT, EFX_CHART_TEMPLATES } from '@efx/chart-core'

// FINANCE_LAYOUT structure:
{
  name: 'finance',
  sections: ['header', 'sidebar', 'main', 'footer'],
  mobile: `
    | header  |
    | sidebar |
    | main    |
    | footer  |
  `,
  desktop: `
    | header  | header  | header  | header  |
    | sidebar | main    | main    | main    |
    | sidebar | footer  | footer  | footer  |
  `,
}

Available Templates

import {
  FINANCE_LAYOUT,      // Header + sidebar + main + footer
  DASHBOARD_LAYOUT,    // Standard dashboard
  COMPARISON_LAYOUT,   // Side-by-side comparison
  GRID_2X2_LAYOUT,     // 4 equal quadrants
  ANALYTICS_LAYOUT,    // KPIs + main + sidebar
  MONITORING_LAYOUT,   // 3x2 chart grid
  EFX_CHART_TEMPLATES, // All templates as object
} from '@efx/chart-core'

Types

EfxLayoutTemplate

interface EfxLayoutTemplate {
  name: string
  sections: readonly string[]  // Section IDs
  mobile: string               // ASCII template for mobile
  desktop: string              // ASCII template for desktop
  tablet?: string              // Optional tablet layout
}

EfxChartSectionConfig

Configuration for a chart section:

interface EfxChartSectionConfig {
  section: string              // Section ID from template
  title?: string | TitleConfig
  type?: 'line' | 'bar' | 'pie' | 'scatter' | 'area' | 'candlestick'
  data?: unknown[]
  xAxis?: AxisConfig
  yAxis?: AxisConfig
  series?: SeriesConfig
  padding?: number | string | PaddingConfig
  // ... full ECharts options exposure
}

Type Helpers

import type { ExtractSections, SectionId } from '@efx/chart-core'

// Extract section names as union type
type FinanceSections = ExtractSections<typeof FINANCE_LAYOUT>
// => 'header' | 'sidebar' | 'main' | 'footer'

Utilities

Template Parsing

import { parseLayoutTemplate, parseTemplateToLayout } from '@efx/chart-core'

// Parse full template for all breakpoints
const layouts = parseLayoutTemplate(FINANCE_LAYOUT)
// => { mobile: ParsedLayout, desktop: ParsedLayout }

// Parse single ASCII template
const parsed = parseTemplateToLayout(template.desktop)
// => { columns: 4, rows: 3, sectionCoordMap: { header: [[0,3], [0,0]], ... } }

Option Building

import { buildEChartsOption, buildMediaDefinitions } from '@efx/chart-core'

// Build ECharts option from section configs
const option = buildEChartsOption(sections, sectionCoordMap, columns, rows)

// Build responsive media queries
const media = buildMediaDefinitions(mobileLayout, desktopLayout, sections)

Data Generators

Sample data generators for demos and testing:

import {
  generateTimeSeriesData,
  generateCategoryData,
  generateScatterData,
  generatePieData,
  generateMultiSeriesData,
  generateCandlestickData,
} from '@efx/chart-core'

const timeSeries = generateTimeSeriesData(30)    // 30 days of data
const categories = generateCategoryData(5)       // 5 categories
const scatter = generateScatterData(100)         // 100 points

Padding Utilities

import { parsePadding, paddingToGridPosition } from '@efx/chart-core'

// Parse flexible padding formats
parsePadding(10)           // { top: 10, right: 10, bottom: 10, left: 10 }
parsePadding('20,10')      // { top: 10, right: 20, bottom: 10, left: 20 }
parsePadding('10,20,30,40') // { top: 10, right: 20, bottom: 30, left: 40 }

Related Packages

• @efx/chart-react - React components for EfxChart

License

MIT