@thermal-print/core

Core type definitions for thermal printer libraries.

📦 Installation

pnpm add @thermal-print/core

🎯 Purpose

This package defines the universal intermediate representation (IR) for thermal printing. The PrintNode type is the bridge between renderers (React, Vue, etc.) and printer formats (ESC/POS, Star, ZPL, etc.).

📖 Exports

PrintNode

The core data structure representing a thermal printer document.

interface PrintNode {
  type: string; // 'document', 'page', 'view', 'text', 'image'
  props: any; // Component props
  children: PrintNode[]; // Child nodes
  style?: any; // Styling information
}

StandardElementType

Enum of standard element types.

enum StandardElementType {
  DOCUMENT = "document",
  PAGE = "page",
  VIEW = "view",
  TEXT = "text",
  IMAGE = "image",
  TEXTNODE = "textnode",
}

TextStyle

Text styling properties.

interface TextStyle {
  fontSize?: number;
  fontWeight?: string | number;
  fontFamily?: string;
  textAlign?: "left" | "center" | "right";
}

ViewStyle

Layout and container styling properties.

interface ViewStyle {
  flexDirection?: "row" | "column";
  justifyContent?: string;
  alignItems?: string;
  padding?: number;
  paddingTop?: number;
  paddingBottom?: number;
  margin?: number;
  marginTop?: number;
  marginBottom?: number;
  borderTop?: string;
  borderBottom?: string;
  width?: string | number;
}

🔧 Usage

This package is typically used indirectly through higher-level packages like @thermal-print/react or @thermal-print/escpos.

Direct Usage

import { PrintNode } from "@thermal-print/core";

const printNode: PrintNode = {
  type: "document",
  props: {},
  children: [
    {
      type: "text",
      props: { children: "Hello World" },
      children: [],
      style: { textAlign: "center", fontSize: 20 },
    },
  ],
  style: {},
};

📄 License

MIT © Gabriel Martinusso