expo-escpos
Version:
A comprehensive Expo module for ESC/POS thermal printer integration. Supports text formatting, image printing, and receipt generation for 58mm and 80mm thermal printers. Features include text alignment, font styling (bold, italic, underline), image render
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JavaScript
/**
* Expo ESC/POS - Convert HTML to ESC/POS commands for thermal printers.
*
* Main features:
* - Convert HTML (with QR/barcode tags) to ESC/POS commands for image printing
* - Supports Vietnamese and other complex characters by rendering as images
* - Supports both 58mm and 80mm printer models
*
* @module expo-escpos
*
* @section Custom HTML Tag Attributes
*
* To print QR codes and barcodes, add special attributes to your HTML tags:
*
* **QR Code Tag Example:**
* <div
* data-type="qrcode"
* data-text="https://example.com" // (required) The text or URL to encode
* data-size="150" // (optional) Size in pixels (default: 150)
* data-error-correction="M" // (optional) Error correction: "L", "M", "Q", "H" (default: "M")
* ></div>
*
* **Barcode Tag Example:**
* <div
* data-type="barcode"
* data-text="123456789" // (required) The text to encode
* data-width="200" // (optional) Width in pixels (default: 200)
* data-height="80" // (optional) Height in pixels (default: width/2)
* ></div>
*
* **Attribute Reference:**
* - `data-type` (required): "qrcode" or "barcode". Tells the renderer what to generate.
* - `data-text` (required): The content to encode in the QR code or barcode. If omitted, uses the element's text content.
* - `data-size` (QR only, optional): Size of the QR code in pixels. Default: 150.
* - `data-error-correction` (QR only, optional): Error correction level for QR code. "L", "M", "Q", or "H". Default: "M".
* - `data-width` (Barcode only, optional): Width of the barcode in pixels. Default: 200.
* - `data-height` (Barcode only, optional): Height of the barcode in pixels. Default: width/2.
*
* @example
* // Print a QR code:
* const html = `
* <div data-type="qrcode" data-text="https://example.com" data-size="150"></div>
* `;
* const data = await renderHtmlToImages(html, { model: "80" });
* // Send 'data' to your printer
*
* // Print a barcode:
* const html2 = `
* <div data-type="barcode" data-text="123456789" data-width="200" data-height="80"></div>
* `;
* const data2 = await renderHtmlToImages(html2, { model: "80" });
* // Send 'data2' to your printer
*/
import { requireNativeModule } from "expo";
const ExpoEscpos = requireNativeModule("ExpoEscpos");
export const { renderImages, renderHtmlToImages } = ExpoEscpos;
export default ExpoEscpos;
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