init

node_modules/qrcode/lib/browser.js

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+
+const canPromise = require('./can-promise')
+
+const QRCode = require('./core/qrcode')
+const CanvasRenderer = require('./renderer/canvas')
+const SvgRenderer = require('./renderer/svg-tag.js')
+
+function renderCanvas (renderFunc, canvas, text, opts, cb) {
+  const args = [].slice.call(arguments, 1)
+  const argsNum = args.length
+  const isLastArgCb = typeof args[argsNum - 1] === 'function'
+
+  if (!isLastArgCb && !canPromise()) {
+    throw new Error('Callback required as last argument')
+  }
+
+  if (isLastArgCb) {
+    if (argsNum < 2) {
+      throw new Error('Too few arguments provided')
+    }
+
+    if (argsNum === 2) {
+      cb = text
+      text = canvas
+      canvas = opts = undefined
+    } else if (argsNum === 3) {
+      if (canvas.getContext && typeof cb === 'undefined') {
+        cb = opts
+        opts = undefined
+      } else {
+        cb = opts
+        opts = text
+        text = canvas
+        canvas = undefined
+      }
+    }
+  } else {
+    if (argsNum < 1) {
+      throw new Error('Too few arguments provided')
+    }
+
+    if (argsNum === 1) {
+      text = canvas
+      canvas = opts = undefined
+    } else if (argsNum === 2 && !canvas.getContext) {
+      opts = text
+      text = canvas
+      canvas = undefined
+    }
+
+    return new Promise(function (resolve, reject) {
+      try {
+        const data = QRCode.create(text, opts)
+        resolve(renderFunc(data, canvas, opts))
+      } catch (e) {
+        reject(e)
+      }
+    })
+  }
+
+  try {
+    const data = QRCode.create(text, opts)
+    cb(null, renderFunc(data, canvas, opts))
+  } catch (e) {
+    cb(e)
+  }
+}
+
+exports.create = QRCode.create
+exports.toCanvas = renderCanvas.bind(null, CanvasRenderer.render)
+exports.toDataURL = renderCanvas.bind(null, CanvasRenderer.renderToDataURL)
+
+// only svg for now.
+exports.toString = renderCanvas.bind(null, function (data, _, opts) {
+  return SvgRenderer.render(data, opts)
+})