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node_modules/vant/es/uploader/utils.js

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+import { isFunction } from '../utils';
+export function toArray(item) {
+  if (Array.isArray(item)) {
+    return item;
+  }
+
+  return [item];
+}
+export function readFile(file, resultType) {
+  return new Promise(function (resolve) {
+    if (resultType === 'file') {
+      resolve(null);
+      return;
+    }
+
+    var reader = new FileReader();
+
+    reader.onload = function (event) {
+      resolve(event.target.result);
+    };
+
+    if (resultType === 'dataUrl') {
+      reader.readAsDataURL(file);
+    } else if (resultType === 'text') {
+      reader.readAsText(file);
+    }
+  });
+}
+export function isOversize(files, maxSize) {
+  return toArray(files).some(function (file) {
+    if (file) {
+      if (isFunction(maxSize)) {
+        return maxSize(file);
+      }
+
+      return file.size > maxSize;
+    }
+
+    return false;
+  });
+}
+var IMAGE_REGEXP = /\.(jpeg|jpg|gif|png|svg|webp|jfif|bmp|dpg)/i;
+export function isImageUrl(url) {
+  return IMAGE_REGEXP.test(url);
+}
+export function isImageFile(item) {
+  // some special urls cannot be recognized
+  // user can add `isImage` flag to mark it as an image url
+  if (item.isImage) {
+    return true;
+  }
+
+  if (item.file && item.file.type) {
+    return item.file.type.indexOf('image') === 0;
+  }
+
+  if (item.url) {
+    return isImageUrl(item.url);
+  }
+
+  if (item.content) {
+    return item.content.indexOf('data:image') === 0;
+  }
+
+  return false;
+}