refactor(v2): import lqip-loader, fix build on Node 13 (#2544)

packages/lqip-loader/src/utils.js

@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const sortBy = require('lodash.sortby');
+
+/**
+ * toBase64
+ * @description it returns a Base64 image string with required formatting
+ * to work on the web (<img src=".." /> or in CSS url('..'))
+ *
+ * @param extension: image file extension
+ * @param data: base64 string
+ * @returns {string}
+ */
+const toBase64 = (extMimeType, data) => {
+  return `data:${extMimeType};base64,${data.toString('base64')}`;
+};
+
+/**
+ * toPalette
+ * @description takes a color swatch object, converts it to an array & returns
+ * only hex color
+ *
+ * @param swatch
+ * @returns {{palette: Array}}
+ */
+const toPalette = (swatch) => {
+  let palette = Object.keys(swatch).reduce((result, key) => {
+    if (swatch[key] !== null) {
+      result.push({
+        popularity: swatch[key].getPopulation(),
+        hex: swatch[key].getHex(),
+      });
+    }
+    return result;
+  }, []);
+  palette = sortBy(palette, ['popularity']);
+  palette = palette.map((color) => color.hex).reverse();
+  return palette;
+};
+
+module.exports = {
+  toBase64,
+  toPalette,
+};