Merge branch 'dev' into next

src/utils/format/unit.ts

@@ -9,3 +9,35 @@ export function addUnit(value?: string | number): string | undefined {
   value = String(value);
   return isNumeric(value) ? `${value}px` : value;
 }
+
+// cache
+let rootFontSize: number;
+
+function getRootFontSize() {
+  if (!rootFontSize) {
+    const doc = document.documentElement;
+    const fontSize =
+      doc.style.fontSize || window.getComputedStyle(doc).fontSize;
+
+    rootFontSize = parseFloat(fontSize);
+  }
+
+  return rootFontSize;
+}
+
+function convertRem(value: string) {
+  value = value.replace(/rem/g, '');
+  return +value * getRootFontSize();
+}
+
+export function unitToPx(value: string | number): number {
+  if (typeof value === 'number') {
+    return value;
+  }
+
+  if (value.indexOf('rem') !== -1) {
+    return convertRem(value);
+  }
+
+  return parseFloat(value);
+}