flow like the river

VISUALIZACION/node_modules/polished/lib/internalHelpers/_pxto.js.flow

@@ -0,0 +1,41 @@
+// @flow
+import endsWith from './_endsWith'
+import stripUnit from '../helpers/stripUnit'
+import PolishedError from './_errors'
+
+/**
+ * Factory function that creates pixel-to-x converters
+ * @private
+ */
+const pxtoFactory = (to: string) => (
+  pxval: string | number,
+  base?: string | number = '16px',
+): string => {
+  let newPxval = pxval
+  let newBase = base
+  if (typeof pxval === 'string') {
+    if (!endsWith(pxval, 'px')) {
+      throw new PolishedError(69, to, pxval)
+    }
+    newPxval = stripUnit(pxval)
+  }
+
+  if (typeof base === 'string') {
+    if (!endsWith(base, 'px')) {
+      throw new PolishedError(70, to, base)
+    }
+    newBase = stripUnit(base)
+  }
+
+  if (typeof newPxval === 'string') {
+    throw new PolishedError(71, pxval, to)
+  }
+
+  if (typeof newBase === 'string') {
+    throw new PolishedError(72, base, to)
+  }
+
+  return `${newPxval / newBase}${to}`
+}
+
+export default pxtoFactory