flow like the river

VISUALIZACION/node_modules/polished/lib/easings/easeInOut.js.flow

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+// @flow
+import type { TimingFunction } from '../types/timingFunction'
+
+const functionsMap = {
+  back: 'cubic-bezier(0.680, -0.550, 0.265, 1.550)',
+  circ: 'cubic-bezier(0.785,  0.135, 0.150, 0.860)',
+  cubic: 'cubic-bezier(0.645,  0.045, 0.355, 1.000)',
+  expo: 'cubic-bezier(1.000,  0.000, 0.000, 1.000)',
+  quad: 'cubic-bezier(0.455,  0.030, 0.515, 0.955)',
+  quart: 'cubic-bezier(0.770,  0.000, 0.175, 1.000)',
+  quint: 'cubic-bezier(0.860,  0.000, 0.070, 1.000)',
+  sine: 'cubic-bezier(0.445,  0.050, 0.550, 0.950)',
+}
+
+/**
+ * String to represent common easing functions as demonstrated here: (github.com/jaukia/easie).
+ *
+ * @example
+ * // Styles as object usage
+ * const styles = {
+ *   'transitionTimingFunction': easeInOut('quad')
+ * }
+ *
+ * // styled-components usage
+ *  const div = styled.div`
+ *   transitionTimingFunction: ${easeInOut('quad')};
+ * `
+ *
+ * // CSS as JS Output
+ *
+ * 'div': {
+ *   'transitionTimingFunction': 'cubic-bezier(0.455,  0.030, 0.515, 0.955)',
+ * }
+ */
+export default function easeInOut(functionName: string): TimingFunction {
+  return functionsMap[functionName.toLowerCase().trim()]
+}