flow like the river

VISUALIZACION/node_modules/polished/lib/math/presets/exponentialSymbols.js.flow

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+// @flow
+
+function factorial(a: number): number {
+  if (a % 1 || !(+a >= 0)) return NaN
+  if (a > 170) return Infinity
+  else if (a === 0) return 1
+  else {
+    return a * factorial(a - 1)
+  }
+}
+
+function power(a: number, b: number): number {
+  return a ** b
+}
+
+function sqrt(a: number): number {
+  return Math.sqrt(a)
+}
+
+const exponentialSymbols = {
+  symbols: {
+    '!': {
+      postfix: {
+        symbol: '!',
+        f: factorial,
+        notation: 'postfix',
+        precedence: 6,
+        rightToLeft: 0,
+        argCount: 1,
+      },
+      symbol: '!',
+      regSymbol: '!',
+    },
+    '^': {
+      infix: {
+        symbol: '^',
+        f: power,
+        notation: 'infix',
+        precedence: 5,
+        rightToLeft: 1,
+        argCount: 2,
+      },
+      symbol: '^',
+      regSymbol: '\\^',
+    },
+    sqrt: {
+      func: {
+        symbol: 'sqrt',
+        f: sqrt,
+        notation: 'func',
+        precedence: 0,
+        rightToLeft: 0,
+        argCount: 1,
+      },
+      symbol: 'sqrt',
+      regSymbol: 'sqrt\\b',
+    },
+  },
+}
+
+export default exponentialSymbols