Project: esmodule
Task (easy): Named function 'square' contains param value (number) and returns the square result of param value. Named constant 'PI' (number, value is '3.1415926'). Save and export 'square' and 'PI' to es-module 'modules/math.js'. Import from 'modules/math.js' as namespace 'math' in 'index.js' and call `log('PI', math.PI); log('square', math.square(2))`.