JavaScript Module

• JavaScript module is a file containing related code.
• Module executed once loaded.
• A module code can contain variable declarations, function declarations, etc.
  • These declarations are local to the module by default.
  • We export them if we want other modules to import and use them.
• A module can import other modules via Module Specifiers.
  • Module Specifiers can be:
    • Relative Paths — ../schedule/model.
    • Absolute Path — /lib/schedule/model
    • Names — date-fns
• Modules are singletons; even if we import them multiple times, only a single instance will exist.

Reference

• CommonJS Module Specification