Typescript

JavaScript with types

2023-01-27

• Official Site

• Handbook

Notes

• Default target is ES3, pretty old. Use --target es2015 for browsers, and --target esnext for servers.

• Good to have noImplicitAny and strictNullChecks on.

• Always prefer using interface over type unless explicitly needed.

  • The former is extendable and mergable
  • It shows up by name in error messages.
  • type can alias existing types (or interfaces): type Username = string | IUsername.
  • type ColorAndCircle = Color & Circle is an intersection of two interfaces.