Typescript - Best Practices

#typescript #best #practices

Let, Var and Const

Use const for variables that won't be reassigned.
Use let for variables that will be reassigned.
Avoid var in new TypeScript code.

Best References:
AWS TypeScript

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11 Tips That Make You a Better Typescript Programmer

1 Think in {Set}

Type is an everyday concept to programmers, but it’s surprisingly difficult to define it succinctly. I find it helpful to use Set as a conceptual model instead.

#2 Understand declared type and narrowed type

One extremely powerful typescript feature is automatic type narrowing based on control flow. This means a variable has two types associated with it at any specific point of code location: a declaration type and a narrowed type.

#3 Use discriminated union instead of optional fields

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