Advanced TypeScript Fundamentals by Marius Schulz

• Use the Optional Chaining Operator in TypeScript
• Use the Nullish Coalescing Operator in TypeScript
• Statically Type Unknown Values with TypeScript's unknown Type
• Narrow the unknown Type with TypeScript's Assertion Functions
• Create Private Class Fields Using TypeScript's private Modifier
• Ensure Initialization of Class Instance Properties in TypeScript
• Declare Read-Only Array Types in TypeScript
• Prevent Type Widening of Object Literals with TypeScript's const Assertions
• Implement a NonNullish<T> Conditional Type in TypeScript
• Statically Type String Literals with Template Literal Types in TypeScript
• Perform null Checks with Assertion Functions
• Create Truly Private Class Fields Using the #fieldName Syntax
• Encapsulate Truly Private Variables in a Closure
• Declare Read-Only Tuple Types in TypeScript
• Prevent Type Widening of Array Literals with TypeScript's const Assertions
• Implement and Type Enum-Style Objects in TypeScript
• Implement a ReturnTypeOf<T> Conditional Type in TypeScript
• Use TypeScript's Mapped Types and Template Literal Types Together