Error Handling Patterns in TypeScript: Beyond Try-Catch

Error Handling Patterns in TypeScript: Beyond Try-Catch Try-catch blocks scattered everywhere. No idea what errors a function can throw. Callers forget to handle edge cases. Here are better patterns. The Result Type Instead of throwing, return a discriminated union: type Result < T , E = Error > = | { ok : true ; value : T } | { ok : false ; error : E }; function divide ( a : number , b : number ): Result < number , string > { if ( b === 0 ) return { ok : false , error : " Division by zero " }; return { ok : true , value : a / b }; } const result = divide ( 10 , 0 ); if ( result . ok ) { console . log ( result . value ); // TypeScript knows this is number } else { console . error ( result . error ); // TypeScript knows this is string } Custom Error Classes class AppError extends Error { constructor ( message : string , public code : string , public statusCode : number = 500 , public isOperational : boolean = true ) { super ( message ); this . name = " AppError " ; } } class NotFoundErr