1# Definite assignment assertions are not supported 2 3Rule ``arkts-no-definite-assignment`` 4 5**Severity: warning** 6 7ArkTS does not support definite assignment assertions ``let v!: T`` because 8they are considered an excessive compiler hint. 9Use declaration with initialization instead. 10 11 12## TypeScript 13 14 15``` 16 17 let x!: number // Hint: x will be initialized before usage 18 19 initialize() 20 21 function initialize() { 22 x = 10 23 } 24 25 console.log("x = " + x) 26 27``` 28 29## ArkTS 30 31 32``` 33 34 function initialize() : number { 35 return 10 36 } 37 38 let x: number = initialize() 39 40 console.log("x = " + x) 41 42``` 43 44 45