13af6ab5fSopenharmony_ci# Use ``class`` instead of a type with constructor signature 23af6ab5fSopenharmony_ci 33af6ab5fSopenharmony_ciRule ``arkts-no-ctor-signatures-type`` 43af6ab5fSopenharmony_ci 53af6ab5fSopenharmony_ci**Severity: error** 63af6ab5fSopenharmony_ci 73af6ab5fSopenharmony_ciArkTS does not support constructor signatures in object types. Use classes 83af6ab5fSopenharmony_ciinstead. 93af6ab5fSopenharmony_ci 103af6ab5fSopenharmony_ci 113af6ab5fSopenharmony_ci## TypeScript 123af6ab5fSopenharmony_ci 133af6ab5fSopenharmony_ci 143af6ab5fSopenharmony_ci``` 153af6ab5fSopenharmony_ci 163af6ab5fSopenharmony_ci class SomeObject {} 173af6ab5fSopenharmony_ci 183af6ab5fSopenharmony_ci type SomeConstructor = { 193af6ab5fSopenharmony_ci new (s: string): SomeObject 203af6ab5fSopenharmony_ci } 213af6ab5fSopenharmony_ci 223af6ab5fSopenharmony_ci function fn(ctor: SomeConstructor) { 233af6ab5fSopenharmony_ci return new ctor("hello") 243af6ab5fSopenharmony_ci } 253af6ab5fSopenharmony_ci 263af6ab5fSopenharmony_ci``` 273af6ab5fSopenharmony_ci 283af6ab5fSopenharmony_ci## ArkTS 293af6ab5fSopenharmony_ci 303af6ab5fSopenharmony_ci 313af6ab5fSopenharmony_ci``` 323af6ab5fSopenharmony_ci 333af6ab5fSopenharmony_ci class SomeObject { 343af6ab5fSopenharmony_ci public f: string 353af6ab5fSopenharmony_ci constructor (s: string) { 363af6ab5fSopenharmony_ci this.f = s 373af6ab5fSopenharmony_ci } 383af6ab5fSopenharmony_ci } 393af6ab5fSopenharmony_ci 403af6ab5fSopenharmony_ci function fn(s: string): SomeObject { 413af6ab5fSopenharmony_ci return new SomeObject(s) 423af6ab5fSopenharmony_ci } 433af6ab5fSopenharmony_ci 443af6ab5fSopenharmony_ci``` 453af6ab5fSopenharmony_ci 463af6ab5fSopenharmony_ci## See also 473af6ab5fSopenharmony_ci 483af6ab5fSopenharmony_ci- Recipe 014: Use ``class`` instead of a type with call signature (``arkts-no-call-signatures``) 493af6ab5fSopenharmony_ci 503af6ab5fSopenharmony_ci 51