13af6ab5fSopenharmony_ci# Mapped type expression is not supported 23af6ab5fSopenharmony_ci 33af6ab5fSopenharmony_ciRule ``arkts-no-mapped-types`` 43af6ab5fSopenharmony_ci 53af6ab5fSopenharmony_ci**Severity: error** 63af6ab5fSopenharmony_ci 73af6ab5fSopenharmony_ciArkTS does not support mapped types. Use other language idioms and regular 83af6ab5fSopenharmony_ciclasses to achieve that same behavior. 93af6ab5fSopenharmony_ci 103af6ab5fSopenharmony_ci 113af6ab5fSopenharmony_ci## TypeScript 123af6ab5fSopenharmony_ci 133af6ab5fSopenharmony_ci 143af6ab5fSopenharmony_ci``` 153af6ab5fSopenharmony_ci 163af6ab5fSopenharmony_ci type OptionsFlags<Type> = { 173af6ab5fSopenharmony_ci [Property in keyof Type]: boolean 183af6ab5fSopenharmony_ci } 193af6ab5fSopenharmony_ci 203af6ab5fSopenharmony_ci``` 213af6ab5fSopenharmony_ci 223af6ab5fSopenharmony_ci## ArkTS 233af6ab5fSopenharmony_ci 243af6ab5fSopenharmony_ci 253af6ab5fSopenharmony_ci``` 263af6ab5fSopenharmony_ci 273af6ab5fSopenharmony_ci class C { 283af6ab5fSopenharmony_ci n: number = 0 293af6ab5fSopenharmony_ci s: string = "" 303af6ab5fSopenharmony_ci } 313af6ab5fSopenharmony_ci 323af6ab5fSopenharmony_ci class CFlags { 333af6ab5fSopenharmony_ci n: boolean = false 343af6ab5fSopenharmony_ci s: boolean = false 353af6ab5fSopenharmony_ci } 363af6ab5fSopenharmony_ci 373af6ab5fSopenharmony_ci``` 383af6ab5fSopenharmony_ci 39