tests/cases/compiler/accessorsNotAllowedInES3.ts(3,9): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. tests/cases/compiler/accessorsNotAllowedInES3.ts(5,15): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. ==== tests/cases/compiler/accessorsNotAllowedInES3.ts (2 errors) ==== class C { get x(): number { return 1; } ~ !!! error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. } var y = { get foo() { return 3; } }; ~~~ !!! error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.