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readonlyInNonPropertyParameters.ts(3,9): error TS2369: A parameter property is only allowed in a constructor implementation.
readonlyInNonPropertyParameters.ts(4,8): error TS2369: A parameter property is only allowed in a constructor implementation.
readonlyInNonPropertyParameters.ts(6,2): error TS2369: A parameter property is only allowed in a constructor implementation.
==== readonlyInNonPropertyParameters.ts (3 errors) ====
// `readonly` won't work outside of property parameters
class X {
method(readonly x: number) {}
~~~~~~~~~~~~~~~~~~
!!! error TS2369: A parameter property is only allowed in a constructor implementation.
set x(readonly value: number) {}
~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2369: A parameter property is only allowed in a constructor implementation.
}
(readonly x) => 0;
~~~~~~~~~~
!!! error TS2369: A parameter property is only allowed in a constructor implementation.
// OK to use `readonly` as a name
(readonly) => 0;
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