An error I made when defining enums/generated as union types

[goto40]

Use:

MyEnum returns string: 'on'|'off';

This returns 'on'|'off'.

Don't:

MyEnum returns string: ON|OFF;
ON returns string: 'on';  // define 'on', used at different location in my grammar
OFF returns string: 'off'; // define 'off', used at different location in my grammar

Here MyEnum returns string.

Reason for the first: type safety. In the second case a string is returned by MyEnum. In the first it is 'on'|'off'.

[spoenemann]

This could be improved in the type inference. The second variant could be generated as

export type MyEnum = ON | OFF
export type ON = 'on'
export type OFF = 'off'