How to write AST selector to match only object key (and not also object value) ?

[lukasMega]

How to write AST selector to match only object key (and not also object value) ?

my rule (partially working) is:

• eslint no-restricted-syntax: ["error", 
      {
          selector: 'Property[computed=true] > MemberExpression, Property[computed=true] > Literal',
          message: 'computed object properties are not allowed!',     
      }
  ]

here is example:

/*eslint no-restricted-syntax: ["error", 
    {
        selector: 'Property[computed=true]:has(MemberExpression) > MemberExpression',
        message: 'compute object properties are not allowed!',     
    }
]*/

example[T.err] = { [S.stopped]: S.running }; 
/*                 ~~~~~~~~~~~ 
                        ↪ ❗️ match only object key in case it's computed 
*/
example[T.okk] = { nameOk: S.running }; // ✅ here is all ok, no match

const m = $({
    [S.ready]: {                       // ✅ here is correctly matched only object key (computed)
        actions: { onEnter, onExit },
        transitions: { start },
    },
    ['notOk']: notOkValue,
    nameOk: { stuff },
});

My attempts:

• Property[computed=true]:has(MemberExpression) > MemberExpression - is partially working
• Property[computed=true] > MemberExpression - the same

I tried to use :first-child:

• Property[computed=true] > MemberExpression:first-child - not working as I expected

I'm using also https://astexplorer.net/ to see generated tree from code.

Thank you in advance for help.

[lukasMega]

Ok, I found solution finally.
I hope that this information will be beneficial to those who encounter it in the future.

✅ SOLUTION:

• ObjectExpression> Property[computed=true] > MemberExpression.key

  • it's more specific

• Property[computed=true] > :expression.key

  • more generic probably, definitely shorter.

---

✅ SOLUTION (final):

//update:
Thank you @fisker, it's even shorter and working as expected:

• Property[computed=true] > .key

BTW this is nice place to try AST selector with ESLint, however it's for Typescript: https://typescript-eslint.io/play/...

[fisker]

Property[computed=true] > .key is even shorter, and it should work.