Parameter decorator is part of TypeScript experimental decorator implementation, and is not in the tc39 decorator proposal that is at stage 3. While they could potentially be added in the future, they should not be allowed along with other "planned" decorator feature like class/method/function decorators.
Input code
class ExampleClass {
method(@deprecated x = 3) {}
}
Config
No response
Playground link (or link to the minimal reproduction)
Describe the bug
Parameter decorator is part of TypeScript experimental decorator implementation, and is not in the tc39 decorator proposal that is at stage 3. While they could potentially be added in the future, they should not be allowed along with other "planned" decorator feature like class/method/function decorators.
Input code
Config
No response
Playground link (or link to the minimal reproduction)
https://play.swc.rs/?version=1.7.36&code=H4sIAAAAAAAAA0vOSSwuVnCtSMwtyEl1BnOquRQUclNLMvJTNBxSUguKUpMTS1JTFCoUbBWMNRWqa7lqAQKoNJE1AAAA&config=H4sIAAAAAAAAA42VwY4aMQyG7%2FsUaM490F2pqvoAvfUZopA4Q2gmHsUOC1rx7vUEhtLFM%2BoFMf5ix3Z%2BJx8vm013INf92HzIX%2FkYbSEo92%2Bx0DmzPYmlAzdYciWO3H2Z6YEmFGwiuNs8OCyWsZAgLhUauFx5x7b0wC0evW5ft7dYXUIk%2BDdWN8Qcw%2FkxG4fDWIDowSZWCVkHyEyfc2ms4PucyYN9h5jA5hViLJmYGXooWmCHKdmRwBxtUaJMmdoSCbUtJlgZvBkLjirPPnLELHs%2BUw%2FWG4ceFBQLOI5H0NxkL3HLJOUp9TTsYVf7vingkzccbaqWlT3h1I5EslWi7jESm1Cz1sIrXOjBFd6a%2B9kzBlOAa8nPfgeMeeFMfgNIB5IlynYALW5bEURPS95h1TPmIJLls8JF31qVGXppqokxKJ2dOgOFo3aaBXx1MHXWaenc8EL7KHowEIJoRQlN75HdXtuUzyNgUICcrw2aqq7A3KdwgU8DsYJ%2FSpWsC%2By2YrC8X6Z0HnaYVjYYgPfoVxbIUTAu4yK3xGlc5jV7EGmAV5dUauD5EpABYDSp3ZdP2pDxkIimT7hTr4lRdN4O8e1mu9yv6MHmvl0CD5co45jgCGlJ2%2F8xN6tUEj5OUp%2FH%2FWmk4bumVCvTGL9uZzSX8jL%2FtqK6AX19KKgJ9frGfOv%2BLpqfk7lRXaRfs2N7qC5%2FACIzE1gSBwAA
SWC Info output
No response
Expected behavior
An error will be emitted.
Actual behavior
An AST is generated using TypeScript experimental decorator behavior
Version
1.7.36
Additional context
No response