Can a Descriptor change type in Typescript?
up vote
1
down vote
favorite
I'm trying to make descriptor which can change return type in typescript but I don't know how to do this.
Here is the code and what I tried:
function changeReturnType()
return <T extends unknown>(
target: ,
key: string
class Foo
@changeReturnType()
square ()
return 1;
let val = new Foo().square(); // I hope ts know here is string
console.dir(
val,
type: typeof val,
);
javascript node.js typescript types descriptor
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
asked Nov 11 at 6:06
bluelovers
1388
add a comment |
up vote
1
down vote
favorite
I'm trying to make descriptor which can change return type in typescript but I don't know how to do this.
Here is the code and what I tried:
function changeReturnType()
return <T extends unknown>(
target: ,
key: string
class Foo
@changeReturnType()
square ()
return 1;
let val = new Foo().square(); // I hope ts know here is string
console.dir(
val,
type: typeof val,
);
javascript node.js typescript types descriptor
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
asked Nov 11 at 6:06
bluelovers
1388
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm trying to make descriptor which can change return type in typescript but I don't know how to do this.
Here is the code and what I tried:
function changeReturnType()
return <T extends unknown>(
target: ,
key: string
class Foo
@changeReturnType()
square ()
return 1;
let val = new Foo().square(); // I hope ts know here is string
console.dir(
val,
type: typeof val,
);
javascript node.js typescript types descriptor
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
asked Nov 11 at 6:06
bluelovers
1388
I'm trying to make descriptor which can change return type in typescript but I don't know how to do this.
Here is the code and what I tried:
function changeReturnType()
return <T extends unknown>(
target: ,
key: string
class Foo
@changeReturnType()
square ()
return 1;
let val = new Foo().square(); // I hope ts know here is string
console.dir(
val,
type: typeof val,
);
javascript node.js typescript types descriptor
javascript node.js typescript types descriptor
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
asked Nov 11 at 6:06
bluelovers
1388
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
asked Nov 11 at 6:06
bluelovers
1388
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
edited Nov 11 at 7:15
Roy Scheffers
2,12281625
2,12281625
asked Nov 11 at 6:06
bluelovers
1388
asked Nov 11 at 6:06
bluelovers
1388
asked Nov 11 at 6:06
bluelovers
1388
1388
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
0
down vote
This is currently not possible in TypeScript but you may look at this comment and modify hack described there to your needs (i.e. for method decorator usage).
answered Nov 11 at 10:10
syntagma
12.4k1248103
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
This is currently not possible in TypeScript but you may look at this comment and modify hack described there to your needs (i.e. for method decorator usage).
answered Nov 11 at 10:10
syntagma
12.4k1248103
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
add a comment |
up vote
0
down vote
This is currently not possible in TypeScript but you may look at this comment and modify hack described there to your needs (i.e. for method decorator usage).
answered Nov 11 at 10:10
syntagma
12.4k1248103
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
add a comment |
up vote
0
down vote
up vote
0
down vote
This is currently not possible in TypeScript but you may look at this comment and modify hack described there to your needs (i.e. for method decorator usage).
answered Nov 11 at 10:10
syntagma
12.4k1248103
This is currently not possible in TypeScript but you may look at this comment and modify hack described there to your needs (i.e. for method decorator usage).
answered Nov 11 at 10:10
syntagma
12.4k1248103
answered Nov 11 at 10:10
syntagma
12.4k1248103
answered Nov 11 at 10:10
syntagma
12.4k1248103
answered Nov 11 at 10:10
syntagma
12.4k1248103
12.4k1248103
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
add a comment |
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
The situation is different in linked comment. Returned type is ignored in class decorator, while in method decorator it's taken into account, so decorated method type is incompatible with original method.
– estus
Nov 11 at 15:32
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53246289%2fcan-a-descriptor-change-type-in-typescript%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
