typehint class constructor with interface
I have the following interface
interface IDownloader {
download()
}
and several classes implementing it:
class DownloaderA implements IDownloader {
...
}
class DownloaderB implements IDownloader {
...
}
Then I have a class that should receive constructors of the Downloader classes as parameters. I can do it when I specify a specific downloader like this:
class DownloadWorker {
constructor(downloader: typeof DownloaderA) {
}
}
but I cannot typehint an interface in the same way:
class DownloadWorker {
constructor(downloader: typeof IDownloader) {
}
}
How can I typehint the downloader argument so I can pass DownloaderA and DownloaderB constructors?
typescript
asked Jan 18 at 21:27
ChrisChris
2,41631949
add a comment |
I have the following interface
interface IDownloader {
download()
}
and several classes implementing it:
class DownloaderA implements IDownloader {
...
}
class DownloaderB implements IDownloader {
...
}
Then I have a class that should receive constructors of the Downloader classes as parameters. I can do it when I specify a specific downloader like this:
class DownloadWorker {
constructor(downloader: typeof DownloaderA) {
}
}
but I cannot typehint an interface in the same way:
class DownloadWorker {
constructor(downloader: typeof IDownloader) {
}
}
How can I typehint the downloader argument so I can pass DownloaderA and DownloaderB constructors?
typescript
asked Jan 18 at 21:27
ChrisChris
2,41631949
add a comment |
I have the following interface
interface IDownloader {
download()
}
and several classes implementing it:
class DownloaderA implements IDownloader {
...
}
class DownloaderB implements IDownloader {
...
}
Then I have a class that should receive constructors of the Downloader classes as parameters. I can do it when I specify a specific downloader like this:
class DownloadWorker {
constructor(downloader: typeof DownloaderA) {
}
}
but I cannot typehint an interface in the same way:
class DownloadWorker {
constructor(downloader: typeof IDownloader) {
}
}
How can I typehint the downloader argument so I can pass DownloaderA and DownloaderB constructors?
typescript
asked Jan 18 at 21:27
ChrisChris
2,41631949
I have the following interface
interface IDownloader {
download()
}
and several classes implementing it:
class DownloaderA implements IDownloader {
...
}
class DownloaderB implements IDownloader {
...
}
Then I have a class that should receive constructors of the Downloader classes as parameters. I can do it when I specify a specific downloader like this:
class DownloadWorker {
constructor(downloader: typeof DownloaderA) {
}
}
but I cannot typehint an interface in the same way:
class DownloadWorker {
constructor(downloader: typeof IDownloader) {
}
}
How can I typehint the downloader argument so I can pass DownloaderA and DownloaderB constructors?
typescript
typescript
asked Jan 18 at 21:27
ChrisChris
2,41631949
asked Jan 18 at 21:27
ChrisChris
2,41631949
asked Jan 18 at 21:27
ChrisChris
2,41631949
asked Jan 18 at 21:27
ChrisChris
2,41631949
asked Jan 18 at 21:27
ChrisChris
2,41631949
2,41631949
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can use a constructor signature:
class DownloadWorker {
constructor(downloader: new () => IDownloader) {
}
}
The signature is similar to a function signature, but the new makes it callable with the new operator to create a new object.
The above code accepts a constructor (ie a class) with no parameters. you can add specific parameters, or define it as new (...a:any) => IDownloader to allow a constructor with any arguments.
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use a constructor signature:
class DownloadWorker {
constructor(downloader: new () => IDownloader) {
}
}
The signature is similar to a function signature, but the new makes it callable with the new operator to create a new object.
The above code accepts a constructor (ie a class) with no parameters. you can add specific parameters, or define it as new (...a:any) => IDownloader to allow a constructor with any arguments.
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
add a comment |
You can use a constructor signature:
class DownloadWorker {
constructor(downloader: new () => IDownloader) {
}
}
The signature is similar to a function signature, but the new makes it callable with the new operator to create a new object.
The above code accepts a constructor (ie a class) with no parameters. you can add specific parameters, or define it as new (...a:any) => IDownloader to allow a constructor with any arguments.
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
add a comment |
You can use a constructor signature:
class DownloadWorker {
constructor(downloader: new () => IDownloader) {
}
}
The signature is similar to a function signature, but the new makes it callable with the new operator to create a new object.
The above code accepts a constructor (ie a class) with no parameters. you can add specific parameters, or define it as new (...a:any) => IDownloader to allow a constructor with any arguments.
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
You can use a constructor signature:
class DownloadWorker {
constructor(downloader: new () => IDownloader) {
}
}
The signature is similar to a function signature, but the new makes it callable with the new operator to create a new object.
The above code accepts a constructor (ie a class) with no parameters. you can add specific parameters, or define it as new (...a:any) => IDownloader to allow a constructor with any arguments.
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
answered Jan 18 at 21:32
Titian Cernicova-DragomirTitian Cernicova-Dragomir
61.6k33755
61.6k33755
add a comment |
add a comment |
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