Question

我正在使用typescript @ 2和highlandjs库。高地的打字错过mergeWithLimit(n)功能。它：

采用Streams流并将其值和错误合并为一个单个新流，限制可以使用的未流量流的数量任何时候都在跑。

现在，此方法尚未为其DefinitlyTyped typings打字。我试图添加它，但是只有一个interface Stream<R>而没有一个流流。

然而，我如何为流媒体流创建界面？我尝试定义一个接口：

interface Stream<Stream<R>> implements Stream<R> {
    mergeWithLimit(n: number): Stream<R>;
}

但它没有编译：

365     interface Stream<Stream<R>> implements Stream<R> {
                               ~

index.d.ts(365,28): error TS1005: ',' expected.


365     interface Stream<Stream<R>> implements Stream<R> {
                                  ~

index.d.ts(365,31): error TS1109: Expression expected.


365     interface Stream<Stream<R>> implements Stream<R> {
                                               ~~~~~~

index.d.ts(365,44): error TS1005: ';' expected.

如何正确输入提示mergeWithLimit？

Answer 1

We managed typehint it correctly by defining an interface:

interface StreamOfStreams<R> extends Stream<Stream<R>> {
    /**
     * Takes a Stream of Streams and merges their values and errors into a single new Stream,
     * limitting the number of unpaused streams that can running at any one time.
     *
     * @id mergeWithLimit
     * @section Streams
     * @name Stream.mergeWithLimit()
     * @api public
     */
    mergeWithLimit(n: number): Stream<R>;
}

and we added a map defintion:

interface Stream<R> extends NodeJS.EventEmitter {
    map<U>(f: (x: R) => U): Stream<U>;
    map<S>(f: (x: R) => Stream<S>): StreamOfStreams<S>;
}

This now allows us to correctly typehint mergeWithLimit(n) by usage of:

myStream.map<YourType>(whatEverTheMapFunction).mergeWithLimit(10)

如何为highlandjs输入提示流的流？

1 个答案: