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TypeScript 3.1

一些浏览器厂商特定的类型从lib.d.ts中被移除

TypeScript内置的.d.ts库(lib.d.ts等)现在会部分地从DOM规范的Web IDL文件中生成。 因此有一些浏览器厂商特定的类型被移除了。

点击这里查看被移除类型的完整列表：

* `CanvasRenderingContext2D.mozImageSmoothingEnabled` * `CanvasRenderingContext2D.msFillRule` * `CanvasRenderingContext2D.oImageSmoothingEnabled` * `CanvasRenderingContext2D.webkitImageSmoothingEnabled` * `Document.caretRangeFromPoint` * `Document.createExpression` * `Document.createNSResolver` * `Document.execCommandShowHelp` * `Document.exitFullscreen` * `Document.exitPointerLock` * `Document.focus` * `Document.fullscreenElement` * `Document.fullscreenEnabled` * `Document.getSelection` * `Document.msCapsLockWarningOff` * `Document.msCSSOMElementFloatMetrics` * `Document.msElementsFromRect` * `Document.msElementsFromPoint` * `Document.onvisibilitychange` * `Document.onwebkitfullscreenchange` * `Document.onwebkitfullscreenerror` * `Document.pointerLockElement` * `Document.queryCommandIndeterm` * `Document.URLUnencoded` * `Document.webkitCurrentFullScreenElement` * `Document.webkitFullscreenElement` * `Document.webkitFullscreenEnabled` * `Document.webkitIsFullScreen` * `Document.xmlEncoding` * `Document.xmlStandalone` * `Document.xmlVersion` * `DocumentType.entities` * `DocumentType.internalSubset` * `DocumentType.notations` * `DOML2DeprecatedSizeProperty` * `Element.msContentZoomFactor` * `Element.msGetUntransformedBounds` * `Element.msMatchesSelector` * `Element.msRegionOverflow` * `Element.msReleasePointerCapture` * `Element.msSetPointerCapture` * `Element.msZoomTo` * `Element.onwebkitfullscreenchange` * `Element.onwebkitfullscreenerror` * `Element.webkitRequestFullScreen` * `Element.webkitRequestFullscreen` * `ElementCSSInlineStyle` * `ExtendableEventInit` * `ExtendableMessageEventInit` * `FetchEventInit` * `GenerateAssertionCallback` * `HTMLAnchorElement.Methods` * `HTMLAnchorElement.mimeType` * `HTMLAnchorElement.nameProp` * `HTMLAnchorElement.protocolLong` * `HTMLAnchorElement.urn` * `HTMLAreasCollection` * `HTMLHeadElement.profile` * `HTMLImageElement.msGetAsCastingSource` * `HTMLImageElement.msGetAsCastingSource` * `HTMLImageElement.msKeySystem` * `HTMLImageElement.msPlayToDisabled` * `HTMLImageElement.msPlayToDisabled` * `HTMLImageElement.msPlayToPreferredSourceUri` * `HTMLImageElement.msPlayToPreferredSourceUri` * `HTMLImageElement.msPlayToPrimary` * `HTMLImageElement.msPlayToPrimary` * `HTMLImageElement.msPlayToSource` * `HTMLImageElement.msPlayToSource` * `HTMLImageElement.x` * `HTMLImageElement.y` * `HTMLInputElement.webkitdirectory` * `HTMLLinkElement.import` * `HTMLMetaElement.charset` * `HTMLMetaElement.url` * `HTMLSourceElement.msKeySystem` * `HTMLStyleElement.disabled` * `HTMLSummaryElement` * `MediaQueryListListener` * `MSAccountInfo` * `MSAudioLocalClientEvent` * `MSAudioLocalClientEvent` * `MSAudioRecvPayload` * `MSAudioRecvSignal` * `MSAudioSendPayload` * `MSAudioSendSignal` * `MSConnectivity` * `MSCredentialFilter` * `MSCredentialParameters` * `MSCredentials` * `MSCredentialSpec` * `MSDCCEvent` * `MSDCCEventInit` * `MSDelay` * `MSDescription` * `MSDSHEvent` * `MSDSHEventInit` * `MSFIDOCredentialParameters` * `MSIceAddrType` * `MSIceType` * `MSIceWarningFlags` * `MSInboundPayload` * `MSIPAddressInfo` * `MSJitter` * `MSLocalClientEvent` * `MSLocalClientEventBase` * `MSNetwork` * `MSNetworkConnectivityInfo` * `MSNetworkInterfaceType` * `MSOutboundNetwork` * `MSOutboundPayload` * `MSPacketLoss` * `MSPayloadBase` * `MSPortRange` * `MSRelayAddress` * `MSSignatureParameters` * `MSStatsType` * `MSStreamReader` * `MSTransportDiagnosticsStats` * `MSUtilization` * `MSVideoPayload` * `MSVideoRecvPayload` * `MSVideoResolutionDistribution` * `MSVideoSendPayload` * `NotificationEventInit` * `PushEventInit` * `PushSubscriptionChangeInit` * `RTCIdentityAssertionResult` * `RTCIdentityProvider` * `RTCIdentityProviderDetails` * `RTCIdentityValidationResult` * `Screen.deviceXDPI` * `Screen.logicalXDPI` * `SVGElement.xmlbase` * `SVGGraphicsElement.farthestViewportElement` * `SVGGraphicsElement.getTransformToElement` * `SVGGraphicsElement.nearestViewportElement` * `SVGStylable` * `SVGTests.hasExtension` * `SVGTests.requiredFeatures` * `SyncEventInit` * `ValidateAssertionCallback` * `WebKitDirectoryEntry` * `WebKitDirectoryReader` * `WebKitEntriesCallback` * `WebKitEntry` * `WebKitErrorCallback` * `WebKitFileCallback` * `WebKitFileEntry` * `WebKitFileSystem` * `Window.clearImmediate` * `Window.msSetImmediate` * `Window.setImmediate`

推荐：

如果你的运行时能够保证这些名称是可用的（比如一个仅针对IE的应用），那么可以在本地添加那些声明，例如：

对于Element.msMatchesSelector，在本地的dom.ie.d.ts文件里添加如下代码：

interface Element {
    msMatchesSelector(selectors: string): boolean;
}

相似地，若要添加clearImmediate和setImmediate，你可以在本地的dom.ie.d.ts里添加Window声明：

interface Window {
    clearImmediate(handle: number): void;
    setImmediate(handler: (...args: any[]) => void): number;
    setImmediate(handler: any, ...args: any[]): number;
}

细化的函数现在会使用{}，Object和未约束的泛型参数的交叉类型

下面的代码如今会提示x不能被调用：

function foo<T>(x: T | (() => string)) {
    if (typeof x === "function") {
        x();
//      ~~~
// Cannot invoke an expression whose type lacks a call signature. Type '(() => string) | (T & Function)' has no compatible call signatures.
    }
}

这是因为，不同于以前的T会被细化掉，如今T会被扩展成T & Function。 然而，因为这个类型没有声明调用签名，类型系统无法找到通用的调用签名可以适用于T & Function和() => string。

因此，考虑使用一个更确切的类型，而不是{}或Object，并且考虑给T添加额外的约束条件。