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.mozImageSmoothingEnabledCanvasRenderingContext2D.msFillRuleCanvasRenderingContext2D.oImageSmoothingEnabledCanvasRenderingContext2D.webkitImageSmoothingEnabledDocument.caretRangeFromPointDocument.createExpressionDocument.createNSResolverDocument.execCommandShowHelpDocument.exitFullscreenDocument.exitPointerLockDocument.focusDocument.fullscreenElementDocument.fullscreenEnabledDocument.getSelectionDocument.msCapsLockWarningOffDocument.msCSSOMElementFloatMetricsDocument.msElementsFromRectDocument.msElementsFromPointDocument.onvisibilitychangeDocument.onwebkitfullscreenchangeDocument.onwebkitfullscreenerrorDocument.pointerLockElementDocument.queryCommandIndetermDocument.URLUnencodedDocument.webkitCurrentFullScreenElementDocument.webkitFullscreenElementDocument.webkitFullscreenEnabledDocument.webkitIsFullScreenDocument.xmlEncodingDocument.xmlStandaloneDocument.xmlVersionDocumentType.entitiesDocumentType.internalSubsetDocumentType.notationsDOML2DeprecatedSizePropertyElement.msContentZoomFactorElement.msGetUntransformedBoundsElement.msMatchesSelectorElement.msRegionOverflowElement.msReleasePointerCaptureElement.msSetPointerCaptureElement.msZoomToElement.onwebkitfullscreenchangeElement.onwebkitfullscreenerrorElement.webkitRequestFullScreenElement.webkitRequestFullscreenElementCSSInlineStyleExtendableEventInitExtendableMessageEventInitFetchEventInitGenerateAssertionCallbackHTMLAnchorElement.MethodsHTMLAnchorElement.mimeTypeHTMLAnchorElement.namePropHTMLAnchorElement.protocolLongHTMLAnchorElement.urnHTMLAreasCollectionHTMLHeadElement.profileHTMLImageElement.msGetAsCastingSourceHTMLImageElement.msGetAsCastingSourceHTMLImageElement.msKeySystemHTMLImageElement.msPlayToDisabledHTMLImageElement.msPlayToDisabledHTMLImageElement.msPlayToPreferredSourceUriHTMLImageElement.msPlayToPreferredSourceUriHTMLImageElement.msPlayToPrimaryHTMLImageElement.msPlayToPrimaryHTMLImageElement.msPlayToSourceHTMLImageElement.msPlayToSourceHTMLImageElement.xHTMLImageElement.yHTMLInputElement.webkitdirectoryHTMLLinkElement.importHTMLMetaElement.charsetHTMLMetaElement.urlHTMLSourceElement.msKeySystemHTMLStyleElement.disabledHTMLSummaryElementMediaQueryListListenerMSAccountInfoMSAudioLocalClientEventMSAudioLocalClientEventMSAudioRecvPayloadMSAudioRecvSignalMSAudioSendPayloadMSAudioSendSignalMSConnectivityMSCredentialFilterMSCredentialParametersMSCredentialsMSCredentialSpecMSDCCEventMSDCCEventInitMSDelayMSDescriptionMSDSHEventMSDSHEventInitMSFIDOCredentialParametersMSIceAddrTypeMSIceTypeMSIceWarningFlagsMSInboundPayloadMSIPAddressInfoMSJitterMSLocalClientEventMSLocalClientEventBaseMSNetworkMSNetworkConnectivityInfoMSNetworkInterfaceTypeMSOutboundNetworkMSOutboundPayloadMSPacketLossMSPayloadBaseMSPortRangeMSRelayAddressMSSignatureParametersMSStatsTypeMSStreamReaderMSTransportDiagnosticsStatsMSUtilizationMSVideoPayloadMSVideoRecvPayloadMSVideoResolutionDistributionMSVideoSendPayloadNotificationEventInitPushEventInitPushSubscriptionChangeInitRTCIdentityAssertionResultRTCIdentityProviderRTCIdentityProviderDetailsRTCIdentityValidationResultScreen.deviceXDPIScreen.logicalXDPISVGElement.xmlbaseSVGGraphicsElement.farthestViewportElementSVGGraphicsElement.getTransformToElementSVGGraphicsElement.nearestViewportElementSVGStylableSVGTests.hasExtensionSVGTests.requiredFeaturesSyncEventInitValidateAssertionCallbackWebKitDirectoryEntryWebKitDirectoryReaderWebKitEntriesCallbackWebKitEntryWebKitErrorCallbackWebKitFileCallbackWebKitFileEntryWebKitFileSystemWindow.clearImmediateWindow.msSetImmediateWindow.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。