Knockout put current version in root (#47255)

* Put current version of knockout in the root

Previously, the code that supports the oldest version of Typescript was in the root: 3.1 and below. Newer versions were in ts*/ subdirectories.

This PR puts the newest version in the root, and older versions -- before 4.0 in this case -- in ts*/ subdirectories. This is possible because all supported versions of the Typescript now understand the typesVersions property in package.json.

This PR needs a new version of DefinitelyTyped-tools and dtslint, which I will ship soon. It also needs to be brought up to date with master.

* Delete ts4.0/

types/knockout/index.d.ts

@@ -10,7 +10,6 @@
 //                 Retsam <https://github.com/Retsam>
 //                 Rey Pena <https://github.com/ReyPena>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.3
 
 interface KnockoutSubscribableFunctions<T> {
     /**
@@ -286,6 +285,7 @@ interface KnockoutObservableStatic {
     fn: KnockoutObservableFunctions<any>;
 
     <T>(value: T): KnockoutObservable<T>;
+    <T>(value: any): KnockoutObservable<T>;
     <T = any>(value: null): KnockoutObservable<T | null>
     <T = any>(): KnockoutObservable<T | undefined>
 }

types/knockout/package.json

@@ -2,9 +2,9 @@
     "private": true,
     "types": "index",
     "typesVersions": {
-        ">=4.0.0-0": {
+        "<=3.9": {
             "*": [
-                "ts4.0/*"
+                "ts3.9/*"
             ]
         }
     }

types/knockout/ts3.9/index.d.ts

@@ -1,16 +1,3 @@
-// Type definitions for Knockout v3.4.0
-// Project: http://knockoutjs.com
-// Definitions by: Boris Yankov <https://github.com/borisyankov>,
-//                 Igor Oleinikov <https://github.com/Igorbek>,
-//                 Clément Bourgeois <https://github.com/moonpyk>,
-//                 Matt Brooks <https://github.com/EnableSoftware>,
-//                 Benjamin Eckardt <https://github.com/BenjaminEckardt>,
-//                 Mathias Lorenzen <https://github.com/ffMathy>,
-//                 Leonardo Lombardi <https://github.com/ltlombardi>
-//                 Retsam <https://github.com/Retsam>
-//                 Rey Pena <https://github.com/ReyPena>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
 interface KnockoutSubscribableFunctions<T> {
     /**
      * Notify subscribers of knockout "change" event. This doesn't actually change the observable value.
@@ -285,7 +272,6 @@ interface KnockoutObservableStatic {
     fn: KnockoutObservableFunctions<any>;
 
     <T>(value: T): KnockoutObservable<T>;
-    <T>(value: any): KnockoutObservable<T>;
     <T = any>(value: null): KnockoutObservable<T | null>
     <T = any>(): KnockoutObservable<T | undefined>
 }