Merge pull request #22803 from Microsoft/updateTo2.9

Update master version to 2.9.

package.json

@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "http://typescriptlang.org/",
-    "version": "2.8.0",
+    "version": "2.9.0",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [

src/compiler/core.ts

@@ -4,7 +4,7 @@
 namespace ts {
     // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
     // If changing the text in this section, be sure to test `configureNightly` too.
-    export const versionMajorMinor = "2.8";
+    export const versionMajorMinor = "2.9";
     /** The version of the TypeScript compiler release */
     export const version = `${versionMajorMinor}.0-dev`;
 }

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -2842,7 +2842,7 @@ declare namespace ts {
     }
 }
 declare namespace ts {
-    const versionMajorMinor = "2.8";
+    const versionMajorMinor = "2.9";
     /** The version of the TypeScript compiler release */
     const version: string;
 }

tests/baselines/reference/api/typescript.d.ts

@@ -2842,7 +2842,7 @@ declare namespace ts {
     }
 }
 declare namespace ts {
-    const versionMajorMinor = "2.8";
+    const versionMajorMinor = "2.9";
     /** The version of the TypeScript compiler release */
     const version: string;
 }