Merge #3296

3296: vscode: bump TypeScript version r=matklad a=Veetaha

There is a new [`type-only` import and export feature](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html#-type-only-imports-and-export), but let's keep our codebase as simple as it is now.
Also, top-level await 🎉, though with a caveat ))

![image](https://user-images.githubusercontent.com/36276403/75185341-93629b00-574e-11ea-8d5c-4a4293f140f7.png)


Co-authored-by: Veetaha <[email protected]>

Author: bors[bot]

editors/code/package-lock.json

@@ -42,7 +42,7 @@
         "eslint": "^6.8.0",
         "rollup": "^1.31.1",
         "tslib": "^1.10.0",
-        "typescript": "^3.7.5",
+        "typescript": "^3.8.2",
         "typescript-formatter": "^7.2.2",
         "vsce": "^1.73.0"
     },