Syntax highlighting misidentifies method shorthand function blocks as object literals in TypeScript when the return type of the function is an object

[BalaM314]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.75.1
• OS Version: Windows 10.0.19045

In Typescript, tokenization misidentifies the code blocks of function properties declared using the object literal method shorthand that have an object return type as object literals.

Function properties can be declared on objects using the method shorthand syntax:

let obj = {
    foo(){
        //code
    }
};

In TypeScript, these functions can also have a return type:

let obj = {
    foo():number {
        return 5;
    }
};

If this return type is an object type, and there is no space between the object type and the function body, tokenization thinks the function body is an object literal. This issue does not appear if the function is created without the shorthand or without an object return type.

Steps to Reproduce:

1. Copy the following code:

   ({
   foo():{}{
       let bar;//This line is gray, because tokenization thinks it is inside an object literal scope.
       //The issue goes away if a space is present between the return type and the method block.
   },
   foo: ():{}=>{
       let bar;//This works fine.
   }
   });
   let bar;
   function baz():{}{
   let bar;//This also works fine.
   }

   into VS Code.

[VSCodeTriageBot]

Thanks for creating this issue! It looks like you may be using an old version of VS Code, the latest stable release is 1.75.1. Please try upgrading to the latest version and checking whether this issue remains.

Happy Coding!

[BalaM314]

Issue remains in latest version.