Files with .es6 suffix are treated as TypeScript files

@jbutz

From @jbutz on April 6, 2016 18:12

Steps to Reproduce:

Create a new file with the extension .es6 and the following code

class Testing {
   constructor() {
       this.myValue = "Hello World";
   }

   test() {
       return this.myValue;
   }
}

The Language Mode is automatically set to "JavaScript", but on this.myValue you get Property 'myValue' does not exist on type 'Testing' errors.
Close the file and rename it to use a .js extension
Open the file and notice that the errors are gone

Copied from original issue: microsoft/vscode#5046

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