JS incorrectly highlights template strings syntax

[dwelle]

• VSCode Version: 1.42.1; 1.43.0-insider
• OS Version: win7

What

VSCode JS/TS syntax highlighter doesn't parse template strings correctly in special circumstances:

Steps to Reproduce:

enter this JS code:

if ( !/\(/.test("a") ) {} // negation of a regex necessary

if ( true ) {
    obj[prop]; // obj property access inside a conditional necessary
}

const str = `template:string`;
//               \_ not recognized as template string (the colon is necessary)

// VSCode thinks *this* is template string

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

[mjbvz]

Duplicate of microsoft/TypeScript-TmLanguage#806