Bug Report

🔎 Search Terms

comments, removeComments, implicit semicolon

🕗 Version & Regression Information

I first noticed this in version 4.2.4. I have not tried earlier versions. It is still happening as of 4.3.5.

⏯ Playground Link

https://www.typescriptlang.org/play?target=1#code/FAYw9gdgzgLgBAMzGOBeOBGADFg3MUSWOAcwFMYAJMgSxIAt50AKASjQD5g44ADAEgDe3HnAD0YuAEE4AGzIQSMegE844ALYaFMETyRgRAXwAOAD164gA

💻 Code

When removeComments: false and target: es5, the following code:

const foo = 100;

const getHeight = () =>
  `${
    // A lengthy comment
    foo
  }px`;

generates this output

"use strict";
var foo = 100;
var getHeight = function () {
    return 
    // A lengthy comment
    foo + "px";
};

🙁 Actual behavior

The outputted code is incorrect due to the 'implicit semicolon' immediately after the return. Instead of returning "100px" the generated getHeight function returns undefined and the foo + "px"; statement is unreachable code.

🙂 Expected behavior

I would instead expect the output to be more like this (note additional parentheses).

"use strict";
var foo = 100;
var getHeight = function () {
    return (
    // A lengthy comment
    foo + "px");
};