Head comments are removed in some cases for next `import` line

name: Bug
about: Create a report to help us improve TypeScript
title: 'Head comments are removed in some cases'
labels: ''
assignees: ''

TypeScript Version: 3.7.x-dev.201xxxxx

There is a repo, the same result for 3.6 and latest next 4.0...

Search Terms:

Code

// @some-comment
import { A } from "./mod";

const a: A = {};

Repro repo: https://github.com/whitecolor/ts-remove-comment-import

Expected behavior:

Comments is not removed

"use strict";
// @some-comment
Object.defineProperty(exports, "__esModule", { value: true });
var a = {};

Actual behavior:

Head comments are removed in some cases for next import line. Produced output:

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var a = {};

Playground Link:

No.

Related Issues:

Yes. There were a few alike issues before.

Use the reproduction repository linked in the issue and compile the shown TypeScript example with the affected TypeScript versions. Compare the emitted JavaScript with the expected output, focusing on preservation of the head comment before the import. Done means the comment remains in the generated output for the reported cases and existing related behavior is not regressed.