Strip-comments strips source code for some files #75
Description
Describe the bug
We use strip-comments to strip comments from downleveled .d.ts files in AWS SDK for JavaScript (v3).
We noticed that in some cases, it strips the source code.
Steps to reproduce
Follow README from https://github.com/trivikr/strip-comments-test
Observed behavior
The Wisdom.output.d.ts file has source code stripped.
Expected behavior
The Wisdom.output.d.ts file only has comments stripped.
Additional context
Bug report on AWS SDK for JavaScript (v3) aws/aws-sdk-js-v3#3847