Failure to escape JavaScript keywords like "true", "false", and "null" in module names

[henrichen]

Dart version: Dart VM version: 2.6.1 (Mon Nov 11 13:12:24 2019 +0100) on "macos_x64"

I have dart files named true.dart, false.dart, and if.dart, etc. and import them in my another file, say, abc.dart.
I am writing a web application which use abc.dart and I test it using
"pub run build_runner serve test:8081 -c myweb"

And it complains in chrome developer console when visit my web application http://localhost:8081/myweb/index.html

In the generated abc.ddc.js file, I saw following generated codes, and it complains :
Uncaught SyntaxError: Unexpected token 'true'

 ...
  const true = Object.create(dart.library);
  const $if = Object.create(dart.library);
  const false = Object.create(dart.library);
 ...

It seems Dart codegen tool fail to escape keywords true and false but does escape the keyword if with a prefix $ sign and generate const $if . I am not sure if there are still other keywords that are not escaped when doing codegen.

I can workaround this issue by rename my true.dart file to another name, say mytrue.dart.