Allow comments in tsconfig.json

[js3692]

It seems like comments cannot be used currently (i.e. input is expected to be a "valid" JSON), looking at (in this file):

function convertCompilerOptionsOrThrow(options) {
  if (!options) return null;

  var result = ts.convertCompilerOptionsFromJson(options, '');

  if (result.errors && result.errors.length) {
    throw new Error(result.errors[0].messageText);
  }

  return result.options;
}

Looking at this example, I think the parseConfigFileTextToJson function might be useful here to allow comments inside tsconfig.json.

Do you have any advice on how to enable comments in the config file? Happy to open a PR in the compiler repo.

[yorrd]

you could just regex the comments out before handing it over to the typescript API. Feel free to open a PR, will gladly accept

[nicu-chiciuc]

I don't think allowing comments inside JSON files is a good idea, even though it might be helpful. Ditching the official standard just so that we have some local improvements is usually a bad idea.

[colelawrence]

@nicu-chiciuc the official tsc is tolerant of comments.
So, jsonc support is the standard for tsconfig.json files.