this.warn and this.error are not available in transformBundle

[Pauan]

Here is an example Rollup config:

export default {
  entry: "foo.js",
  format: "es",
  plugins: [
    {
      transformBundle: function (source) {
        console.log(this.warn);
        console.log(this.error);
      }
    }
  ]
};

And here is foo.js:

console.log(1);

Both this.warn and this.error are undefined, but they should be defined.

[olsonpm]

per the wiki

Inside a transform function, you can use this.warn(warning[, pos]) to provide feedback in a standard form.

transformBundle doesn't have a note about this.warn

[Pauan]

@olsonpm I am aware. I am requesting that it be added to transformBundle as well.

[olsonpm]

Ah I misunderstood

[olsonpm]

Btw - I just came across this issue in my plugin (wanted this.warn inside the resolveId function). I looked at the warn code in rollup and it's very coupled to the transform function. Because of that, the quickest solution is to just provide your own onwarn plugin option.

It's a workaround, not a solution - but it worksaround well enough for me

[guybedford]

These are now available for plugins in #2208.