In-memory buildstatic issue

const gulp = require('gulp');
const Builder = require('systemjs-builder');

const builder = new Builder();
build.config(config);

function build(done) {
  return builder.buildStatic('path/to/entry', {}).then((output) => {
    console.log(output.source);
    done();
  })
}

gulp.watch(cwd, {
  options,
}, gulp.series(
  task1,
  task2,
  build,
));

The bundled file as output.source is not updated as source code changes. Only creating a new builder resolves the issue. I'm not sure it is a issue or by design.

systemjs / builder

In-memory buildstatic issue #862