Error when trying to use selfContained optional transform

I’m attempting to use experimental features (specifically async-await) without explicitly importing the regenerator runtime. Using 6to5ify v3.1.2 and going by the 6to5 docs, I expect the following to do the job:

var b = browserify(options)
        .transform(to5ify.configure({
            experimental: true,
            optional: ['selfContained']
        }))
        .require(devPath, {entry: true});

However, 6to5ify throws a wobbly about the transformer:

ReferenceError: unknown transformer selfContained specified in optional while parsing file: /Users/marke/some-project/frontend/scripts/main.js
    at Function.transform._ensureTransformerNames (/Users/marke/some-project/node_modules/6to5ify/node_modules/6to5-core/lib/6to5/transformation/transform.js:28:13)
    at Function.File.normaliseOptions (/Users/marke/some-project/node_modules/6to5ify/node_modules/6to5-core/lib/6to5/file.js:125:13)
    at new File (/Users/marke/some-project/node_modules/6to5ify/node_modules/6to5-core/lib/6to5/file.js:17:32)
    at Object.transform (/Users/marke/some-project/node_modules/6to5ify/node_modules/6to5-core/lib/6to5/transformation/transform.js:11:14)
    at Stream.end (/Users/marke/some-project/node_modules/6to5ify/index.js:39:23)
    at _end (/Users/marke/some-project/node_modules/6to5ify/node_modules/through/index.js:65:9)
    at Stream.stream.end (/Users/marke/some-project/node_modules/6to5ify/node_modules/through/index.js:74:5)
    at Transform.onend (/Users/marke/some-project/node_modules/browserify/node_modules/readable-stream/lib/_stream_readable.js:523:10)
    at Transform.g (events.js:180:16)
    at Transform.emit (events.js:117:20)

[craigdallimore]

I’ve found that using the regeneratorRuntime with babelify is now achieved like so:

var b = browserify(options)
        .transform(babelify.configure({
            optional: ['runtime']
        }))

note: you will need babel-runtime for this.

[sebmck]

@craigdallimore Yeah, I recently renamed the selfContained transformer to the more descriptive runtime. You can find out more via the docs.