Asynchronous transforms

[aslakhellesoy]

Summary

At our project we frequently need invoke asynchronus functions to create objects:

When('{userName} resolves the conversation', async function (userName) {
  const user = await this.createUser(name) // Would be nice if our custom transform could do that
})

Ideally I'd like to write my transformer like this:

transformLookup.addTransform(new Transform(
    'user',
    User,
    ['[A-Z]\\w+'],
    async userName => ...
))

When('{user} resolves the conversation', async function (user) {
  // The async transform has done the job!
})

This means Cucumber Expressions for JavaScript must also support async transforms (transform functions returning a promise).

[aslakhellesoy]

/cc @jbpros

[aslakhellesoy]

Apart from documenting in the README that the transform function can be asynchronous (return a Promise), no code changes are needed in this library to support this.

The real fix is in cucumber/cucumber-js#753

[lock]

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