How to use the gherkin.fromSources function in gherkin
To help you get started, we’ve selected a few gherkin examples, based on popular ways it is used in public projects.
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cucumber / cucumber-js / test / gherkin_helpers.js View on Github 
return new Promise((resolve, reject) => {
let source
let gherkinDocument
const pickles = []
const envelopes = []
const messageStream = Gherkin.fromSources(sources)
messageStream.on('data', envelope => {
envelopes.push(envelope)
if (envelope.source) {
source = envelope.source
}
if (envelope.gherkinDocument) {
gherkinDocument = envelope.gherkinDocument
}
if (envelope.pickle) {
pickles.push(envelope.pickle)
envelopes.push(
messages.Envelope.fromObject({
pickleAccepted: { pickleId: envelope.pickle.id },
})
)
}
