Initial commit

themes/keepit/node_modules/stream-transform/samples/state.handler.js

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+
+const transform = require('..')
+const assert = require('assert')
+// Generate a dataset of 5 records
+const records = 'record\n'.repeat(5).trim().split('\n')
+let test_running = records.length
+let test_started = records.length
+let test_finished = 0
+// Execute the transformation
+transform(records, function(record, callback){
+  setTimeout( () => {
+    const {running, started, finished} = this
+    assert.equal(running, test_running--)
+    assert.equal(started, test_started)
+    assert.equal(finished, test_finished++)
+    callback(null, `${running}_${started}_${finished}\n`)
+  }, 100)
+})
+// Get notify on error
+.on('end', function(){
+  process.stdout.write('-------\n')
+  const {running, started, finished} = this
+  process.stdout.write(`${running}_${started}_${finished}\n`)
+})
+// Print the transformed records to the standard output
+.pipe(process.stdout)