initial

node_modules/onoff/examples/wait-for-interrupt.js

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+"use strict";
+
+const Gpio = require('../onoff').Gpio; // Gpio class
+
+// Export GPIO4 as an interrupt generating input with a debounceTimeout of 10
+// milliseconds
+const button = new Gpio(4, 'in', 'rising', {debounceTimeout: 10});
+
+console.log('Please press the button on GPIO4...');
+
+// The callback passed to watch will be invoked when the button connected to
+// GPIO4 is pressed
+button.watch(function (err, value) {
+  if (err) {
+    throw err;
+  }
+
+  console.log('Button pressed!, its value was ' + value);
+
+  button.unexport(); // Unexport GPIO and free resources
+});
+