Dev version based on time

tasks/next-dev-version.js

@@ -0,0 +1,14 @@
+const version = require('../package.json').version;
+const semver = require('semver');
+
+function nextVersion() {
+  const s = semver.parse(version);
+  if (!s) {
+    throw new Error(`Invalid version ${version}`);
+  }
+  return `${s.major}.${s.minor}.${s.patch}-dev.${Date.now()}`;
+}
+
+if (require.main === module) {
+  process.stdout.write(`${nextVersion()}\n`);
+}