chore(no-story): add script to display commands for a given evergreen…

… task (#3731)

etc/expand-tasks.mjs

@@ -0,0 +1,34 @@
+// usage: node expand-task.js <task name>
+// must be run from root of the Node driver
+//
+// The output is pipeable: `node expand-task.js <task name> | jq '.'`
+
+import { readFileSync } from 'fs';
+import { load } from 'js-yaml';
+import { gte } from 'semver';
+import { Readable } from 'stream';
+import { inspect } from 'util';
+
+if (!gte(process.version, '16.0.0')) {
+  console.error('expand-tasks.mjs requires Node16+');
+  process.exit(1);
+}
+
+const config = load(readFileSync('.evergreen/config.yml'));
+const taskName = (process.argv[2] ?? '').trim();
+
+const task = config.tasks.find(({ name }) => name === taskName);
+
+if (!task) {
+  process.exit();
+}
+
+const commands = task.commands.flatMap(({ func }) => config.functions[func]);
+
+if (process.stdout.isTTY) {
+  console.log(inspect(commands, { depth: Infinity, colors: true }));
+} else {
+  Readable.from(commands)
+    .map(command => JSON.stringify(command))
+    .pipe(process.stdout);
+}