Revert "Remove unused task.js"

This reverts commit 2945572.

tools/task.js

@@ -0,0 +1,23 @@
+/* eslint-env node */
+// https://medium.com/@tarkus/build-automation-with-vanilla-javascript-74639ec98bad
+function run(task, action, ...args) {
+ const command = process.argv[2]
+ const taskName =
+ command && !command.startsWith('-') ? `${task} ${command}` : task
+ const start = new Date()
+ process.stdout.write(`Starting '${taskName}'...\n`)
+ return Promise.resolve()
+ .then(() => action(...args))
+ .then(
+ () => {
+ process.stdout.write(
+ `Finished '${taskName}' after ${new Date().getTime() -
+ start.getTime()}ms\n`
+ )
+ },
+ err => process.stderr.write(`${err.stack}\n`)
+ )
+}
+
+process.nextTick(() => require.main.exports())
+module.exports = (task, action) => run.bind(undefined, task, action)