process: add process.runNextTicks() method

doc/api/deprecations.md

@@ -2466,7 +2466,8 @@ changes:
 Type: Documentation-only (supports [`--pending-deprecation`][])
 
 The `process._tickCallback` property was never documented as
-an officially supported API.
+an officially supported API. Please use `process.runNextTicks`
+instead.
 
 ### DEP0135: `WriteStream.open()` and `ReadStream.open()` are internal
 <!-- YAML

doc/api/process.md

@@ -3005,6 +3005,42 @@ console.log(resourceUsage());
 */
 ```
 
+## `process.runNextTicks()`
+<!-- YAML
+added: REPLACEME
+-->
+
+Ensures all tasks in the V8 micro-task queue have completed. This will cause any
+callback passed to [`process.nextTick()`][], [`queueMicrotask()`][] or to
+[`.then()`][`promise.then()`] or [`.catch()`][`promise.catch()`] of an
+immediately resolving or rejecting promise to be executed.
+
+```mjs
+import { runNextTicks } from 'process';
+
+let value = '';
+
+queueMicrotask(() => {
+  value = 'foo';
+});
+
+runNextTicks();
+
+console.log(value); // 'foo'
+```
+
+```cjs
+let value = '';
+
+queueMicrotask(() => {
+  value = 'foo';
+});
+
+process.runNextTicks();
+
+console.log(value); // 'foo'
+```
+
 ## `process.send(message[, sendHandle[, options]][, callback])`
 <!-- YAML
 added: v0.5.9
@@ -3720,8 +3756,10 @@ cases:
 [`process.hrtime()`]: #processhrtimetime
 [`process.hrtime.bigint()`]: #processhrtimebigint
 [`process.kill()`]: #processkillpid-signal
+[`process.nextTick()`]: #process_nexttick_callback_args
 [`process.setUncaughtExceptionCaptureCallback()`]: #processsetuncaughtexceptioncapturecallbackfn
 [`promise.catch()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/catch
+[`promise.then()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then
 [`queueMicrotask()`]: globals.md#queuemicrotaskcallback
 [`readable.read()`]: stream.md#readablereadsize
 [`require()`]: globals.md#require

lib/internal/bootstrap/node.js

@@ -351,10 +351,9 @@ process.emitWarning = emitWarning;
 {
   const { nextTick, runNextTicks } = setupTaskQueue();
   process.nextTick = nextTick;
-  // Used to emulate a tick manually in the JS land.
-  // A better name for this function would be `runNextTicks` but
-  // it has been exposed to the process object so we keep this legacy name
-  // TODO(joyeecheung): either remove it or make it public
+  process.runNextTicks = runNextTicks;
+
+  // TODO: Deprecate when usage drops
   process._tickCallback = runNextTicks;
 
   const { getTimerCallbacks } = require('internal/timers');