refactor(core): Overhaul commands setup. Add support for module commands (#16709)

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

packages/cli/src/commands/start.ts

@@ -2,8 +2,8 @@
 /* eslint-disable @typescript-eslint/no-unsafe-member-access */
 import { LICENSE_FEATURES } from '@n8n/constants';
 import { ExecutionRepository, SettingsRepository } from '@n8n/db';
+import { Command } from '@n8n/decorators';
 import { Container } from '@n8n/di';
-import { Flags } from '@oclif/core';
 import glob from 'fast-glob';
 import { createReadStream, createWriteStream, existsSync } from 'fs';
 import { mkdir } from 'fs/promises';
@@ -11,6 +11,7 @@ import { jsonParse, randomString, type IWorkflowExecutionDataProcess } from 'n8n
 import path from 'path';
 import replaceStream from 'replacestream';
 import { pipeline } from 'stream/promises';
+import { z } from 'zod';
 
 import { ActiveExecutions } from '@/active-executions';
 import { ActiveWorkflowManager } from '@/active-workflow-manager';
@@ -36,32 +37,29 @@ import { BaseCommand } from './base-command';
 // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-var-requires
 const open = require('open');
 
-export class Start extends BaseCommand {
-	static description = 'Starts n8n. Makes Web-UI available and starts active workflows';
-
-	static examples = [
-		'$ n8n start',
-		'$ n8n start --tunnel',
-		'$ n8n start -o',
-		'$ n8n start --tunnel -o',
-	];
-
-	static flags = {
-		help: Flags.help({ char: 'h' }),
-		open: Flags.boolean({
-			char: 'o',
-			description: 'opens the UI automatically in browser',
-		}),
-		tunnel: Flags.boolean({
-			description:
-				'runs the webhooks via a hooks.n8n.cloud tunnel server. Use only for testing and development!',
-		}),
-		reinstallMissingPackages: Flags.boolean({
-			description:
-				'Attempts to self heal n8n if packages with nodes are missing. Might drastically increase startup times.',
-		}),
-	};
+const flagsSchema = z.object({
+	open: z.boolean().alias('o').describe('opens the UI automatically in browser').optional(),
+	tunnel: z
+		.boolean()
+		.describe(
+			'runs the webhooks via a hooks.n8n.cloud tunnel server. Use only for testing and development!',
+		)
+		.optional(),
+	reinstallMissingPackages: z
+		.boolean()
+		.describe(
+			'Attempts to self heal n8n if packages with nodes are missing. Might drastically increase startup times.',
+		)
+		.optional(),
+});
 
+@Command({
+	name: 'start',
+	description: 'Starts n8n. Makes Web-UI available and starts active workflows',
+	examples: ['', '--tunnel', '-o', '--tunnel -o'],
+	flagsSchema,
+})
+export class Start extends BaseCommand<z.infer<typeof flagsSchema>> {
 	protected activeWorkflowManager: ActiveWorkflowManager;
 
 	protected server = Container.get(Server);
@@ -181,7 +179,7 @@ export class Start extends BaseCommand {
 			scopedLogger.debug(`Host ID: ${this.instanceSettings.hostId}`);
 		}
 
-		const { flags } = await this.parse(Start);
+		const { flags } = this;
 		const { communityPackages } = this.globalConfig.nodes;
 		// cli flag overrides the config env variable
 		if (flags.reinstallMissingPackages) {
@@ -272,7 +270,7 @@ export class Start extends BaseCommand {
 	}
 
 	async run() {
-		const { flags } = await this.parse(Start);
+		const { flags } = this;
 
 		// Load settings from database and set them to config.
 		const databaseSettings = await Container.get(SettingsRepository).findBy({