refactor(core): Port nodes config (no-changelog) (#10140)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/@n8n/config/src/configs/nodes.ts

@@ -0,0 +1,46 @@
+import { Config, Env, Nested } from '../decorators';
+
+function isStringArray(input: unknown): input is string[] {
+	return Array.isArray(input) && input.every((item) => typeof item === 'string');
+}
+
+class JsonStringArray extends Array<string> {
+	constructor(str: string) {
+		super();
+
+		let parsed: unknown;
+
+		try {
+			parsed = JSON.parse(str);
+		} catch {
+			return [];
+		}
+
+		return isStringArray(parsed) ? parsed : [];
+	}
+}
+
+@Config
+class CommunityPackagesConfig {
+	/** Whether to enable community packages */
+	@Env('N8N_COMMUNITY_PACKAGES_ENABLED')
+	enabled: boolean = true;
+}
+
+@Config
+export class NodesConfig {
+	/** Node types to load. Includes all if unspecified. @example '["n8n-nodes-base.hackerNews"]' */
+	@Env('NODES_INCLUDE')
+	readonly include: JsonStringArray = [];
+
+	/** Node types not to load. Excludes none if unspecified. @example '["n8n-nodes-base.hackerNews"]' */
+	@Env('NODES_EXCLUDE')
+	readonly exclude: JsonStringArray = [];
+
+	/** Node type to use as error trigger */
+	@Env('NODES_ERROR_TRIGGER_TYPE')
+	readonly errorTriggerType: string = 'n8n-nodes-base.errorTrigger';
+
+	@Nested
+	readonly communityPackages: CommunityPackagesConfig;
+}

packages/@n8n/config/src/decorators.ts

@@ -4,6 +4,7 @@ import { Container, Service } from 'typedi';
 
 // eslint-disable-next-line @typescript-eslint/ban-types
 type Class = Function;
+type Constructable<T = unknown> = new (rawValue: string) => T;
 type PropertyKey = string | symbol;
 interface PropertyMetadata {
 	type: unknown;
@@ -46,6 +47,8 @@ export const Config: ClassDecorator = (ConfigClass: Class) => {
 					} else {
 						value = value === 'true';
 					}
+				} else if (type !== String && type !== Object) {
+					value = new (type as Constructable)(value as string);
 				}
 
 				if (value !== undefined) {

packages/@n8n/config/src/index.ts

@@ -7,6 +7,7 @@ import { PublicApiConfig } from './configs/public-api';
 import { ExternalSecretsConfig } from './configs/external-secrets';
 import { TemplatesConfig } from './configs/templates';
 import { EventBusConfig } from './configs/event-bus';
+import { NodesConfig } from './configs/nodes';
 
 @Config
 class UserManagementConfig {
@@ -39,4 +40,7 @@ export class GlobalConfig {
 
 	@Nested
 	eventBus: EventBusConfig;
+
+	@Nested
+	readonly nodes: NodesConfig;
 }