fix(core): Use explicit types in configs to ensure valid decorator metadata

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

@@ -4,22 +4,22 @@ import { Config, Env, Nested } from '../decorators';
 class MemoryConfig {
 	/** Max size of memory cache in bytes */
 	@Env('N8N_CACHE_MEMORY_MAX_SIZE')
-	maxSize = 3 * 1024 * 1024; // 3 MiB
+	maxSize: number = 3 * 1024 * 1024; // 3 MiB
 
 	/** Time to live (in milliseconds) for data cached in memory. */
 	@Env('N8N_CACHE_MEMORY_TTL')
-	ttl = 3600 * 1000; // 1 hour
+	ttl: number = 3600 * 1000; // 1 hour
 }
 
 @Config
 class RedisConfig {
 	/** Prefix for cache keys in Redis. */
 	@Env('N8N_CACHE_REDIS_KEY_PREFIX')
-	prefix = 'redis';
+	prefix: string = 'redis';
 
 	/** Time to live (in milliseconds) for data cached in Redis. 0 for no TTL. */
 	@Env('N8N_CACHE_REDIS_TTL')
-	ttl = 3600 * 1000; // 1 hour
+	ttl: number = 3600 * 1000; // 1 hour
 }
 
 @Config

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

@@ -7,18 +7,18 @@ class CredentialsOverwrite {
 	 * Format: { CREDENTIAL_NAME: { PARAMETER: VALUE }}
 	 */
 	@Env('CREDENTIALS_OVERWRITE_DATA')
-	data = '{}';
+	data: string = '{}';
 
 	/** Internal API endpoint to fetch overwritten credential types from. */
 	@Env('CREDENTIALS_OVERWRITE_ENDPOINT')
-	endpoint = '';
+	endpoint: string = '';
 }
 
 @Config
 export class CredentialsConfig {
 	/** Default name for credentials */
 	@Env('CREDENTIALS_DEFAULT_NAME')
-	defaultName = 'My credentials';
+	defaultName: string = 'My credentials';
 
 	@Nested
 	overwrite: CredentialsOverwrite;

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

@@ -4,7 +4,7 @@ import { Config, Env, Nested } from '../decorators';
 class LoggingConfig {
 	/** Whether database logging is enabled. */
 	@Env('DB_LOGGING_ENABLED')
-	enabled = false;
+	enabled: boolean = false;
 
 	/**
 	 * Database logging level. Requires `DB_LOGGING_MAX_EXECUTION_TIME` to be higher than `0`.
@@ -16,7 +16,7 @@ class LoggingConfig {
 	 * Only queries that exceed this time (ms) will be logged. Set `0` to disable.
 	 */
 	@Env('DB_LOGGING_MAX_EXECUTION_TIME')
-	maxQueryExecutionTime = 0;
+	maxQueryExecutionTime: number = 0;
 }
 
 @Config
@@ -26,54 +26,54 @@ class PostgresSSLConfig {
 	 * If `DB_POSTGRESDB_SSL_CA`, `DB_POSTGRESDB_SSL_CERT`, or `DB_POSTGRESDB_SSL_KEY` are defined, `DB_POSTGRESDB_SSL_ENABLED` defaults to `true`.
 	 */
 	@Env('DB_POSTGRESDB_SSL_ENABLED')
-	enabled = false;
+	enabled: boolean = false;
 
 	/** SSL certificate authority */
 	@Env('DB_POSTGRESDB_SSL_CA')
-	ca = '';
+	ca: string = '';
 
 	/** SSL certificate */
 	@Env('DB_POSTGRESDB_SSL_CERT')
-	cert = '';
+	cert: string = '';
 
 	/** SSL key */
 	@Env('DB_POSTGRESDB_SSL_KEY')
-	key = '';
+	key: string = '';
 
 	/** If unauthorized SSL connections should be rejected */
 	@Env('DB_POSTGRESDB_SSL_REJECT_UNAUTHORIZED')
-	rejectUnauthorized = true;
+	rejectUnauthorized: boolean = true;
 }
 
 @Config
 class PostgresConfig {
 	/** Postgres database name */
 	@Env('DB_POSTGRESDB_DATABASE')
-	database = 'n8n';
+	database: string = 'n8n';
 
 	/** Postgres database host */
 	@Env('DB_POSTGRESDB_HOST')
-	host = 'localhost';
+	host: string = 'localhost';
 
 	/** Postgres database password */
 	@Env('DB_POSTGRESDB_PASSWORD')
-	password = '';
+	password: string = '';
 
 	/** Postgres database port */
 	@Env('DB_POSTGRESDB_PORT')
 	port: number = 5432;
 
 	/** Postgres database user */
 	@Env('DB_POSTGRESDB_USER')
-	user = 'postgres';
+	user: string = 'postgres';
 
 	/** Postgres database schema */
 	@Env('DB_POSTGRESDB_SCHEMA')
-	schema = 'public';
+	schema: string = 'public';
 
 	/** Postgres database pool size */
 	@Env('DB_POSTGRESDB_POOL_SIZE')
-	poolSize = 2;
+	poolSize: number = 2;
 
 	@Nested
 	ssl: PostgresSSLConfig;
@@ -83,30 +83,30 @@ class PostgresConfig {
 class MysqlConfig {
 	/** @deprecated MySQL database name */
 	@Env('DB_MYSQLDB_DATABASE')
-	database = 'n8n';
+	database: string = 'n8n';
 
 	/** MySQL database host */
 	@Env('DB_MYSQLDB_HOST')
-	host = 'localhost';
+	host: string = 'localhost';
 
 	/** MySQL database password */
 	@Env('DB_MYSQLDB_PASSWORD')
-	password = '';
+	password: string = '';
 
 	/** MySQL database port */
 	@Env('DB_MYSQLDB_PORT')
 	port: number = 3306;
 
 	/** MySQL database user */
 	@Env('DB_MYSQLDB_USER')
-	user = 'root';
+	user: string = 'root';
 }
 
 @Config
 class SqliteConfig {
 	/** SQLite database file name */
 	@Env('DB_SQLITE_DATABASE')
-	database = 'database.sqlite';
+	database: string = 'database.sqlite';
 
 	/** SQLite database pool size. Set to `0` to disable pooling. */
 	@Env('DB_SQLITE_POOL_SIZE')
@@ -116,15 +116,15 @@ class SqliteConfig {
 	 * Enable SQLite WAL mode.
 	 */
 	@Env('DB_SQLITE_ENABLE_WAL')
-	enableWAL = this.poolSize > 1;
+	enableWAL: boolean = this.poolSize > 1;
 
 	/**
 	 * Run `VACUUM` on startup to rebuild the database, reducing file size and optimizing indexes.
 	 *
 	 * @warning Long-running blocking operation that will increase startup time.
 	 */
 	@Env('DB_SQLITE_VACUUM_ON_STARTUP')
-	executeVacuumOnStartup = false;
+	executeVacuumOnStartup: boolean = false;
 }
 
 @Config
@@ -135,7 +135,7 @@ export class DatabaseConfig {
 
 	/** Prefix for table names */
 	@Env('DB_TABLE_PREFIX')
-	tablePrefix = '';
+	tablePrefix: string = '';
 
 	@Nested
 	logging: LoggingConfig;

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

@@ -4,51 +4,51 @@ import { Config, Env, Nested } from '../decorators';
 class PrometheusMetricsConfig {
 	/** Whether to enable the `/metrics` endpoint to expose Prometheus metrics. */
 	@Env('N8N_METRICS')
-	enable = false;
+	enable: boolean = false;
 
 	/** Prefix for Prometheus metric names. */
 	@Env('N8N_METRICS_PREFIX')
-	prefix = 'n8n_';
+	prefix: string = 'n8n_';
 
 	/** Whether to expose system and Node.js metrics. See: https://www.npmjs.com/package/prom-client */
 	@Env('N8N_METRICS_INCLUDE_DEFAULT_METRICS')
-	includeDefaultMetrics = true;
+	includeDefaultMetrics: boolean = true;
 
 	/** Whether to include a label for workflow ID on workflow metrics. */
 	@Env('N8N_METRICS_INCLUDE_WORKFLOW_ID_LABEL')
-	includeWorkflowIdLabel = false;
+	includeWorkflowIdLabel: boolean = false;
 
 	/** Whether to include a label for node type on node metrics. */
 	@Env('N8N_METRICS_INCLUDE_NODE_TYPE_LABEL')
-	includeNodeTypeLabel = false;
+	includeNodeTypeLabel: boolean = false;
 
 	/** Whether to include a label for credential type on credential metrics. */
 	@Env('N8N_METRICS_INCLUDE_CREDENTIAL_TYPE_LABEL')
-	includeCredentialTypeLabel = false;
+	includeCredentialTypeLabel: boolean = false;
 
 	/** Whether to expose metrics for API endpoints. See: https://www.npmjs.com/package/express-prom-bundle */
 	@Env('N8N_METRICS_INCLUDE_API_ENDPOINTS')
-	includeApiEndpoints = false;
+	includeApiEndpoints: boolean = false;
 
 	/** Whether to include a label for the path of API endpoint calls. */
 	@Env('N8N_METRICS_INCLUDE_API_PATH_LABEL')
-	includeApiPathLabel = false;
+	includeApiPathLabel: boolean = false;
 
 	/** Whether to include a label for the HTTP method of API endpoint calls. */
 	@Env('N8N_METRICS_INCLUDE_API_METHOD_LABEL')
-	includeApiMethodLabel = false;
+	includeApiMethodLabel: boolean = false;
 
 	/** Whether to include a label for the status code of API endpoint calls. */
 	@Env('N8N_METRICS_INCLUDE_API_STATUS_CODE_LABEL')
-	includeApiStatusCodeLabel = false;
+	includeApiStatusCodeLabel: boolean = false;
 
 	/** Whether to include metrics for cache hits and misses. */
 	@Env('N8N_METRICS_INCLUDE_CACHE_METRICS')
-	includeCacheMetrics = false;
+	includeCacheMetrics: boolean = false;
 
 	/** Whether to include metrics derived from n8n's internal events */
 	@Env('N8N_METRICS_INCLUDE_MESSAGE_EVENT_BUS_METRICS')
-	includeMessageEventBusMetrics = false;
+	includeMessageEventBusMetrics: boolean = false;
 }
 
 @Config
@@ -62,41 +62,41 @@ export class EndpointsConfig {
 
 	/** Path segment for REST API endpoints. */
 	@Env('N8N_ENDPOINT_REST')
-	rest = 'rest';
+	rest: string = 'rest';
 
 	/** Path segment for form endpoints. */
 	@Env('N8N_ENDPOINT_FORM')
-	form = 'form';
+	form: string = 'form';
 
 	/** Path segment for test form endpoints. */
 	@Env('N8N_ENDPOINT_FORM_TEST')
-	formTest = 'form-test';
+	formTest: string = 'form-test';
 
 	/** Path segment for waiting form endpoints. */
 	@Env('N8N_ENDPOINT_FORM_WAIT')
-	formWaiting = 'form-waiting';
+	formWaiting: string = 'form-waiting';
 
 	/** Path segment for webhook endpoints. */
 	@Env('N8N_ENDPOINT_WEBHOOK')
-	webhook = 'webhook';
+	webhook: string = 'webhook';
 
 	/** Path segment for test webhook endpoints. */
 	@Env('N8N_ENDPOINT_WEBHOOK_TEST')
-	webhookTest = 'webhook-test';
+	webhookTest: string = 'webhook-test';
 
 	/** Path segment for waiting webhook endpoints. */
 	@Env('N8N_ENDPOINT_WEBHOOK_WAIT')
-	webhookWaiting = 'webhook-waiting';
+	webhookWaiting: string = 'webhook-waiting';
 
 	/** Whether to disable n8n's UI (frontend). */
 	@Env('N8N_DISABLE_UI')
-	disableUi = false;
+	disableUi: boolean = false;
 
 	/** Whether to disable production webhooks on the main process, when using webhook-specific processes. */
 	@Env('N8N_DISABLE_PRODUCTION_MAIN_PROCESS')
-	disableProductionWebhooksOnMainProcess = false;
+	disableProductionWebhooksOnMainProcess: boolean = false;
 
 	/** Colon-delimited list of additional endpoints to not open the UI on. */
 	@Env('N8N_ADDITIONAL_NON_UI_ROUTES')
-	additionalNonUIRoutes = '';
+	additionalNonUIRoutes: string = '';
 }

packages/@n8n/config/src/configs/event-bus.config.ts

@@ -4,22 +4,22 @@ import { Config, Env, Nested } from '../decorators';
 class LogWriterConfig {
 	/* of event log files to keep */
 	@Env('N8N_EVENTBUS_LOGWRITER_KEEPLOGCOUNT')
-	keepLogCount = 3;
+	keepLogCount: number = 3;
 
 	/** Max size (in KB) of an event log file before a new one is started */
 	@Env('N8N_EVENTBUS_LOGWRITER_MAXFILESIZEINKB')
-	maxFileSizeInKB = 10240; // 10 MB
+	maxFileSizeInKB: number = 10240; // 10 MB
 
 	/** Basename of event log file */
 	@Env('N8N_EVENTBUS_LOGWRITER_LOGBASENAME')
-	logBaseName = 'n8nEventLog';
+	logBaseName: string = 'n8nEventLog';
 }
 
 @Config
 export class EventBusConfig {
 	/** How often (in ms) to check for unsent event messages. Can in rare cases cause a message to be sent twice. `0` to disable */
 	@Env('N8N_EVENTBUS_CHECKUNSENTINTERVAL')
-	checkUnsentInterval = 0;
+	checkUnsentInterval: number = 0;
 
 	/** Endpoint to retrieve n8n version information from */
 	@Nested

packages/@n8n/config/src/configs/external-secrets.config.ts

@@ -4,9 +4,9 @@ import { Config, Env } from '../decorators';
 export class ExternalSecretsConfig {
 	/** How often (in seconds) to check for secret updates */
 	@Env('N8N_EXTERNAL_SECRETS_UPDATE_INTERVAL')
-	updateInterval = 300;
+	updateInterval: number = 300;
 
 	/** Whether to prefer GET over LIST when fetching secrets from Hashicorp Vault */
 	@Env('N8N_EXTERNAL_SECRETS_PREFER_GET')
-	preferGet = false;
+	preferGet: boolean = false;
 }

packages/@n8n/config/src/configs/external-storage.config.ts

@@ -4,29 +4,29 @@ import { Config, Env, Nested } from '../decorators';
 class S3BucketConfig {
 	/** Name of the n8n bucket in S3-compatible external storage */
 	@Env('N8N_EXTERNAL_STORAGE_S3_BUCKET_NAME')
-	name = '';
+	name: string = '';
 
 	/** Region of the n8n bucket in S3-compatible external storage @example "us-east-1" */
 	@Env('N8N_EXTERNAL_STORAGE_S3_BUCKET_REGION')
-	region = '';
+	region: string = '';
 }
 
 @Config
 class S3CredentialsConfig {
 	/** Access key in S3-compatible external storage */
 	@Env('N8N_EXTERNAL_STORAGE_S3_ACCESS_KEY')
-	accessKey = '';
+	accessKey: string = '';
 
 	/** Access secret in S3-compatible external storage */
 	@Env('N8N_EXTERNAL_STORAGE_S3_ACCESS_SECRET')
-	accessSecret = '';
+	accessSecret: string = '';
 }
 
 @Config
 class S3Config {
 	/** Host of the n8n bucket in S3-compatible external storage @example "s3.us-east-1.amazonaws.com" */
 	@Env('N8N_EXTERNAL_STORAGE_S3_HOST')
-	host = '';
+	host: string = '';
 
 	@Nested
 	bucket: S3BucketConfig;

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

@@ -47,7 +47,7 @@ export class NodesConfig {
 
 	/** Node type to use as error trigger */
 	@Env('NODES_ERROR_TRIGGER_TYPE')
-	errorTriggerType = 'n8n-nodes-base.errorTrigger';
+	errorTriggerType: string = 'n8n-nodes-base.errorTrigger';
 
 	@Nested
 	communityPackages: CommunityPackagesConfig;