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packages/@n8n/constants/eslint.config.mjs

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+import { defineConfig } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+
+export default defineConfig(baseConfig, {
+	rules: {
+		'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+	},
+});

packages/@n8n/constants/package.json

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+{
+  "name": "@n8n/constants",
+  "version": "0.19.0",
+  "scripts": {
+    "clean": "rimraf dist .turbo",
+    "dev": "pnpm watch",
+    "typecheck": "tsc --noEmit",
+    "build": "tsc -p tsconfig.build.json",
+    "format": "biome format --write .",
+    "format:check": "biome ci .",
+    "lint": "eslint . --quiet",
+    "lint:fix": "eslint . --fix",
+    "watch": "tsc -p tsconfig.build.json --watch"
+  },
+  "main": "dist/index.js",
+  "module": "src/index.ts",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist/**/*"
+  ],
+  "devDependencies": {
+    "@n8n/typescript-config": "workspace:*"
+  }
+}

packages/@n8n/constants/src/api.ts

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+export const N8N_IO_BASE_URL = 'https://api.n8n.io/api/';

packages/@n8n/constants/src/browser.ts

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+export const BROWSER_ID_STORAGE_KEY = 'n8n-browserId';

packages/@n8n/constants/src/community-nodes.ts

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+export const NPM_COMMUNITY_NODE_SEARCH_API_URL = 'https://api.npms.io/v2/';

packages/@n8n/constants/src/execution.ts

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+export const TOOL_EXECUTOR_NODE_NAME = 'PartialExecutionToolExecutor';

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

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+export * from './api';
+export * from './browser';
+export * from './community-nodes';
+export * from './instance';
+export * from './execution';
+export * from './logstreaming';
+
+export const LICENSE_FEATURES = {
+	SHARING: 'feat:sharing',
+	LDAP: 'feat:ldap',
+	SAML: 'feat:saml',
+	OIDC: 'feat:oidc',
+	MFA_ENFORCEMENT: 'feat:mfaEnforcement',
+	LOG_STREAMING: 'feat:logStreaming',
+	ADVANCED_EXECUTION_FILTERS: 'feat:advancedExecutionFilters',
+	VARIABLES: 'feat:variables',
+	SOURCE_CONTROL: 'feat:sourceControl',
+	API_DISABLED: 'feat:apiDisabled',
+	EXTERNAL_SECRETS: 'feat:externalSecrets',
+	SHOW_NON_PROD_BANNER: 'feat:showNonProdBanner',
+	DEBUG_IN_EDITOR: 'feat:debugInEditor',
+	BINARY_DATA_S3: 'feat:binaryDataS3',
+	MULTIPLE_MAIN_INSTANCES: 'feat:multipleMainInstances',
+	WORKER_VIEW: 'feat:workerView',
+	ADVANCED_PERMISSIONS: 'feat:advancedPermissions',
+	PROJECT_ROLE_ADMIN: 'feat:projectRole:admin',
+	PROJECT_ROLE_EDITOR: 'feat:projectRole:editor',
+	PROJECT_ROLE_VIEWER: 'feat:projectRole:viewer',
+	AI_ASSISTANT: 'feat:aiAssistant',
+	ASK_AI: 'feat:askAi',
+	COMMUNITY_NODES_CUSTOM_REGISTRY: 'feat:communityNodes:customRegistry',
+	AI_CREDITS: 'feat:aiCredits',
+	FOLDERS: 'feat:folders',
+	INSIGHTS_VIEW_SUMMARY: 'feat:insights:viewSummary',
+	INSIGHTS_VIEW_DASHBOARD: 'feat:insights:viewDashboard',
+	INSIGHTS_VIEW_HOURLY_DATA: 'feat:insights:viewHourlyData',
+	API_KEY_SCOPES: 'feat:apiKeyScopes',
+	WORKFLOW_DIFFS: 'feat:workflowDiffs',
+	NAMED_VERSIONS: 'feat:namedVersions',
+	CUSTOM_ROLES: 'feat:customRoles',
+	AI_BUILDER: 'feat:aiBuilder',
+	DYNAMIC_CREDENTIALS: 'feat:dynamicCredentials',
+	PERSONAL_SPACE_POLICY: 'feat:personalSpacePolicy',
+} as const;
+
+export const LICENSE_QUOTAS = {
+	TRIGGER_LIMIT: 'quota:activeWorkflows',
+	VARIABLES_LIMIT: 'quota:maxVariables',
+	USERS_LIMIT: 'quota:users',
+	WORKFLOW_HISTORY_PRUNE_LIMIT: 'quota:workflowHistoryPrune',
+	TEAM_PROJECT_LIMIT: 'quota:maxTeamProjects',
+	AI_CREDITS: 'quota:aiCredits',
+	INSIGHTS_MAX_HISTORY_DAYS: 'quota:insights:maxHistoryDays',
+	INSIGHTS_RETENTION_MAX_AGE_DAYS: 'quota:insights:retention:maxAgeDays',
+	INSIGHTS_RETENTION_PRUNE_INTERVAL_DAYS: 'quota:insights:retention:pruneIntervalDays',
+	WORKFLOWS_WITH_EVALUATION_LIMIT: 'quota:evaluations:maxWorkflows',
+} as const;
+
+export const UNLIMITED_LICENSE_QUOTA = -1;
+export const DEFAULT_WORKFLOW_HISTORY_PRUNE_LIMIT = 24;
+
+export type BooleanLicenseFeature = (typeof LICENSE_FEATURES)[keyof typeof LICENSE_FEATURES];
+export type NumericLicenseFeature = (typeof LICENSE_QUOTAS)[keyof typeof LICENSE_QUOTAS];
+
+export const LDAP_FEATURE_NAME = 'features.ldap';
+
+export type ConnectionSecurity = 'none' | 'tls' | 'startTls';
+
+export interface LdapConfig {
+	loginEnabled: boolean;
+	loginLabel: string;
+	connectionUrl: string;
+	allowUnauthorizedCerts: boolean;
+	connectionSecurity: ConnectionSecurity;
+	connectionPort: number;
+	baseDn: string;
+	bindingAdminDn: string;
+	bindingAdminPassword: string;
+	firstNameAttribute: string;
+	lastNameAttribute: string;
+	emailAttribute: string;
+	loginIdAttribute: string;
+	ldapIdAttribute: string;
+	userFilter: string;
+	synchronizationEnabled: boolean;
+	synchronizationInterval: number; // minutes
+	searchPageSize: number;
+	searchTimeout: number;
+	/**
+	 * Enforce email uniqueness in LDAP directory.
+	 * When enabled, blocks login if multiple LDAP accounts share the same email.
+	 * Prevents privilege escalation via email-based account linking.
+	 */
+	enforceEmailUniqueness: boolean;
+}
+
+export const LDAP_DEFAULT_CONFIGURATION: LdapConfig = {
+	loginEnabled: false,
+	loginLabel: '',
+	connectionUrl: '',
+	allowUnauthorizedCerts: false,
+	connectionSecurity: 'none',
+	connectionPort: 389,
+	baseDn: '',
+	bindingAdminDn: '',
+	bindingAdminPassword: '',
+	firstNameAttribute: '',
+	lastNameAttribute: '',
+	emailAttribute: '',
+	loginIdAttribute: '',
+	ldapIdAttribute: '',
+	userFilter: '',
+	synchronizationEnabled: false,
+	synchronizationInterval: 60,
+	searchPageSize: 0,
+	searchTimeout: 60,
+	enforceEmailUniqueness: true,
+};
+
+export { Time } from './time';
+
+export const MIN_PASSWORD_CHAR_LENGTH = 8;
+
+export const MAX_PASSWORD_CHAR_LENGTH = 64;
+
+/**
+ * Character set used for generating nanoid IDs across n8n.
+ * Includes digits (0-9), uppercase letters (A-Z), and lowercase letters (a-z).
+ */
+export const NANOID_ALPHABET = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

packages/@n8n/constants/src/instance.ts

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+export const INSTANCE_ID_HEADER = 'n8n-instance-id';
+export const INSTANCE_VERSION_HEADER = 'n8n-version';
+
+export const INSTANCE_TYPES = ['main', 'webhook', 'worker'] as const;
+export type InstanceType = (typeof INSTANCE_TYPES)[number];
+
+export const INSTANCE_ROLES = ['unset', 'leader', 'follower'] as const;
+export type InstanceRole = (typeof INSTANCE_ROLES)[number];

packages/@n8n/constants/src/logstreaming.ts

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+import { Time } from './time';
+
+export const LOGSTREAMING_DEFAULT_MAX_FREE_SOCKETS = 5;
+export const LOGSTREAMING_DEFAULT_MAX_SOCKETS = 50;
+export const LOGSTREAMING_DEFAULT_MAX_TOTAL_SOCKETS = 100;
+export const LOGSTREAMING_DEFAULT_SOCKET_TIMEOUT_MS = 5 * Time.seconds.toMilliseconds;
+
+export const LOGSTREAMING_CB_DEFAULT_MAX_DURATION_MS = 3 * Time.minutes.toMilliseconds;
+export const LOGSTREAMING_CB_DEFAULT_MAX_FAILURES = 5;
+export const LOGSTREAMING_CB_DEFAULT_HALF_OPEN_REQUESTS = 2;
+export const LOGSTREAMING_CB_DEFAULT_FAILURE_WINDOW_MS = 1 * Time.minutes.toMilliseconds;
+export const LOGSTREAMING_CB_DEFAULT_CONCURRENT_HALF_OPEN_REQUESTS = 1;

packages/@n8n/constants/src/time.ts

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+/**
+ * Convert time from any time unit to any other unit
+ */
+export const Time = {
+	milliseconds: {
+		toHours: 1 / (60 * 60 * 1000),
+		toMinutes: 1 / (60 * 1000),
+		toSeconds: 1 / 1000,
+	},
+	seconds: {
+		toMilliseconds: 1000,
+	},
+	minutes: {
+		toMilliseconds: 60 * 1000,
+	},
+	hours: {
+		toMilliseconds: 60 * 60 * 1000,
+		toSeconds: 60 * 60,
+	},
+	days: {
+		toSeconds: 24 * 60 * 60,
+		toMilliseconds: 24 * 60 * 60 * 1000,
+	},
+};

packages/@n8n/constants/tsconfig.build.json

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+{
+	"extends": ["./tsconfig.json", "@n8n/typescript-config/tsconfig.build.json"],
+	"compilerOptions": {
+		"composite": true,
+		"rootDir": "src",
+		"outDir": "dist",
+		"tsBuildInfoFile": "dist/build.tsbuildinfo"
+	},
+	"include": ["src/**/*.ts"]
+}

packages/@n8n/constants/tsconfig.json

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+{
+	"extends": "@n8n/typescript-config/tsconfig.common.json",
+	"compilerOptions": {
+		"rootDir": ".",
+		"types": ["node", "jest"],
+		"baseUrl": "src",
+		"tsBuildInfoFile": "dist/typecheck.tsbuildinfo",
+		"experimentalDecorators": true,
+		"emitDecoratorMetadata": true
+	},
+	"include": ["src/**/*.ts"]
+}