The foundational package for the entire MemberJunction ecosystem. @memberjunction/global provides the core infrastructure that every other MJ package depends on: a singleton coordination hub, a dynamic class factory with decorator-based registration, cross-environment global state management, and a collection of essential utilities for validation, diffing, caching, pattern matching, and more.

This package has zero MJ dependencies and sits at the very bottom of the dependency graph, making it safe to import from anywhere in the stack without circular dependency concerns.

Architecture Overview

graph TD
    subgraph MJGlobal["@memberjunction/global"]
        direction TB
        MJG["MJGlobal (Singleton Hub)"]
        CF["ClassFactory"]
        RC["@RegisterClass Decorator"]
        OC["ObjectCache"]
        BS["BaseSingleton&lt;T&gt;"]
        EV["Event System (RxJS)"]

        MJG --> CF
        MJG --> OC
        MJG --> EV
        RC --> CF
        MJG -.->|extends| BS
    end

    subgraph Utilities["Utility Modules"]
        direction TB
        DD["DeepDiffer"]
        JV["JSONValidator"]
        SE["SafeExpressionEvaluator"]
        SQ["SQLExpressionValidator"]
        CU["ClassUtils"]
        PU["PatternUtils"]
        WM["WarningManager"]
        EU["EncryptionUtils"]
        UT["String / JSON Utilities"]
    end

    Core["@memberjunction/core"] --> MJGlobal
    Entities["@memberjunction/core-entities"] --> MJGlobal
    Server["@memberjunction/server"] --> MJGlobal
    Angular["Angular packages"] --> MJGlobal

    style MJGlobal fill:#2d6a9f,stroke:#1a4971,color:#fff
    style Utilities fill:#7c5295,stroke:#563a6b,color:#fff
    style Core fill:#2d8659,stroke:#1a5c3a,color:#fff
    style Entities fill:#2d8659,stroke:#1a5c3a,color:#fff
    style Server fill:#2d8659,stroke:#1a5c3a,color:#fff
    style Angular fill:#2d8659,stroke:#1a5c3a,color:#fff

Installation

npm install @memberjunction/global

Core Concepts

MJGlobal -- The Singleton Hub

MJGlobal is the central coordination point for the MemberJunction runtime. It is a singleton (via BaseSingleton<T>) that provides access to the class factory, a global event bus, a property bag, and an in-memory object cache.

classDiagram
    class MJGlobal {
        +Instance : MJGlobal$
        +ClassFactory : ClassFactory
        +ObjectCache : ObjectCache
        +Properties : MJGlobalProperty[]
        +RegisterComponent(component)
        +RaiseEvent(event)
        +GetEventListener(withReplay?) : Observable~MJEvent~
        +Reset()
    }
    class ClassFactory {
        +Register(baseClass, subClass, key?, priority?)
        +CreateInstance~T~(baseClass, key?, ...params) : T
        +GetRegistration(baseClass, key?) : ClassRegistration
        +GetAllRegistrations(baseClass, key?) : ClassRegistration[]
        +GetRegistrationsByRootClass(rootClass, key?) : ClassRegistration[]
    }
    class ObjectCache {
        +Add~T~(key, object)
        +Find~T~(key) : T
        +Replace~T~(key, object)
        +Remove(key)
        +Clear()
    }
    MJGlobal --> ClassFactory
    MJGlobal --> ObjectCache

    style MJGlobal fill:#2d6a9f,stroke:#1a4971,color:#fff
    style ClassFactory fill:#2d8659,stroke:#1a5c3a,color:#fff
    style ObjectCache fill:#b8762f,stroke:#8a5722,color:#fff

import { MJGlobal } from '@memberjunction/global';

// Access the singleton
const g = MJGlobal.Instance;

// Use the class factory
const instance = g.ClassFactory.CreateInstance<MyBase>(MyBase, 'some-key');

// Use the object cache
g.ObjectCache.Add('config', { debug: true });
const config = g.ObjectCache.Find<{ debug: boolean }>('config');

// Use the global property bag
g.Properties.push({ key: 'appName', value: 'MyApp' });

Class Factory and @RegisterClass

The class factory is MemberJunction's dependency injection system. It allows any module to register a subclass for a given base class and key, so that later code can request an instance by base class and key and automatically receive the most specific (highest-priority) subclass.

flowchart LR
    A["@RegisterClass(BaseEntity, 'Users')"] -->|registers| CF["ClassFactory"]
    B["@RegisterClass(BaseEntity, 'Users', 10)"] -->|higher priority| CF
    CF -->|"CreateInstance(BaseEntity, 'Users')"| B
    CF -->|returns instance of| SUB["UserEntity (priority 10)"]

    style A fill:#64748b,stroke:#475569,color:#fff
    style B fill:#2d8659,stroke:#1a5c3a,color:#fff
    style CF fill:#2d6a9f,stroke:#1a4971,color:#fff
    style SUB fill:#b8762f,stroke:#8a5722,color:#fff

Decorator usage:

import { RegisterClass } from '@memberjunction/global';

// Register a subclass for a base class with a key
@RegisterClass(BaseFormComponent, 'Users')
export class UserFormComponent extends BaseFormComponent {
    // ...
}

// Priority controls which registration wins
@RegisterClass(BaseFormComponent, 'Users', 10)
export class CustomUserFormComponent extends UserFormComponent {
    // Wins over UserFormComponent because priority 10 > auto-assigned
}

Programmatic registration:

MJGlobal.Instance.ClassFactory.Register(
    BaseEntity,      // base class
    UserEntity,      // subclass
    'Users',         // key
    5                // priority (optional)
);

Instance creation:

const entity = MJGlobal.Instance.ClassFactory.CreateInstance<BaseEntity>(
    BaseEntity,
    'Users'
);
// Returns an instance of the highest-priority registered subclass for 'Users'

Structured registration: `@RegisterClassEx` + metadata

When a registration needs anything beyond (baseClass, key, priority) — toggling the rarely-used flags, or attaching metadata for runtime filtering — reach for @RegisterClassEx. It's the same registration under the hood, but accepts a typed options bag instead of trailing positional booleans:

import { RegisterClassEx } from '@memberjunction/global';

@RegisterClassEx(BaseFormPanel, {
    key: 'content-sources:tag-pipeline',
    skipNullKeyWarning: true,
    metadata: {
        entity: 'MJ: Content Sources',
        slot: 'after-fields',
        sortKey: 100,
    },
})
export class TagPipelinePanel extends BaseFormPanel { /* ... */ }

The metadata field is stored on the ClassRegistration and is purely a runtime aid for discovery — it has no effect on the priority / key lookup. Pair it with one of the discovery helpers below:

Helper	Use when …
`GetAllRegistrationsByMetadata(base, predicate)`	You have structured discriminators (`entity`, `slot`, `sortKey`, etc.) and want to filter on multiple fields. Recommended default.
`GetAllRegistrationsByKeyPrefix(base, prefix)`	Registrations share a structured key prefix (e.g. `"breed:..."` / `"<EntityName>:..."`) and you want everything below that prefix.
`GetAllRegistrationsByKeyPattern(base, regex)`	More nuanced key matching than a prefix can express.

// Discover every panel that should appear in a given form's slot
const panels = MJGlobal.Instance.ClassFactory.GetAllRegistrationsByMetadata(
    BaseFormPanel,
    (m) => m?.entity === 'MJ: Content Sources' && m?.slot === 'after-fields',
);
// Sort by metadata.sortKey, then by Priority, then by registration order
panels.sort((a, b) => {
    const aSort = (a.Metadata?.sortKey as number) ?? 0;
    const bSort = (b.Metadata?.sortKey as number) ?? 0;
    return bSort !== aSort ? bSort - aSort : b.Priority - a.Priority;
});

@RegisterClass also accepts an optional sixth positional metadata arg for parity, but the options-bag form scales better past three arguments and reads better at call sites — prefer @RegisterClassEx for new code.

Event System

MJGlobal provides a publish/subscribe event bus built on RxJS. Events can be observed in real-time or with replay (a ReplaySubject buffering up to 100 events for 30 seconds).

import { MJGlobal, MJEventType } from '@memberjunction/global';

// Subscribe to events (with replay for late subscribers)
MJGlobal.Instance.GetEventListener(true).subscribe(event => {
    if (event.event === MJEventType.LoggedIn) {
        console.log('User logged in:', event.args);
    }
});

// Raise an event
MJGlobal.Instance.RaiseEvent({
    event: MJEventType.ComponentEvent,
    eventCode: 'data-loaded',
    args: { recordCount: 42 },
    component: myComponent
});

Built-in event types:

Event Type	Description
`ComponentRegistered`	A component was registered with MJGlobal
`ComponentUnregistered`	A component was unregistered
`ComponentEvent`	Generic component-level event
`LoggedIn`	User authentication succeeded
`LoggedOut`	User logged out
`LoginFailed`	Authentication attempt failed
`LogoutFailed`	Logout attempt failed
`ManualResizeRequest`	Request for UI components to recalculate layout
`DisplaySimpleNotificationRequest`	Request to show a notification to the user

BaseSingleton<T>

A generic abstract base class for implementing the singleton pattern. It uses the global object store (window in browsers, global in Node.js) to guarantee a single instance even when module code is duplicated across multiple bundle paths.

import { BaseSingleton } from '@memberjunction/global';

export class MyService extends BaseSingleton<MyService> {
    public static get Instance(): MyService {
        return super.getInstance<MyService>();
    }

    public DoWork(): void {
        // service logic
    }
}

// Usage
MyService.Instance.DoWork();

Utility Modules

DeepDiffer -- Object Comparison

Recursively compares two objects and produces a detailed, human-readable diff with change tracking.

import { DeepDiffer, DiffChangeType } from '@memberjunction/global';

const differ = new DeepDiffer({
    maxDepth: 10,
    treatNullAsUndefined: true,
    includeUnchanged: false
});

const result = differ.diff(
    { name: 'Alice', age: 30, tags: ['dev'] },
    { name: 'Alice', age: 31, tags: ['dev', 'lead'] }
);

console.log(result.summary);
// { added: 1, removed: 0, modified: 2, unchanged: 0, totalPaths: 3 }

console.log(result.formatted);
// === Deep Diff Summary ===
// Total changes: 3
//   Added: 1
//   Modified: 2
// ...

JSONValidator -- Template-Based Validation

A lightweight validator that checks objects against example templates using special field-name syntax for validation rules.

import { JSONValidator } from '@memberjunction/global';

const validator = new JSONValidator();

const template = {
    "name": "example",               // required
    "email?": "user@example.com",    // optional (? suffix)
    "config*": {},                   // required, any content (* suffix)
    "tags:[1+]": ["tag1"],           // array with 1+ items
    "count:number": 0,               // must be a number
    "title:string:!empty": ""        // must be a non-empty string
};

const result = validator.validate(myData, template);
if (!result.Success) {
    console.log(result.Errors);
}

Supported validation rules:

Syntax	Meaning
`field?`	Field is optional
`field*`	Required, accepts any content
`field:string`	Must be a string
`field:number`	Must be a number
`field:boolean`	Must be a boolean
`field:object`	Must be a plain object
`field:array`	Must be an array
`field:!empty`	Must not be empty
`field:[N+]`	Array with at least N elements
`field:[N-M]`	Array with N to M elements
`field:[=N]`	Array with exactly N elements

SafeExpressionEvaluator

Evaluates boolean expressions against context objects securely, blocking injection patterns like eval(), require(), process., template literals, and more.

import { SafeExpressionEvaluator } from '@memberjunction/global';

const evaluator = new SafeExpressionEvaluator();

const result = evaluator.evaluate(
    "customer.tier == 'premium' && order.total > 1000",
    {
        customer: { tier: 'premium' },
        order: { total: 1500 }
    }
);

if (result.success) {
    console.log(result.value); // true
}

Supports comparisons (==, !=, <, >, <=, >=), logical operators (&&, ||, !), dot-notation property access, bracket-notation array access, and safe string/array methods (.includes(), .startsWith(), .some(), .every(), etc.).

SQLExpressionValidator

Validates user-provided SQL expressions and full queries against injection attacks. Provides context-aware validation (WHERE clauses, ORDER BY, aggregates, field references, full queries) with an allowlist of safe SQL functions.

Expression validation (WHERE clauses, aggregates, ORDER BY):

import { SQLExpressionValidator } from '@memberjunction/global';

const validator = SQLExpressionValidator.Instance;

// Validate a WHERE clause
const result = validator.validate("Status = 'Active' AND Total > 100", {
    context: 'where_clause'
});
// result.valid === true

// Unsafe input is rejected
const bad = validator.validate("Name = 'test'; 1=1", {
    context: 'where_clause'
});
// bad.valid === false

Full query validation (ad-hoc SELECT/WITH statements):

// Validate a complete SQL query — allows SELECT, JOINs, subqueries, set operations, comments
const result = validator.validateFullQuery('SELECT TOP 10 * FROM __mj.vwUsers WHERE IsActive = 1');
// result.valid === true

// Mutations and dangerous operations are blocked
const bad = validator.validateFullQuery("INSERT INTO Users (Name) VALUES ('hacked')");
// bad.valid === false, bad.trigger === 'INSERT'

The full_query context allows keywords that are legitimate in SELECT statements (EXISTS, ANY, ALL, UNION, INTERSECT, EXCEPT, IF) while still blocking all mutations (INSERT, UPDATE, DELETE, DROP, etc.), dangerous operations (EXEC, OPENROWSET, WAITFOR), and multi-statement injection (semicolons).

ClassUtils -- Reflection Helpers

Functions for introspecting class hierarchies at runtime.

import {
    GetSuperclass,
    GetRootClass,
    IsSubclassOf,
    IsRootClass,
    GetClassInheritance,
    GetFullClassHierarchy,
    GetClassName,
    IsClassConstructor
} from '@memberjunction/global';

const chain = GetClassInheritance(MyDerivedClass);
// [{ name: 'MyBaseClass', reference: ... }, { name: 'MyRootClass', reference: ... }]

const isChild = IsSubclassOf(ChildClass, ParentClass); // true
const root = GetRootClass(ChildClass); // returns the top-most user-defined class

PatternUtils -- Wildcard and Regex Matching

Converts wildcard patterns and regex strings to RegExp objects for flexible text matching.

import { parsePattern, matchesAnyPattern } from '@memberjunction/global';

const regex = parsePattern('*AIPrompt*');   // matches strings containing "AIPrompt"
const exact = parsePattern('Users');        // matches exactly "Users" (case-insensitive)
const re = parsePattern('/^sp_Create/i');   // parsed as a regex literal

const matches = matchesAnyPattern('AIPromptRuns', ['*Prompt*', '*Agent*']); // true

ObjectCache

A simple in-memory key-value cache with type-safe generic accessors. Keys are case-insensitive.

import { MJGlobal } from '@memberjunction/global';

const cache = MJGlobal.Instance.ObjectCache;

cache.Add('user-prefs', { theme: 'dark' });
const prefs = cache.Find<{ theme: string }>('User-Prefs'); // case-insensitive lookup
cache.Replace('user-prefs', { theme: 'light' });
cache.Remove('user-prefs');
cache.Clear();

WarningManager

A singleton warning system with session-level deduplication, debounced output, and tree-structured formatting. Tracks deprecation warnings, field-not-found warnings, and redundant load warnings.

import { WarningManager } from '@memberjunction/global';

const wm = WarningManager.Instance;

// Configure
wm.UpdateConfig({ DebounceMs: 5000, GroupWarnings: true });

// Record warnings (deduplicated and batched automatically)
wm.RecordEntityDeprecationWarning('User Preferences', 'BaseEntity::constructor');
wm.RecordFieldNotFoundWarning('Users', 'DeletedColumn', 'BaseEntity::SetMany');
wm.RecordRedundantLoadWarning('AI Models', ['DashboardEngine', 'AIEngine']);

// Force immediate output if needed
wm.FlushWarnings();

EncryptionUtils

Constants and utility functions for working with encrypted field values. Located in this foundational package so any package can detect encrypted values without depending on the full Encryption package.

import {
    IsValueEncrypted,
    IsEncryptedSentinel,
    ENCRYPTION_MARKER,
    ENCRYPTED_SENTINEL
} from '@memberjunction/global';

IsValueEncrypted('$ENC$keyId$AES-256-GCM$iv$ciphertext$authTag'); // true
IsValueEncrypted('[!ENCRYPTED$]');                                 // true (sentinel)
IsValueEncrypted('plain text');                                    // false
IsEncryptedSentinel('[!ENCRYPTED$]');                              // true

String and JSON Utilities

A collection of utility functions for common string and JSON operations.

Function	Description
`CleanJSON(input)`	Extracts and formats JSON from various formats (double-escaped, markdown blocks, mixed content)
`SafeJSONParse<T>(json, logErrors?)`	Parses JSON returning `T` or `null` without throwing
`CleanAndParseJSON<T>(input, logErrors?)`	Combines `CleanJSON` and `SafeJSONParse` in one call
`ParseJSONRecursive(obj, options?)`	Recursively parses nested JSON strings within objects
`CleanJavaScript(code)`	Extracts JavaScript from markdown code blocks
`CopyScalarsAndArrays<T>(input, resolveCircular?)`	Deep-copies scalar and array properties, optionally handling circular references
`convertCamelCaseToHaveSpaces(s)`	`"AIAgentRun"` becomes `"AI Agent Run"`
`stripWhitespace(s)`	Removes all whitespace from a string
`generatePluralName(singular, options?)`	Handles irregular and regular English pluralization
`getIrregularPlural(word)`	Looks up irregular plural forms
`adjustCasing(word, options?)`	Capitalizes first letter, entire word, or leaves as-is
`stripTrailingChars(s, chars, skipIfExact?)`	Removes trailing substring
`replaceAllSpaces(s)`	Removes all space characters
`compareStringsByLine(str1, str2, log?)`	Line-by-line diff with character-level detail
`IsOnlyTimezoneShift(date1, date2)`	Detects if two dates differ only by a whole-hour timezone offset
`InvokeManualResize(delay?, component?)`	Broadcasts a `ManualResizeRequest` event
`uuidv4()`	Generates a v4 UUID
`GetGlobalObjectStore()`	Returns `window` (browser) or `global` (Node.js) for cross-environment state

ValidationTypes

Standard validation result types used across the framework.

import { ValidationResult, ValidationErrorInfo, ValidationErrorType } from '@memberjunction/global';

const result = new ValidationResult();
result.Success = false;
result.Errors.push(
    new ValidationErrorInfo('fieldName', 'Value is required', null, ValidationErrorType.Failure)
);

Module Dependency Flow

flowchart TB
    subgraph MJGlobal["@memberjunction/global (this package)"]
        direction LR
        G["MJGlobal"]
        CF["ClassFactory"]
        RC["RegisterClass"]
        BS["BaseSingleton"]
        OC["ObjectCache"]
        U["Utilities"]
    end

    subgraph External["External Dependencies"]
        RX["rxjs"]
        LO["lodash"]
        UUID["uuid"]
    end

    G --> RX
    U --> LO
    U --> UUID

    subgraph Consumers["Consuming Packages (examples)"]
        direction LR
        MJC["@memberjunction/core"]
        MCE["@memberjunction/core-entities"]
        GQL["@memberjunction/graphql-dataprovider"]
        ENC["@memberjunction/encryption"]
    end

    Consumers --> MJGlobal

    style MJGlobal fill:#2d6a9f,stroke:#1a4971,color:#fff
    style External fill:#b8762f,stroke:#8a5722,color:#fff
    style Consumers fill:#2d8659,stroke:#1a5c3a,color:#fff

API Reference

MJGlobal

Member	Type	Description
`Instance`	`MJGlobal` (static)	Returns the singleton instance
`ClassFactory`	`ClassFactory`	Access the class registration and instantiation system
`ObjectCache`	`ObjectCache`	In-memory key-value cache
`Properties`	`MJGlobalProperty[]`	Global property bag for arbitrary key-value storage
`RegisterComponent(component)`	`void`	Register an `IMJComponent`
`RaiseEvent(event)`	`void`	Publish an `MJEvent` to all listeners
`GetEventListener(withReplay?)`	`Observable<MJEvent>`	Subscribe to the event stream
`Reset()`	`void`	Reset all internal state (use with extreme caution)

ClassFactory

Method	Returns	Description
`Register(baseClass, subClass, key?, priority?, skipNullKeyWarning?, autoRegisterWithRootClass?)`	`void`	Register a subclass for a base class and optional key
`CreateInstance<T>(baseClass, key?, ...params)`	`T \| null`	Create an instance of the highest-priority registered subclass (sync)
`CreateInstanceAsync<T>(baseClass, key?, ...params)`	`Promise<T \| null>`	Async version that triggers lazy loaders if registration not found
`GetRegistration(baseClass, key?)`	`ClassRegistration \| null`	Get the highest-priority registration (sync)
`GetRegistrationAsync(baseClass, key?)`	`Promise<ClassRegistration \| null>`	Async version that triggers lazy loaders if registration not found
`GetAllRegistrations(baseClass, key?)`	`ClassRegistration[]`	Get all registrations for a base class and optional key
`GetRegistrationsByRootClass(rootClass, key?)`	`ClassRegistration[]`	Get registrations by root class in the hierarchy
`RegisterLazyLoader(loader)`	`void`	Register a callback `(baseClassName, key) => Promise<boolean>` called when a registration is not found. Multiple loaders can be registered and are called in order.

RegisterClass Decorator

function RegisterClass(
    baseClass: unknown,
    key?: string | null,
    priority?: number,
    skipNullKeyWarning?: boolean,
    autoRegisterWithRootClass?: boolean
): (constructor: Function) => void;

ObjectCache

Method	Returns	Description
`Add<T>(key, object)`	`void`	Add entry; throws if key exists
`Find<T>(key)`	`T \| null`	Case-insensitive key lookup
`Replace<T>(key, object)`	`void`	Replace or add entry
`Remove(key)`	`void`	Remove entry by key
`Clear()`	`void`	Remove all entries

DeepDiffer

Method	Returns	Description
`diff<T>(oldValue, newValue)`	`DeepDiffResult`	Generate a full diff between two values
`updateConfig(config)`	`void`	Update configuration options

JSONValidator

Method	Returns	Description
`validate(data, template, path?)`	`ValidationResult`	Validate data against a template
`validateAgainstSchema(data, schemaJson)`	`ValidationResult`	Validate against a JSON string schema
`cleanValidationSyntax<T>(data)`	`T`	Strip validation markers from keys

SafeExpressionEvaluator

Method	Returns	Description
`evaluate(expression, context, enableDiagnostics?)`	`ExpressionEvaluationResult`	Evaluate a single boolean expression
`evaluateMultiple(expressions, context)`	`Record<string, ExpressionEvaluationResult>`	Evaluate multiple expressions

SQLExpressionValidator

Method	Returns	Description
`Instance` (static)	`SQLExpressionValidator`	Singleton accessor
`validate(expression, options)`	`SQLValidationResult`	Validate a SQL expression with context-specific rules
`validateFullQuery(sql)`	`SQLValidationResult`	Validate a full SELECT/WITH query (convenience for `validate(sql, { context: 'full_query' })`)

WarningManager

Method	Returns	Description
`Instance` (static)	`WarningManager`	Singleton accessor
`UpdateConfig(config)`	`void`	Update warning configuration
`GetConfig()`	`Readonly<WarningConfig>`	Get current configuration
`RecordEntityDeprecationWarning(entityName, callerName)`	`boolean`	Record an entity deprecation warning
`RecordFieldDeprecationWarning(entityName, fieldName, callerName)`	`boolean`	Record a field deprecation warning
`RecordFieldNotFoundWarning(entityName, fieldName, context)`	`boolean`	Record a field-not-found warning
`RecordRedundantLoadWarning(entityName, engines)`	`boolean`	Record a redundant data loading warning
`FlushWarnings()`	`void`	Force immediate output of all pending warnings
`Reset()`	`void`	Clear all tracking state

Dependencies

Package	Purpose
`rxjs`	Observable-based event system (`Subject`, `ReplaySubject`)
`lodash`	Deep comparison, type checking, object utilities
`uuid`	UUID v4 generation

Package	Relationship
`@memberjunction/core`	Builds on MJGlobal; adds Metadata, RunView, BaseEntity, and more
`@memberjunction/core-entities`	Generated entity subclasses registered via `@RegisterClass`
`@memberjunction/encryption`	Full encryption implementation; uses `EncryptionUtils` constants from this package
`@memberjunction/server`	Server-side runtime that depends on MJGlobal for class factory and events
`@memberjunction/graphql-dataprovider`	Client-side data provider registered through the class factory

Build

# From the package directory
cd packages/MJGlobal
npm run build

The build step runs tsc followed by tsc-alias for path alias resolution.

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Package last updated on 16 Jun 2026

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Install

@memberjunction/global