Base types and metadata caching engine for MemberJunction's templating system. Provides cached access to template metadata and can be used on both client and server.

Architecture

graph TD
    subgraph "@memberjunction/templates-base-types"
        A[TemplateEngineBase] --> B[Templates Cache]
        A --> C[Template Contents]
        A --> D[Template Params]
        A --> E[Content Types]
        A --> F[Categories]
    end

    subgraph "Loaded via Dataset"
        G["Template_Metadata<br/>Dataset"]
    end

    G --> A

    H["@memberjunction/templates<br/>(Server Engine)"] --> A

    style A fill:#2d6a9f,stroke:#1a4971,color:#fff
    style B fill:#2d8659,stroke:#1a5c3a,color:#fff
    style C fill:#2d8659,stroke:#1a5c3a,color:#fff
    style D fill:#2d8659,stroke:#1a5c3a,color:#fff
    style E fill:#7c5295,stroke:#563a6b,color:#fff
    style F fill:#7c5295,stroke:#563a6b,color:#fff
    style H fill:#b8762f,stroke:#8a5722,color:#fff

Overview

This package provides the foundational layer for MemberJunction's templating system:

TemplateEngineBase: Singleton engine that loads and caches all template metadata via the Template_Metadata dataset
TemplateRenderResult: Standard result type for template rendering operations
Metadata Access: Cached getters for templates, content types, categories, contents, and params
Template Lookup: Convenience method for finding templates by name (case-insensitive)
Content Association: Automatically associates template contents and params with their parent templates after loading

Installation

npm install @memberjunction/templates-base-types

Usage

Initializing the Engine

import { TemplateEngineBase } from '@memberjunction/templates-base-types';

// Load template metadata
await TemplateEngineBase.Instance.Config(false, contextUser);

// Force refresh
await TemplateEngineBase.Instance.Config(true, contextUser);

Accessing Template Metadata

const engine = TemplateEngineBase.Instance;

// All templates (with Content and Params pre-associated)
const templates = engine.Templates;

// Find a template by name
const emailTemplate = engine.FindTemplate('Welcome Email');

// Access template contents and params
const contents = emailTemplate.Content;
const params = emailTemplate.Params;

// Other metadata
const contentTypes = engine.TemplateContentTypes;
const categories = engine.TemplateCategories;

TemplateRenderResult

import { TemplateRenderResult } from '@memberjunction/templates-base-types';

// Returned by rendering operations
const result: TemplateRenderResult = {
    Success: true,
    Output: '<html>...</html>',
    Message: undefined  // Only set on failure
};

API Reference

TemplateEngineBase

Member	Type	Description
`Instance`	static getter	Singleton instance
`Config()`	method	Load/refresh template metadata
`Templates`	getter	All templates with associated contents and params
`TemplateContentTypes`	getter	Available content types
`TemplateCategories`	getter	Template categories
`TemplateContents`	getter	All template content records
`TemplateParams`	getter	All template parameter definitions
`FindTemplate()`	method	Find template by name (case-insensitive)

TemplateRenderResult

Property	Type	Description
`Success`	boolean	Whether rendering succeeded
`Output`	string	The rendered output
`Message`	string (optional)	Error message on failure

Relationship to @memberjunction/templates

This package provides the metadata caching layer usable anywhere. The @memberjunction/templates package extends it with server-side Nunjucks rendering, custom extensions, and AI prompt integration.

graph LR
    A["@memberjunction/templates-base-types<br/>(Metadata + Types)"] --> B["@memberjunction/templates<br/>(Server Rendering)"]
    C[Client Code] --> A
    D[Server Code] --> B

    style A fill:#2d6a9f,stroke:#1a4971,color:#fff
    style B fill:#2d8659,stroke:#1a5c3a,color:#fff
    style C fill:#b8762f,stroke:#8a5722,color:#fff
    style D fill:#b8762f,stroke:#8a5722,color:#fff

Dependencies

Package	Purpose
`@memberjunction/core`	BaseEngine, UserInfo, IMetadataProvider
`@memberjunction/core-entities`	Template entity types
`@memberjunction/global`	MJGlobal class factory

License

ISC

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Package last updated on 09 Jul 2026

@memberjunction/templates-base-types