# Templating

PlatformViewsSupportedEngines is a decorator which can be used on a controller method (endpoint). This decorator will use the data returned by the method, and the configured view to create the response.

# Configuration

Ts.ED is using consolidate (opens new window) under the hood. The default template engine installed with Ts.ED is EJS (opens new window). If you want to use another engine, please refer to the engine documentation and consolidate (opens new window) to install the engine correctly.

import {Configuration} from "@tsed/common";

const rootDir = __dirname;

@Configuration({
  rootDir,
  viewsDir: `${rootDir}/views`,
  views: {
    root: `${rootDir}/views`,
    viewEngine: "ejs",
    extensions: { // optional
      "ejs": "ejs",
      "hbs": "handlebars"
    },
    options: {
      ejs: {} // global options for ejs engine. See official engine documentation for more details.
    }
  }
})
class Server {
}

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See supported engines is available here (opens new window).

# Options

export interface PlatformViewsSettings {
 /**
  * Views directory.
  */
  root?: string;
  /**
   * Enable cache. Ts.ED enables cache in PRODUCTION profile by default.
   */
  cache?: boolean;
 /**
  * Provide extensions mapping to match the expected engines.
  */
  extensions?: Partial<PlatformViewsExtensionsTypes>;
 /**
  * Default view engine extension. 
  * Allow omitting extension when using View decorator or render method.
  */
  viewEngine?: string;
 /**
  * Options mapping for each engine.
  */
  options?: Partial<PlatformViewsEngineOptions>;
}

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# Usage

# Template Engine Instances

Template engines are exposed via the PlatformViews.consolidate.requires object, but they are not instantiated until you've called the PlatformViews.consolidate[engine].render() method. You can instantiate them manually beforehand if you want to add filters, globals, mixins, or other engine features.

Reference

Template Engine Instances (opens new window).

import { Configuration } from "@tsed/common";
import nunjucks from "nunjucks";

const rootDir = Path.resolve(__dirname);

const nunjucksInstances = nunjucks.configure(`${rootDir}/views`);
nunjucksInstances.addFilter('foo', function () {
  return 'bar';
});

@Configuration({
  views: {
    root: `${rootDir}/views`,
    viewEngine: "nunjucks",
    extensions: {
      "njk": "nunjucks"
    },
    options: {
      nunjucks: {
        requires: nunjucksInstances
      }
    }
  },
})
export default class ShopApp {}

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# With decorator

Here is an example of a controller using the PlatformViewsSupportedEngines decorator:

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Like Express.js or Koa.js, PlatformViewsSupportedEngines decorator uses express.response.locals or koa.context.state to populate data before rendering the template. See Locals decorator usage for more information.

# With render method

It's also possible to render a view by injecting and using PlatformResponse instance.

# With PlatformViews

Ts.ED provides the PlatformViewsSupportedEngines service to render views. In fact, PlatformViewsSupportedEngines decorator uses PlatformResponse.render() method which itself uses the PlatformViews.render() method. It is useful if you want to render a template from a service.

import {Inject, Injectable, PlatformViews} from "@tsed/common";

@Injectable()
export class MyService {
  @Inject()
  platformViews: PlatformViews;

  public async renderTemplate(data: any) {
    const result = await this.platformViews.render("view.ejs", {
      // some other options
      // ...
      ...data
    });

    console.log(result);

    return result;
  }
}

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# Caching

To enable caching, simply pass { cache: true } to the PlatformViewsSupportedEngines decorator. All engines that consolidate.js implements I/O for, will cache the file contents, ideal for production environments.

import {Controller, Get, View} from "@tsed/common";

@Controller("/events")
export class EventCtrl {
  @Get("/:id")
  @View("event.ejs", {cache: true})
  public get(): any {
    return {startDate: new Date(), name: "MyEvent"};
  }
}

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Ts.ED enables cache by default in PRODUCTION profile.