dynamic-modules

dynamic-ts-modules

A tiny lib that imports Typescript modules (services) dynamically with minimal external dependencies(fs-extra).

At that moment "DynamicLoader" class dynamic import modules.
Examples of usage can see in folder "./examples".

How to use "DynamicLoader" class:

General

loadJson

import {DynamicLoader} from "./src/dynamicLoader";
 
(async () => {
  const someJson = await DynamicLoader.loadJson('./path/to/some.json');
  // do something with loaded json
})().catch(err => {
  // error handler
})

loadModuleByPath

import {DynamicLoader} from "./src/dynamicLoader";
 
(async () => {
  const someModule= await DynamicLoader.loadModuleByPath('./path/to/some/module');
  // do something with dynamic imported module
})().catch(err => {
  // error handler
})

Examples of using

1. Example of using DynamicLoader with "Coworkers" lib

In folder "./examples" You can see "coworkersApp.ts" source code.
For testing this example You must have working AMQP server or use some services in the internet which support this protocol.

Include Your token for AMQP server in "./examples/token.ts" file and run command:

npm run example:coworkers

After this You can publish a massage for "processorFnQueue", "processorFnMakerQueue" or "processorFnFactoryQueue" in AMQP manager.

Result You will see in console when was running "npm run example:coworkers" command

2. Example of using DynamicLoader with "Node.js Express" framework

In folder "./examples" You can see "expressApp.ts" source code.
For testing this example just run command:

npm run example:express

After this You can visit "http://localhost:3000" URL or send GET request to this URL by any HTTP Request manager.

Result You will see in Your browser of HTTP Request manager and console when was running "npm run example:express" command.

3. Example of using DynamicLoader with config file and example of service

Loading service

import {DynamicLoader} from "./src/dynamicLoader"; // importing "DynamicLoader" class
import {ISrvConf, Processor, ProcessorTypes} from "./src/types"; // .json config file interface and processor module interface
 
(async () => {
  const conf = await DynamicLoader.loadJson('./examples/config/services.json');
  
  let dynamicLoader = new DynamicLoader(conf);
  // './examples/config/' - path to dir with config files, at that moment must have all slashes
  
  let service = await dynamicLoader.loadService('service_name'); // service == {config: ISrvConf; processor: Processor; processorType: ProcessorTypes}
})().catch(err => {
  // error handler
})

4. Example of using DynamicLoader with config file and examples of function service, function maker service and function factory service

In folder "./examples" You can see file "processorTypesDemo.ts", just run command:

npm run examples:procs

After that You can see result of work function service, function maker service and function factory service in console where command was running.

Specialized loaders

loadConfig

Using for load config.json file which implements "IConfig" interface.
Used in example #3.

import {DynamicLoader} from "./src/dynamicLoader";
 
(async () => {
  const conf = await DynamicLoader.loadJson('./examples/config/services.json');
  const loader = new DynamicLoader(conf);
  const processorFnServiceJson = await loader.loadConfig('function.service');
})().catch(err => {
  // error handler
})

loadModules

Using for loading modules.
Example of using can see in "expressApp.ts" in dynamic loading "handlerFactory".

loadProcessor

Using for loading service's processor in loadService method which used in example #3.

Testing

You can test "DynamicLoader" class using command:

npm test