What This Is:

A command line tool to automatically generate some or all feature set files for NestJS:

• <name>.module.ts
• <name>.controller.ts
• <name>.service.ts
• <name>.repository.ts
• <name>.model.ts

The generated class files will automatically reference each other through imports and injections.

You can customize the templates to your liking with some utility commands (see "Customizing The Templates" section below).

See the ./example_generated folder to see an example of the generated code using all features + CRUD.

(Tip: use --casing pascal to generate pascal-cased filenames, ie. "ExampleModule.ts")

Install:

// Globally:
npm install nestjs-gen -g

// Local project only:
npm install nestjs-gen

// nestjs-gen also relies on typeorm, so in your project:
npm install --save typeorm @nestjs/typeorm

Usage:

(If using with local project only, replace ngen below with: ./node_modules/.bin/ngen, or alias it)

Note: You will need to have a database configured with NestJS in order to use the repositories. See: https://docs.nestjs.com/techniques/database

Generate a Module / Controller / Service / Repository / Model (or all):

ngen <name> <options>

This will generate a folder <name> within the current directory, and then all specified classes according to the options. See below for examples.

(Tip: Use --prefix to place files within a prefix directory, from the current folder)

(Tip: Use --crud to automatically generate CRUD interfaces within the Controller and Service classes)

(See how to set these up as configuration options in tsconfig.json below)

Examples:

Generate a Module with all features (module, controller, service, repository, and model):

ngen example --all

This will generate:

./modules/example/example.module.js         (ExampleModule)
./modules/example/example.controller.js     (ExampleController)
./modules/example/example.service.js        (ExampleService)
./modules/example/example.repository.js     (ExampleRepository)
./modules/example/example.model.js          (Example)
(and corresponding CRUD interface within the controller and service)

Generate just a Controller, Repository, and Example model (no module):

ngen example --crud

This will generate:

./example/example.controller.js             (ExampleController)
./example/example.repository.js             (ExampleRepository)
./example/example.model.js                  (Example)
(and corresponding CRUD interface within the controller and service)

(Tip: If you want the files generated in their own module, specify --module)

Generate each specific thing you want:

ngen example --module --controller --service --repository --model --crud

Or shorter:

ngen example -m -c -s -r -d --crud

This will generate all the respective class files within "./modules/example/", with CRUD interfaces.

Specifying model properties (optional):

ngen example -a --model "prop:type id:number name:string prop:Anything"

If you specify a string of properties to the --model argumenent, the generated model file will add the given properties to the class definition, using the format propName:propType.

Note: An 'id: number' property will automaticaly be generated, with an @PrimaryGeneratedColumn() decorator, because TypeOrm requires at least this property to exist. You can change this property name by passing a property with a type of 'primary', and it will add the property with the decorate, and a type of 'number'. For example: --model "someIdentifier:primary".

It will also add a @Column() decorator for each other property. propType will be used as the exact class name, but will not be imported (if using a custom class), so you have to add the import yourself, for now.

(Currently does not support adding other decorators (ie. joins/relationships), or custom @Column({}) definition properties, which must be added manually, for now.)

Things to Note:

• Generated model class/file names will strip any trailing 's' in the given name, if one exists, unless you set the model class name explicitly with --model-class <name>.
• If you specify --repository or --crud, a model will automatically be generated.
• You can specify --auth, and a @Guard(<auth-guard-class>) decorator will be added to the CRUD interfaces. Your custom auth guard class name and location can be defined with --auth-guard-class <class-name> and --auth-guard-location <dir> (or put in tsconfig.json).
• The generated files will all have their imports and injected dependencies referenced correctly relative to each other, but you will still need to add these references to your main AppModule, or wherever you need to use them. In other words: this package doesn't edit existing files.
• Similarly, modules do not export any classes (ie. Service) by default. You have to add those classes to the generated Module file's exports array manually, for now.
• For now it will only generate TypeScript files (no plain JS), but you can customize the template files if you want to strip the TypeScript stuff (see below).

Using a Configuration File

You can specify generator configuration values by adding an "ngen-config" property inside your project's tsconfig.app.json or tsconfig.json file.

For example (all of these are optional):

// tsconfig.json
{
    "ngen-config": {
        "prefix": "src",
        "modelDir": "models",
        "templateDir": "templates",
        "noSubdir": true,
        "casing": "pascal",
        "authGuardClass": "PrincipalGuard",
        "authGuardDir": "modules/auth/lib",
        "modelBaseClass": "EntityBase",
        "modelBaseDir": "modules/auth/lib"
    }
}

All Options:

Note: If using a configuration file, these command line options will always override the configuration file options.

 -a                              Generate all (Module + Controller + Service + Repository + Model                   optional      default: false
 --all                           Generate all (Module + Controller + Service + Repository + Model                   optional      default: false
 
 -m                              Generate a Module                                                                  optional      default: false
 --module                        Generate a Module                                                                  optional      default: false
 
 -r                              Generate a Repository for the model                                                optional      default: false
 --repo                          Generate a Repository for the model                                                optional      default: false
 --repository                    Generate a Repository for the model                                                optional      default: false
 
 -d                              Generate the model file                                                            optional      default: false
 --model [...prop:type]          Generate the model file (and optional model definition)                            optional
 --model-class <name>            Specify a custom class name for the model                                          optional
 --model-dir <dir>               Specify a subdirectory to put the model in (ie. 'models')                          optional
 --model-base-class <class>      Specify a base class that your model should extend from                            optional
 --model-base-dir <dir>          Specify the import location for the base class model                               optional
 
 -c                              Generate a Controller for the model                                                optional      default: false
 --controller                    Generate a Controller for the model                                                optional      default: false
 
 -s                              Generate a Service for the model                                                   optional      default: false
 --service                       Generate a Service for the model                                                   optional      default: false
 
 --crud                          Generates CRUD actions within the Controller and Service                           optional      default: false
 
 -p <prefix>                     Specify root/prefix dir to generate in                                             optional
 --prefix <prefix>               Specify root/prefix dir to generate in                                             optional
 
 --auth                          CRUD actions will add authentication guards, requiring a logged in user            optional      default: false
 --auth-guard-class <name>       Name of a custom @(Guard<name>) class to use                                       optional
 --auth-guard-dir <dir>          The location of the custom @Guard class file                                       optional

 --template-dir <dir>            The location of the template files to use                                          optional

 --no-subdir                     Don't put generated files in <name> subdirectory (only if not using a module)      optional      default: false
 
 --casing <pascal>               default = "example.controller.ts", pascal = "ExampleController.ts"                 optional
 

Customizing the Templates

To customize the template files, first copy them to your project with this command:

ngen-copy-templates

(./node_modules/bin/ngen-copy-templates if installed locally)

You can specify --dir <dir> to copy the templates to a specific directory, otherwise they'll be put in a templates/ directory.

(Specify -f to force-override existing files.)

Then, edit the templates as needed, and specify their custom location in the ngen-config section of the configuration, or with this command:

ngen --template-dir <dir>