egg-ts-helper

A simple tool for creating d.ts in egg application. Injecting controller, proxy, service, etc. to definition type of egg ( such as Context Application etc. ) by Declaration Merging, and making IntelliSense works in both egg-js and egg-ts.

Install

open your application and install.

npm i egg-ts-helper --save-dev

QuickStart

Open your egg application, executing ets by npx

npx ets

Watching files by -w flag.

npx ets -w

egg-ts-helper has build-in in egg-bin, You can easily to use it by

egg-bin dev --dts

or add configuration egg.declarations in package.json

CLI

$ ets -h

  Usage: bin [commands] [options]

  Options:
    -v, --version           output the version number
    -w, --watch             Watching files, d.ts would recreated while file changed
    -c, --cwd [path]        Egg application base dir (default: process.cwd)
    -C, --config [path]     Configuration file, The argument can be a file path to a valid JSON/JS configuration file.（default: {cwd}/tshelper
    -o, --oneForAll [path]  Create a d.ts import all types (default: typings/ets.d.ts)
    -s, --silent            Running without output
    -i, --ignore [dirs]     Ignore generator, your can ignore multiple dirs with comma like: -i controller,service
    -e, --enabled [dirs]    Enable generator, your can enable multiple dirs with comma like: -e proxy,other
    -E, --extra [json]      Extra config, the value should be json string
    -h, --help              output usage information

  Commands:
    clean                   Clean js file while it has the same name ts/tsx file
    init <type>             Init egg-ts-helper in your existing project

Configuration

name	type	default	description
cwd	`string`	process.cwd	egg application base dir
typings	`string`	{cwd}/typings	typings dir
caseStyle	`string` `Function`	lower	egg case style(lower,upper,camel) or `(filename) => {return 'YOUR_CASE'}`
silent	`boolean`	false	ignore logging
watch	`boolean`	false	watch file change or not, default to `true` in `register`
watchOptions	`object`	undefined	chokidar options
autoRemoveJs	`boolean`	true	auto remove same name js on startup
configFile	`string`	{cwd}/tshelper.(js	json)
generatorConfig	`object`		generator configuration( watchDirs has been deprecated )

You can configure the options above in ./tshelper.js ./tshelper.json or package.json.

In tshelper.js

// {cwd}/tshelper.js

module.exports = {
  generatorConfig: {
    model: {
      enabled: true,
      generator: "function",
      interfaceHandle: "InstanceType<{{ 0 }}>"
    },
  }
}

In tshelper.json

// {cwd}/tshelper.json

{
  "generatorConfig": {
    "model": {
      "enabled": true,
      "generator": "function",
      "interfaceHandle": "InstanceType<{{ 0 }}>"
    },
  }
}

In package.json

// {cwd}/package.json

{
  "egg": {
    "framework": "egg",
    "tsHelper": {
      "generatorConfig": {
        "model": {
          "enabled": true,
          "generator": "function",
          "interfaceHandle": "InstanceType<{{ 0 }}>"
        }
      }
    }
  }
}

or use dot-prop

// {cwd}/package.json

{
  "egg": {
    "framework": "egg",
    "tsHelper": {
      "generatorConfig.model": {
        "enabled": true,
        "generator": "function",
        "interfaceHandle": "InstanceType<{{ 0 }}>"
      }
    }
  }
}

Also you can pass options by env ( support since 1.22.0 )

ETS_CWD: cwd
ETS_FRAMEWORK: framework
ETS_TYPINGS: typings
ETS_CASE_STYLE: caseStyle
ETS_AUTO_REMOVE_JS: autoRemoveJs
ETS_THROTTLE: throttle
ETS_WATCH: watch
ETS_SILENT: silent
ETS_CONFIG_FILE: configFile

Custom Loader

Support since 1.24.0

egg-ts-helper support customLoader configuration of egg. see https://github.com/eggjs/egg/issues/3480

Configure in config.default.ts

'use strict';

import { EggAppConfig, PowerPartial } from 'egg';

export default function(appInfo: EggAppConfig) {
  const config = {} as PowerPartial<EggAppConfig>;

  config.keys = appInfo.name + '123123';

  config.customLoader = {
    model: {
      directory: 'app/model',
      inject: 'app',
      caseStyle: 'upper',
    },
  };

  return {
    ...config as {},
    ...bizConfig,
  };
}

egg-ts-helper will auto create the d.ts for files under app/model

// This file is created by egg-ts-helper@1.24.1
// Do not modify this file!!!!!!!!!

import 'egg';
type AutoInstanceType<T, U = T extends (...args: any[]) => any ? ReturnType<T> : T> = U extends { new (...args: any[]): any } ? InstanceType<U> : U;
import ExportCastle from '../../../app/model/Castle';
import ExportUser from '../../../app/model/User';

declare module 'egg' {
  interface Application {
    model: T_custom_model;
  }

  interface T_custom_model {
    Castle: AutoInstanceType<typeof ExportCastle>;
    User: AutoInstanceType<typeof ExportUser>;
  }
}

And you can easily to use it in your code.

Generator

If you are using loader.loadToApp or loader.loadToContext to load the instance, you should use generator config.

Example

Creating d.ts for files under app/model. You should add config generatorConfig.model in your config file.

// ./tshelper.js

module.exports = {
  generatorConfig: {
    model: {
      directory: 'app/model', // files directory.
      // pattern: '**/*.(ts|js)', // glob pattern, default is **/*.(ts|js). it doesn't need to configure normally.
      // ignore: '', // ignore glob pattern, default to empty.
      generator: 'class', // generator name, eg: class、auto、function、object
      interface: 'IModel',  // interface name
      declareTo: 'Context.model', // declare to this interface
      // watch: true, // whether need to watch files
      // caseStyle: 'upper', // caseStyle for loader
      // interfaceHandle: val => `ReturnType<typeof ${val}>`, // interfaceHandle
      // trigger: ['add', 'unlink'], // recreate d.ts when receive these events, all events: ['add', 'unlink', 'change']
    }
  }
}

The configuration can create d.ts as below.

Attention, The type will merge into egg without any pre handling if the generator field is class, If you dont know how it works, just using generator: 'auto' instead.

import Station from '../../../app/model/station';// <-- find all files under app/model and import then.

declare module 'egg' {
  interface Context { // <-- Context is reading from `declareTo`
    model: IModel; // <-- IModel is reading from `interface`, It will create a random interface if this field is empty
  }

  interface IModel { // <-- The same as above.
    Station: Station; // <-- Merging `Station` to IModel so we can use `ctx.model.Station` in code.
  }
}

Effect of different options

interface `string`

interface set to IOther.

interface IOther {
  Station: Station;
}

It will use random interface if interface is not set.

interface T100 {
  Station: Station;
}

Attentions: Must set declareTo if interface is not set.

generator `string`

The name of generator, available value is class function object auto.

generator: 'class'

the types created by class generator as below

interface IModel {
  Station: Station;
}

It’s suitable for module wrote like this

export default class XXXController extends Controller { }

generator: 'function' ( Support since 1.16.0 )

the types created by function generator as below

interface IModel {
  Station: ReturnType<typeof Station>; // Using ReturnType to get return type of function.
}

It’s suitable for module like this

export default () => {
  return {};
}

generator: 'object' ( Support since 1.16.0 )

the types created by object generator as below.

interface IModel {
  Station: typeof Station;
}

It’s suitable for module like this

export default {}

generator: 'auto' ( Support since 1.19.0 )

the types created by auto generator as below. It will check types automatically.

type AutoInstanceType<T, U = T extends (...args: any[]) => any ? ReturnType<T> : T> = U extends { new (...args: any[]): any } ? InstanceType<U> : U;

interface IModel {
  Station: AutoInstanceType<typeof Station>;
}

It’s suitable for every module in above.

interfaceHandle `function|string`

If you cannot find suitable generator in above, you can config the type by this field.

module.exports = {
  generatorConfig: {
    model: {
      ...

      interfaceHandle: val => `${val} & { [key: string]: any }`,
    }
  }
}

The generated typings.

interface IModel {
  Station: Station & { [key: string]: any };
}

The type of interfaceHandle can be string ( Support since 1.18.0 )

module.exports = {
  generatorConfig: {
    model: {
      ...

      interfaceHandle: '{{ 0 }} & { [key: string]: any }',
    }
  }
}

The generated typings are the same as above. {{ 0 }} means the first argument in function.

caseStyle `function|string`

caseStyle can set to lower、upper、camel or function

declareTo `string`

Declaring interface to definition of egg. ( Support since 1.15.0 )

declareTo set to Context.model , and you can get intellisense by ctx.model.xxx

import Station from '../../../app/model/station';

declare module 'egg' {
  interface Context {
    model: IModel;
  }

  interface IModel {
    Station: Station;
  }
}

declareTo set to Application.model.subModel, and you can get intellisense by app.model.subModel.xxx

import Station from '../../../app/model/station';

declare module 'egg' {
  interface Application {
    model: {
      subModel: IModel;
    }
  }

  interface IModel {
    Station: Station;
  }
}

Defining custom generator

// ./tshelper.js

// custom generator
function myGenerator(config, baseConfig) {
  // config.dir       dir
  // config.dtsDir    d.ts dir
  // config.file      changed file
  // config.fileList  file list
  console.info(config);
  console.info(baseConfig);

  // return type can be object or array { dist: string; content: string } | Array<{ dist: string; content: string }>
  // egg-ts-helper will remove dist file when content is undefined.
  return {
    dist: 'd.ts file url',
    content: 'd.ts content'
  }
}

module.exports = {
  generatorConfig: {
    model: {
      directory: 'app/model',
      generator: myGenerator,
      trigger: ['add', 'unlink'],
    }
  }
}

or define generator to other js.

// ./my-generator.js

module.exports.defaultConfig = {
  // default watchDir config
}

// custom generator
module.exports = (config, baseConfig) => {
  // config.dir       dir
  // config.dtsDir    d.ts dir
  // config.file      changed file
  // config.fileList  file list
  console.info(config);
  console.info(baseConfig);

  // return type can be object or array { dist: string; content: string } | Array<{ dist: string; content: string }>
  // egg-ts-helper will remove dist file when content is undefined.
  return {
    dist: 'd.ts file url',
    content: 'd.ts content'
  }
}

configure in tshelper.js or package.json

// ./tshelper.js

module.exports = {
  generatorConfig: {
    model: {
      directory: 'app/model',
      generator: './my-generator',
      trigger: ['add', 'unlink'],
    }
  }
}