@ez-hex/config

Load Config from any place and merge it into one.

Install

`` bash
npm install --save @ez-hex/config


or


yarn add @ez-hex/config
`

Usage

$3

` typescript
interface MyConfig {
// defined your config struct
keyA: string
keyB: number
keyC: boolean
}
// config is Partial
const config = loadConfig(defaultLoader({
keyA: 'default A',
keyC: false,
}), jsonLoader('./simple.json'), envLoader('AAA_'))

// config is MyConfig
const config = loadConfigWithDefault({
keyA: 'default A',
keyB: 1,
keyC: false,
}, jsonLoader('./simple.json'), envLoader('AAA_'))
`

$3

There are two type: SyncLoader and AsyncLoader

` typescript
type Loader = SyncLoader | AsyncLoader
type SyncLoader = () => Partial
type AsyncLoader = () => Promise>
`

If all args of loadConfig or loadConfigWithDefault is SyncLoader, then return the value directly, else your will get a Promise.

` typescript
function load_with_async_fs(path: string): () => Promise {
return () => {
return new Promise((resolve, reject) => {
readFile(path, 'utf-8', (err, data) => {
try {
resolve(JSON.parse(data))
} catch (err) {
reject(err)
}
})
})
}
}

// config is Promise>
const config = loadConfig(jsonLoader('./simple.json'), envLoader('AAA_'), load_with_async_fs('./aaa'))

// config2 is Promise
const config2 = loadConfigWithDefault({
keyA: 'default A',
keyB: 1,
keyC: false,
}, jsonLoader('./simple.json'), envLoader('AAA_'), load_with_async_fs('./aaa'))
`

$3

#### defaultLoader

> SyncLoader

It just return the argument

#### envLoaderr

> SyncLoader

It will load all env which has special prefix and parse the value with JSON.parse

` typescript
// env.js
const result = envLoaderr('A_')()
console.log(result)
`

` bash
A_KEYA=aaa node env.js


{KEYA: "aaa"}


`

#### jsonLoaderr

> SyncLoader

load the file and parse the content with JSON.parse`