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@fow/dev-utils

v1.1.2

Published

## Defaulter

Downloads

12

Readme

dev-util

Defaulter

API

约定术语:

config: 你的配置对象

dataPath: 数据位置. 如果有这个一份config数据: {a:{b:1}}

那么: config.a.b 值的 dataPath 就是: 'a.b'.

defign(dataPath, defaultValue, [type[,isForce]] )

  • dataPath: 指向的数据位置
  • defaultValue: 此路径下的默认值
  • type: optional, <'replace', 'define', 'make', 'append'>, 默认 replace

strategy 的 4 个值:

undefined: type: undefined

set 函数 的 length===2 时, strategy 值为 undefined.

如果 config 的 dataPath 指向的值为 undefined, 默认值生效.

如:

defaulter.set('foo.baz', 8)

defaulter.process({})

// 会产生如下 data:

{
  foo: {baz: 8}
}

define:
type: string

此时 defaultValue 参数需要是一个 function, 接收两个参数: config 的 dataPath 的 value, 和整个 config 对象;

无论 config 的 dataPath 指向何值, 都会进行赋值动作, 结果为 defaultValue 函数的执行结果.

如:

defaulter.set('foo.baz', 'define', (val, config)=>{
  if(val===true) return {a:1};
  return Object.assign({},val)
})

defaulter.process({
  foo: {baz: true}
})
// 会产生如下 data:

{
  foo: {baz: {a:1}}
}

make:
type: string

此时 defaultValue 参数需要是一个 function, 接收参数: config 对象

如果 config 的 dataPath 指向的值为 undefined, 进行赋值, 结果为 defaultValue 函数的执行结果..

如:

defaulter.set('foo.baz', ' make', (config)=>{
  if(config.mode===dev) return true;
  return false
})

defaulter.process({
  dev: true
})
// 会产生如下 data:

{
  dev: true,
  foo: {baz: true}
}

append:

值为数组, push 数据