unpartial

Unpartial

Unpartial an interface

It is very common to define a config interface and Partial<> it in a function argument. When we received the arguement, we want to merge it with our default config before using it:

import { unpartial } from 'unpartial'

interface Config {
  require: { a: number }
  optional?: { a: number }
}
const defaultConfig = { require: { a: 1 } }

function foo(givenConfig: Partial<Config>) {
  const config = unpartial(defaultConfig, givenConfig);
  // use config with type safety
}

Code complete is avaiable as you type:

const config = unpartial(defaultConfig, { /* code completion here */});

It also supports merging two default configs. This is useful when you are extending interface from another package/class.

import { unpartial } from 'unpartial'

import { Option, defaultOption } from 'another-package'

interface MyOption extends Option { ... }

const myDefaultOption = { ... }

function foo(givenOption: Partial<MyOption>) {
  const option = unpartial(defaultOption, myDefaultOption, givenOption)
}

Contribute

# right after fork
npm install

# begin making changes
npm run watch