unional
unpartial
Unpartial a type.
It is very common to define a config type and Partial<> it in a function argument.
When we received the argument, 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: Config = { require: { a: 1 } }
function foo(givenConfig?: Partial<Config>) {
const config = unpartial(defaultConfig, givenConfig);
// use config with type safety
}Code completion is available as you type:
const config = unpartial(defaultConfig, { /* code completion here */});It also supports merging two default configs. This is useful when you are extending the 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)
}This is deprecated because currently TypeScript does not support optional generic type, so it is not possible to create a satisfactory signature that works with both implicit and explicit type.
Instead, please use composition when combining 3 or more values:
unpartial(unpartial(defaultOption, myDefaultOption), givenOption)There are 3 more functions available in this library:
unpartialRecursively():unpartial()deeply.\ In practice, this does not seem to be useful. Maybe will be deprecated and removed in the future.required(): an alternative version ofunpartial()with a different type management.\ This will become identical tounpartial()in the future.requiredDeep(): an alternative version ofunpartialRecursively()with a different type management.\ This will become identical tounpartial()in the future.
unpartial is also exposed through type-plus.
It contains many more functions and type utilities.
Feel free to check it out.
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