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4.5 KiB
🌊 defu
Assign default properties, recursively. Lightweight and Fast.
Install
Install package:
# yarn
yarn add defu
# npm
npm install defu
# pnpm
pnpm install defu
Usage
import { defu } from "defu";
const options = defu(object, ...defaults);
Leftmost arguments have more priority when assigning defaults.
Arguments
- object (Object): The destination object.
- source (Object): The source object.
import { defu } from "defu";
console.log(defu({ a: { b: 2 } }, { a: { b: 1, c: 3 } }));
// => { a: { b: 2, c: 3 } }
Using with CommonJS
const { defu } = require("defu");
Custom Merger
Sometimes default merging strategy is not desirable. Using createDefu we can create a custom instance with different merging strategy.
This function accepts obj (source object), key and value (current value) and should return true if applied custom merging.
Example: Sum numbers instead of overriding
import { createDefu } from "defu";
const ext = createDefu((obj, key, value) => {
if (typeof obj[key] === "number" && typeof value === "number") {
obj[key] += value;
return true;
}
});
ext({ cost: 15 }, { cost: 10 }); // { cost: 25 }
Function Merger
Using defuFn, if user provided a function, it will be called with default value instead of merging.
It can be useful for default values manipulation.
Example: Filter some items from defaults (array) and add 20 to the count default value.
import { defuFn } from "defu";
defuFn(
{
ignore: (val) => val.filter((item) => item !== "dist"),
count: (count) => count + 20,
},
{
ignore: ["node_modules", "dist"],
count: 10,
},
);
/*
{
ignore: ['node_modules'],
count: 30
}
*/
Note: if the default value is not defined, the function defined won't be called and kept as value.
Array Function Merger
defuArrayFn is similar to defuFn but only applies to array values defined in defaults.
Example: Filter some items from defaults (array) and add 20 to the count default value.
import { defuArrayFn } from 'defu'
defuArrayFn({
ignore: (val) => val.filter(i => i !== 'dist'),
count: () => 20
}, {
ignore: [
'node_modules',
'dist'
],
count: 10
})
/*
{
ignore: ['node_modules'],
count: () => 20
}
*/
Note: the function is called only if the value defined in defaults is an aray.
Remarks
objectanddefaultsare not modified- Nullish values (
nullandundefined) are skipped. Please use defaults-deep or omit-deep or lodash.defaultsdeep if you need to preserve or different behavior. - Assignment of
__proto__andconstructorkeys will be skipped to prevent security issues with object pollution. - Will concat
arrayvalues (if default property is defined)
console.log(defu({ array: ["b", "c"] }, { array: ["a"] }));
// => { array: ['b', 'c', 'a'] }
Type
We expose Defu as a type utility to return a merged type that follows the rules that defu follows.
import type { Defu } from 'defu'
type Options = Defu<{ foo: 'bar' }, [{}, { bar: 'baz' }, { something: 42 }]>
// returns { foo: 'bar', bar: 'baz', 'something': 42 }
License
MIT. Made with 💖