1.0.0 • Published 7 years ago
decircularize v1.0.0
decircularize
Remove circular dependencies. It also functions as a deep-copy, to ensure that the input is never mutated and that the output can be trusted, even if there are no issues with circular structures.
Usage
The default behavior replaces the dependencies with a string suitable for debugging.
import decircularize from 'decircularize'
var obj = {
a: 1,
b: { something: 2 }
}
obj.b.bad = obj
obj.b.alsoBad = obj.b
JSON.stringify(obj) // explodes
JSON.stringify(decircularize(obj), null, 2)
/* returns
{
a: 1,
b: {
something: 2,
bad: '[Circular to: <root>]',
alsoBad: '[Circular to: <root>.b]'
}
}
*/
This can easily be overridden for any custom need. For example, imagine a REST
API where each entity have an id
prop that uniquely identifies it:
import decircularize from 'decircularize'
var obj = {
id: '123',
b: {
id: 'abc',
entities: [ 2 ]
}
}
obj.b.entities.push(obj.b)
decircularize(obj, {
onCircular: (object, otherPath, offendingPath) => {
assert(object === obj.b)
// In this instance, otherPath equals [ '<root>', 'b' ]
// and offendingPath equals [ '<root>', 'b', 'entities', 1 ]
return { id: object.id }
}
})
/* returns
{
a: 1,
b: {
id: 'abc',
entities: [
2,
{ id: 'abc' }
]
}
}
*/
1.0.0
7 years ago