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babel-plugin-idx
Advanced tools
idx
is a utility function for traversing properties on objects and arrays.
If an intermediate property is either null or undefined, it is instead returned. The purpose of this function is to simplify extracting properties from a chain of maybe-typed properties.
This module exists as a stop-gap solution because JavaScript does not currently support optional chaining.
Consider the following type for props
:
type User = {
user: ?{
name: string,
friends: ?Array<User>,
}
};
Getting to the friends of my first friend would resemble:
props.user &&
props.user.friends &&
props.user.friends[0] &&
props.user.friends[0].friends
Instead, idx
allows us to safely write:
idx(props, _ => _.user.friends[0].friends)
The second argument must be a function that returns one or more nested member expressions. Any other expression has undefined behavior.
Flow understands the idx
idiom:
// @flow
import idx from 'idx';
function getName(props: User): ?string {
return idx(props, _ => _.user.name);
}
The idx
runtime function exists for the purpose of illustrating the expected
behavior and is not meant to be executed. The idx
function is used in
conjunction with a Babel plugin that replaces it with better performing code.
This babel plugin searches for requires or imports to the idx
module and
replaces all its usages, so this code:
import idx from 'idx';
function getFriends() {
return idx(props, _ => _.user.friends[0].friends)
};
gets transformed to something like:
function getFriends() {
props.user == null ? props.user :
props.user.friends == null ? props.user.friends :
props.user.friends[0] == null ? props.user.friends[0] :
return props.user.friends[0].friends
}
(note that the original import
gets also removed).
It's possible to customize the name of the import/require, so code that is not
directly requiring the idx
npm package can also get transformed:
{
plugins: [
["babel-plugin-idx", {
importName: './idx',
}]
]
}
idx
is MIT licensed.
2.2.0 / 2017-10-27
idx
.babel-plugin-idx
and idx
as MIT.FAQs
Babel plugin for transforming the idx utility function.
The npm package babel-plugin-idx receives a total of 5,409 weekly downloads. As such, babel-plugin-idx popularity was classified as popular.
We found that babel-plugin-idx demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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