A collection of commonly used (albeit enhanced) algorithms based on unist and unist-util-xxx
npm install unist-utils-coreA collection of commonly used (albeit enhanced) algorithms based on unist and unist-util-xxx.
But I wanted a more uniform API and enhanced functionality. Maybe you will like them too.
You can get the latest release using npm:
```
$ npm install unist-utils-core --save
import {Node} from 'unist-utils-core';let node: Node;
...
node.parent.children.find(n => Object.is(n, node));
`Visit
unist-util-visit is nice, but has no ancestral info, and you can't pass an array of nodes.
unist-util-visit-children can pass an array of nodes, but incurs overhead with narrow applicability.
unist-util-visit-parents takes extra processing to determine a node's index in the list of children.
Also, I wanted an easy way to hook begin/end visitation of a node's children.
Optional support has been added for a caller defined context that can be passed to the Visitor.
`
import {visit} from 'unist-utils-core';visit(tree.children, (node, idx, parents, ctx) => {
if (node) {
// Normal visitation of 'node'.
return whatever;
}
else if (idx === Number.MIN_SAFE_INTEGER) {
// beginning traversal of parents[parents.length-1].children
}
else if (idx === Number.MAX_SAFE_INTEGER) {
// finished traversal of parents[parents.length-1].children
}
});
`Test
unist-util-is is a great core utility.
But I also needed a TestFunction that could return true/false, not just a type predicate.
And, I don't use anything except 'is.convert', and that just doesn't sound right. :-)
`
import {Test, test} from 'unist-utils-core';if (test(node, (n) => !!n)) {
...
}
`Find
unist-util-find is usefule, but doesn't use unist-util-is for it's tests (maybe because of the true/false thing mentioned above).
I also needed findAll and findAncestor.
`
import {find, findAll, findAncestor} from 'unist-utils-core';findAll(tree, (node) => node.type === 'foo').map(n => whatever(n));
`Select
unist-util-select may well be my favorite unist utility.
But, I use TypeScript and wanted to be able to type the return value(s).
`
import {select, selectAll} from 'unist-utils-core';selectAll('loop', tree).filter(n => !n.forever);
``Copyright (c) 2020-2023 Frank Stock
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