nlcst-test
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!Chatchat-badgechatnlcst utility to assert trees.
Contents
* [`assert(tree[, parent])`](#asserttree-parent)
* [`parent(tree[, parent])`](#parenttree-parent)
* [`literal(node[, parent])`](#literalnode-parent)
* [`_void(node[, parent])`](#_voidnode-parent)
* [`wrap(fn)`](#wrapfn)
* [`AssertionError`](#assertionerror)
What is this?
This package is a tiny utility that helps you deal with nodes.When should I use this?
This utility is typically useful when you expect certain nodes in your APIs and want to make sure they’re valid and as expected.A different utility,
unist-util-assert
unist-util-assert, does the same but
for any unist node.Install
This package is ESM onlyesm. In Node.js (version 16+), install with npm:npm install nlcst-test
In Deno with
esm.sh
esmsh:import {assert} from 'https://esm.sh/nlcst-test@4'
In browsers with
esm.sh
esmsh:<script type="module">
import {assert} from 'https://esm.sh/nlcst-test@4?bundle'
</script>
Use
import {assert} from 'nlcst-test'
assert({type: 'RootNode', children: []})
assert({type: 'SourceNode', value: 'fn()'})
assert({type: 'WordNode', children: [{type: 'TextNode', value: 'Hi'}]})
// All OK.
assert({children: []})
// AssertionError: node should have a type: `{ children: [] }`
assert({type: 'WordNode', value: 'foo'})
// AssertionError: parent should have children: `{ type: 'WordNode', value: 'foo' }`
API
This package exports the identifiers_void
api-void,
assert
api-assert,
literal
api-literal,
parent
api-parent, and
wrap
api-wrap.
There is no default export.assert(tree[, parent])
Assert that tree
is a valid nlcst Node
node.If
tree
is a parent, all children will be asserted too.Supports unknown nlcst nodes.
Parameters
tree
(unknown
)
— thing to assert
parent
(Parent
parent-node, optional)
— optional, valid parent
Returns
Nothing.Throws
Whentree
(or its descendants) is not an nlcst node
(AssertionError
api-assertion-error).parent(tree[, parent])
Assert that tree
is a valid nlcst Parent
parent-node.All children will be asserted too.
Supports unknown nlcst nodes.
Parameters
tree
(unknown
)
— thing to assert
parent
(Parent
parent-node, optional)
— optional, valid parent
Returns
Nothing.Throws
Whentree
is not a parent or its descendants are not nodes
(AssertionError
api-assertion-error)literal(node[, parent])
Assert that node
is a valid nlcst Literal
literal-node.Supports unknown nlcst nodes.
Parameters
node
(unknown
)
— thing to assert
parent
(Parent
parent-node, optional)
— optional, valid parent
Returns
Nothing.Throws
Whennode
is not an nlcst literal (AssertionError
api-assertion-error)._void(node[, parent])
Re-exported from unist-util-assert
unist-util-assert-void.wrap(fn)
Re-exported from unist-util-assert
unist-util-assert-wrap.AssertionError
Re-exported from unist-util-assert
unist-util-assert-assertion-error.Types
This package is fully typed with TypeScript. It exports the additional typeAssertionError
api-assertion-error.Compatibility
Projects maintained by the unified collective are compatible with maintained versions of Node.js.When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line,
nlcst-test@^4
,
compatible with Node.js 16.Related
— assert unist trees
— assert mdast trees
— assert hast trees
Contribute
Seecontributing.md
contributing in syntax-tree/.github
health for
ways to get started.
See support.md
support for ways to get help.This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.