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Fix type support for readonly arrays #40

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Fix type support for readonly arrays #40

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14 changes: 14 additions & 0 deletions index.test-d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -204,6 +204,20 @@ visit(sampleTree, 'definition', function (node) {
})
})

visit(sampleTree, ['definition'], function (node) {
visit(node, function (node, _, parent) {
expectNotType<Definition>(node)
expectNotType<never>(parent)
})
})

visit(sampleTree, ['definition'] as const, function (node) {
visit(node, function (node, _, parent) {
expectType<Definition>(node)
expectType<never>(parent)
})
})

function isHeading(node: Node): node is Heading {
return node ? node.type === 'heading' : false
}
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4 changes: 2 additions & 2 deletions lib/index.js
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Expand Up @@ -51,8 +51,8 @@

/**
* @typedef {(
* Check extends Array<any>
* ? MatchesOne<Value, Check[keyof Check]>
* Check extends ReadonlyArray<any>
* ? MatchesOne<Value, Check[number]>
* : MatchesOne<Value, Check>
* )} Matches
* Check whether a node matches a check in the type system.
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