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fix: improve InclusiveDescendant performance #16

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fix: improve InclusiveDescendant performance #16

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36 changes: 33 additions & 3 deletions lib/complex-types.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,18 +4,48 @@
import type {Test} from 'unist-util-is'
import type {Visitor} from './index.js'

type LessThan<
A extends number,
B extends number,
S extends any[] = []
> = S['length'] extends B
? false
: S['length'] extends A
? true
: LessThan<A, B, [...S, any]>

type Subtract<
A extends number,
B extends number,
I extends any[] = [],
O extends any[] = []
> = LessThan<A, B> extends true
? never
: LessThan<I['length'], A> extends true
? Subtract<
A,
B,
[...I, any],
LessThan<I['length'], B> extends true ? O : [...O, any]
>
: O['length']

/**
* Internal utility to collect all descendants of in `Tree`.
*/
export type InclusiveDescendant<
Tree extends Node = never,
Found = void
> = Tree extends Parent
Found = void,
Depth extends number = 5
> = Depth extends 0
? Tree
: Tree extends Parent
?
| Tree
| InclusiveDescendant<
Exclude<Tree['children'][number], Found | Tree>,
Found | Tree
Found | Tree,
Subtract<Depth, 1>
>
: Tree

Expand All @@ -23,7 +53,7 @@
* Infer the thing that is asserted from a type guard.
*/
type Predicate<Fn, Fallback = never> = Fn extends (
value: any

Check failure on line 56 in lib/complex-types.d.ts

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Type Parameter name `Function_` must match one of the following formats: StrictPascalCase

Check failure on line 56 in lib/complex-types.d.ts

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Type Parameter name `Function_` must match one of the following formats: StrictPascalCase
) => value is infer Thing
? Thing
: Fallback
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2 changes: 1 addition & 1 deletion package.json
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Expand Up @@ -62,7 +62,7 @@
"tsd": "^0.25.0",
"type-coverage": "^2.0.0",
"typescript": "^4.7.0",
"xo": "^0.53.0"
"xo": "^0.60.0"
},
"scripts": {
"prepack": "npm run build && npm run format",
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