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dynamically calculate the combinations for the SortOrder type #389

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dynamically calculate the combinations for the SortOrder type #389

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100 changes: 74 additions & 26 deletions index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -10,29 +10,77 @@ export interface PluginConfig {

export type PrettierConfig = PluginConfig & Config;

type SortOrder =
| 'options-scripts-markup-styles'
| 'options-scripts-styles-markup'
| 'options-markup-styles-scripts'
| 'options-markup-scripts-styles'
| 'options-styles-markup-scripts'
| 'options-styles-scripts-markup'
| 'scripts-options-markup-styles'
| 'scripts-options-styles-markup'
| 'markup-options-styles-scripts'
| 'markup-options-scripts-styles'
| 'styles-options-markup-scripts'
| 'styles-options-scripts-markup'
| 'scripts-markup-options-styles'
| 'scripts-styles-options-markup'
| 'markup-styles-options-scripts'
| 'markup-scripts-options-styles'
| 'styles-markup-options-scripts'
| 'styles-scripts-options-markup'
| 'scripts-markup-styles-options'
| 'scripts-styles-markup-options'
| 'markup-styles-scripts-options'
| 'markup-scripts-styles-options'
| 'styles-markup-scripts-options'
| 'styles-scripts-markup-options'
| 'none';
type SliceArrayEnd<T extends unknown[], N extends number> = T extends [
...infer Rest extends unknown[],
...ArrayWithLength<Subtract<T['length'], N>>,
]
? Rest
: never;
type SliceArrayStart<T extends unknown[], N extends number> = T extends [
...ArrayWithLength<N>,
...infer Rest extends unknown[],
]
? Rest
: never;
type Tail<T extends unknown[]> = SliceArrayStart<T, 1>;

type ArrayWithLength<
Length extends number,
Array extends unknown[] = [],
> = Array['length'] extends Length ? Array : ArrayWithLength<Length, [...Array, unknown]>;
type Add<N1 extends number, N2 extends number> = [
...ArrayWithLength<N1>,
...ArrayWithLength<N2>,
]['length'] &
number;
type Subtract<N1 extends number, N2 extends number> = ArrayWithLength<N1> extends [
...ArrayWithLength<N2>,
...infer R,
]
? R['length']
: never;

type InsertIntoArray<T extends unknown[], ToAdd, Index extends number> = [
...SliceArrayEnd<T, Index>,
ToAdd,
...SliceArrayStart<T, Index>,
];

type InsertIntoEachIndexInArray<T extends unknown[], ToAdd, Count extends number> = [
InsertIntoArray<T, ToAdd, Count>,
...(Count extends T['length'] ? [] : InsertIntoEachIndexInArray<T, ToAdd, Add<Count, 1>>),
];

type AddToCombinations<T extends unknown[][], ToAdd extends unknown> = T extends []
? []
: [
...InsertIntoEachIndexInArray<T[0], ToAdd, 0>,
...(Tail<T> extends infer Narrowed extends unknown[][]
? AddToCombinations<Narrowed, ToAdd>
: never),
];

type Join<T extends string[], JoinWith extends string> = T extends []
? ''
: T['length'] extends 1
? `${T[0]}`
: Tail<T> extends infer Narrowed extends string[]
? `${T[0]}${JoinWith}${Join<Narrowed, JoinWith>}`
: never;

type _EveryCombination<T extends string[], Result extends string[][] = [[T[0]]]> = T extends [
string,
]
? Result
: _EveryCombination<
/** @ts-expect-error not sure why this doesn't narrow but it */
Tail<T>,
AddToCombinations<Result, T[1]>
>;

type EveryCombination<T extends string[]> = Join<
_EveryCombination<T> extends infer Result ? Result[number & keyof Result] : never,
'-'
>;

type SortOrder = EveryCombination<['options', 'scripts', 'markup', 'styles']> | 'none';