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Add function override, support narrowing when using a type guard as the resolver function #585

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Add function override, support narrowing when using a type guard as the resolver function #585

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ed6b3c7
Add function override, fixes: https://github.com/angus-c/just/issues/584
vidhill Sep 3, 2024
534be40
Update test, casting of resulting array is no longer necessary
vidhill Nov 11, 2024
ae197c2
Type function as a type guard
vidhill Nov 11, 2024
3faee03
Add additional test, checking type narrowing
vidhill Nov 11, 2024
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4 changes: 3 additions & 1 deletion packages/array-partition/index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,4 +11,6 @@
* partition(['a', 1, 2, 'b'], x => typeof x == 'string');
* // => [['a', 'b'], [1, 2]]
*/
export default function partition<T>(arr: T[], resolver: (arg: T) => boolean): [T[], T[]]
declare function partition<T, S extends T>(arr: T[], resolver: (arg: T) => arg is S): [S[], Exclude<T, S>[]];
declare function partition<T>(arr: T[], resolver: (arg: T) => boolean): [T[], T[]]
export default partition;
9 changes: 8 additions & 1 deletion packages/array-partition/index.tests.ts
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Expand Up @@ -2,9 +2,12 @@ import partition from './index';

// OK
const test1: [number[], number[]] = partition([1, 5, 2, 4, 3], n => n > 3);
const test2: [string[], number[]] = partition(['a', 2, 3, '3'], x => typeof x == 'string') as [string[], number[]]; //if you know better than typescript
const test2: [string[], number[]] = partition(['a', 2, 3, '3'], (x): x is string => {
return typeof x === 'string';
});
const test3: [number[], number[]] = partition([1, 2, 3, 4], x => typeof x == 'string');
const test4: [unknown[], unknown[]] = partition([], n => n > 3); // [[], []]
const test5: [boolean[], number[]] = partition([1, true, 2, 3, true], isBoolean);

// Not OK
// @ts-expect-error
Expand All @@ -19,3 +22,7 @@ partition(null, n => n > 1);
partition(undefined, n => n > 1);
// @ts-expect-error
partition([1, 5, 2, 4, 3], n => n > 3, "a");

function isBoolean(x: unknown): x is boolean {
return typeof x === 'boolean';
}
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