Make zod compatible with fp-ts non-empty constructs.
npm install zod-non-empty-array- Node.js v.16+
import { z as zod } from 'zod';
import { identity } from 'fp-ts/lib/function';
import * as NonEmptyArray from 'fp-ts/NonEmptyArray';
import { transformNonEmptyArray } from 'zod-non-empty-array';
// create zod schema
const schema = zod.object({
id: zod.number().int().positive(),
title: zod.string(),
authors: zod
.array(zod.string())
// must have at least one author
.transform(transformNonEmptyArray),
});
type Article = zod.infer<typeof schema>;
// parse some invalid value
const article = schema.parse({
id: 1,
title: 'A case-study of the use of fp-ts in a real-world project',
authors: ['John Doe', 'Jane Doe'],
});
// article.authors is now compatible with fp-ts
const principalAuthor = pipe(article.authors, NonEmptyArray.head);Zod already supports non-empty array validation. However, the generated type is incompatible with fp-ts.
Specifically, fp-ts defines NonEmptyArray as follows...
interface NonEmptyArray<T> extends Array<T> {
0: T;
}While, zod defines NonEmptyArray as follows...
type ZodNonEmptyArray<T> = [T, ...T[]];This incompatibility makes it difficult to integrate zod with fp-ts.
The zod-non-empty-array library addresses the incompatibility issue by exposing zod transformers that return fp-ts constructs. Instead of zod.array(...).nonempty() use zod.array(...).transform(transformNonEmptyArray).
- transformNonEmptyArray
- transformReadonlyNonEmptyArray
Source code contributions are most welcome. Please open a PR, ensure the linter is satisfied and all tests pass.
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MIT