Codemod mangles z.partial

[simon04]

import { z } from "zod/v4";

const Foo = z.object({
  foo: z.string(),
});

const xxx = z.partial(Foo).parse("xxx");

The result is

import * as v from "valibot";

const Foo = v.object({
  foo: v.string(),
});

const xxx = v.parse(v.partial(v), "xxx");

The expected result is

import * as v from "valibot";

const Foo = v.object({
  foo: v.string(),
});

const xxx = v.parse(v.partial(Foo), "xxx");

> pnpx @valibot/zod-to-valibot --version
jscodeshift: 17.3.0
 - babel: 7.29.7
 - babylon: 7.29.7
 - flow: 0.318.0
 - recast: 0.23.11

[dosubot]

This looks like a confirmed bug. The codemod's AST traversal in transformSchemasAndLinksHelper only recognizes method-chained patterns like schema.partial() or z.object(...).partial(), but misses standalone function calls like z.partial(Foo) where partial is called directly on the z namespace [1].

The transformPartial function itself is correctly implemented [2], but it's never invoked for standalone z.partial(schema) calls because the traversal logic filters them out — it enforces that CallExpression callees must be MemberExpression nodes in a method chain [3].

The existing test fixtures also only cover method-chaining patterns (Schema1.partial(), z.object(...).partial()) and have no cases for standalone z.partial(Foo) [4], confirming this pattern wasn't anticipated.

This likely affects other Zod methods that can also be called as standalone functions (e.g., z.required(), z.pick(), z.omit()).

To reply, just mention @dosu.

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