Ting/fix generator for chained calls

[tinglei8]

This fix solves an issue of properly flattening zod schemas referenced in chained function calls.

An example:

import { z } from 'zod';

const TypeEnum = z
  .enum(['Normal', 'Unknown'])
  .describe('Type of the item');

const FindManyInput = z.object({
  options: z
    .object({
      userId: z.string().describe('ID of the current user'),
      type1: TypeEnum.optional().describe('Type 1 of the item')
    })
    .merge({
      z.object({
        type2: TypeEnum.optional().describe('Type 2 of the item')
      })
    })
    .describe('Options to find many items'),
});

Before the fix, references to TypeEnum are not flattened in FindManyInput because it's referenced as parameters of the object() and merge() calls instead of the last describe() call.

After the fix, The TypeEnum schema is properly flattened in all places that reference it.

[vercel]

@tinglei8 is attempting to deploy a commit to the Kevin's Projects Team on Vercel.

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[tinglei8]

Closed because #59 contains it