Multiple schema configs in typegen only generates exports for the last layout

[HosakaKeigo]

Description

There seems to be a bug in the typegen tool where running it with multiple schema configurations results in only the last layout being exported in the client/index.ts file. All previous layouts' exports are lost.

The Problem

In the generateTypedClientsSingle function in packages/typegen/src/typegen.ts, the client/index.ts file is deleted at the beginning of each configuration processing:

// Current code (line 126-127)
const clientIndexFilePath = path.join(rootDir, "client", "index.ts");
fs.rmSync(clientIndexFilePath, { force: true }); // ensure clean slate for this file

This means when processing multiple configurations, each one deletes the index.ts file that was just populated by the previous configuration.

Reproduction Steps

1. Create a configuration with multiple schemas:

[
  {
    "clientSuffix": "Layout",
    "path": "./src/schema",
    "clearOldFiles": false,
    "envNames": {
      "auth": {
        "username": "FM_USERNAME",
        "password": "FM_PASSWORD"
      },
      "server": "MyFMServer",
      "db": "FM_DATABASE_AB"
    },
    "layouts": [
      {
        "schemaName": "MySchema",
        "layoutName": "MyLayout"
      }
    ],
    "validator": "zod/v3"
  },
  {
    "clientSuffix": "Layout",
    "path": "./src/schema",
    "clearOldFiles": false,
    "envNames": {
      "auth": {
        "username": "FM_USERNAME",
        "password": "FM_PASSWORD"
      },
      "server": "MyFMServer",
      "db": "FM_DATABASE_CD"
    },
    "layouts": [
      {
        "schemaName": "MySchema3",
        "layoutName": "MyLayout3"
      }
    ],
    "validator": "zod/v3"
  }
]

2. Run typegen
3. Check src/schema/client/index.ts

Current Behavior

The generated index.ts file contains only:

export { client as MySchema3Layout } from "./MySchema3.js";

The export for MySchemaLayout is missing.

Expected Behavior

The generated index.ts file should contain exports for all layouts:

export { client as MySchemaLayout } from "./MySchema.js";
export { client as MySchema3Layout } from "./MySchema3.js";

Root Cause

The issue occurs because:

1. generateTypedClients loops through each config and calls generateTypedClientsSingle
2. Each call to generateTypedClientsSingle deletes the client/index.ts file at the start
3. Previous exports are lost when the file is deleted

Proposed Solution

Move the index.ts deletion to the top-level generateTypedClients function to ensure it's only deleted once at the beginning of the entire process:

1. In generateTypedClients, delete the index.ts files once for all unique paths before processing any configs
2. Remove the fs.rmSync(clientIndexFilePath, { force: true }) line from generateTypedClientsSingle

Related Code Lines

• proofkit/packages/typegen/src/typegen.ts

  Line 26 in f8e4711

  export const generateTypedClients = async (

• proofkit/packages/typegen/src/typegen.ts

  Line 129 in f8e4711

  fs.rmSync(clientIndexFilePath, { force: true }); // ensure clean slate for this file