### Defining a Select Form Field in Easypanel Builder Schema

Source: https://github.com/easypanel-io/builders/blob/main/README.md

This snippet provides an example of defining a 'select' type form field within an Easypanel builder's schema. It uses `oneOf` to specify a list of predefined options, each with an `enum` value and a display `title`.

```TypeScript
{
  // ...
  selectField: {
    type: "string",
    title: "Select Field",
    oneOf: [
      { enum: ["first"], title: "First Option" },
      { enum: ["second"], title: "Second Option" },
      { enum: ["third"], title: "Third Option" }
    ]
  }
}
```

--------------------------------

### Defining a Next.js Builder in Easypanel

Source: https://github.com/easypanel-io/builders/blob/main/README.md

This snippet demonstrates how to define a new builder for Easypanel using `createBuilder`. It includes a schema for user input (package manager, telemetry) and a `generate` function to produce Dockerfile content based on the input. The `as const` assertion is crucial for type inference.

```TypeScript
import { createBuilder, joinLines } from "~builders-utils";

export default createBuilder({
  name: "Next.js",
  schema: {
    type: "object",
    required: ["packageManager", "disableTelemetry"],
    properties: {
      packageManager: {
        type: "string",
        title: "Package Manager",
        oneOf: [
          { enum: ["npm"], title: "NPM" },
          { enum: ["yarn"], title: "Yarn" }
        ],
        default: "npm"
      },
      disableTelemetry: {
        type: "boolean",
        title: "Disable Telemetry",
        default: false
      }
    }
  } as const,
  generate({ packageManager, disableTelemetry }) {
    const dockerfileContent = joinLines([
      "// ...",
      "EXPOSE 3000",
      "ENV PORT 3000",
      "CMD [\"node\", \"server.js\"]"
    ]);

    return [{ name: "Dockerfile", content: dockerfileContent }];
  }
});
```

--------------------------------

### Transforming Error Messages in Easypanel Builders

Source: https://github.com/easypanel-io/builders/blob/main/README.md

This snippet illustrates how to use the `transformErrors` function in an Easypanel builder. It allows modifying default error messages based on their `name` (e.g., 'pattern' errors), providing more user-friendly feedback.

```TypeScript
{
  // ...
  transformErrors(errors) {
    return errors.map((error) => {
      if (error.name === "pattern") {
        error.message = "Only digits are allowed";
      }
      return error;
    });
  }
}
```

--------------------------------

### Implementing Custom Validation Rules for Easypanel Builders

Source: https://github.com/easypanel-io/builders/blob/main/README.md

This snippet shows how to add a custom `validate` function to an Easypanel builder. It receives `formData` and an `errors` object, allowing for custom validation logic, such as checking if two password fields match, and adding specific error messages.

```TypeScript
{
  // ...
  validate(formData, errors) {
    if (formData.pass1 !== formData.pass2) {
      errors.pass2.addError("Passwords don't match");
    }
    return errors;
  }
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.