Upgrade zod to v4 for OpenCode v1.1.25 compatibility

[Copilot]

OpenCode v1.1.25's @opencode-ai/plugin requires [email protected], but this plugin depended on zod@^3.24.0. Since zod v3 and v4 are incompatible major versions, package managers cannot resolve this conflict, causing installation failures.

Changes

• Dependencies: Upgraded zod from ^3.24.0 to ^4.0.0 and zod-to-json-schema to ^3.25.1 (supports both v3 and v4)
• Schema generation: Replaced zodToJsonSchema() library call with zod v4's native toJSONSchema() method
• Version: Bumped to 1.3.1

- import { zodToJsonSchema } from "zod-to-json-schema";
- const jsonSchema = zodToJsonSchema(AntigravityConfigSchema, {
-   name: "AntigravityConfig",
-   $refStrategy: "none",
- }) as Record<string, unknown>;
+ // Use zod v4's built-in toJSONSchema method
+ const jsonSchema = AntigravityConfigSchema.toJSONSchema() as Record<string, unknown>;

All tests pass. No breaking changes to plugin API or behavior.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Dependency Conflict: Plugin incompatible with OpenCode v1.1.25 due to zod version mismatch</issue_title>
<issue_description># Dependency Conflict: Plugin incompatible with OpenCode v1.1.25 due to zod version mismatch

Summary

The plugin [email protected] is incompatible with OpenCode v1.1.25 because it requires zod@^3.24.0, while OpenCode's core @opencode-ai/[email protected] requires [email protected]. This creates an unresolvable dependency conflict that prevents OpenCode from starting.

Environment

• Plugin Version: 1.2.8
• OpenCode Version: 1.1.25
• Package Manager: Bun v1.3.5
• Operating System: macOS (Darwin 25.2.0) ARM64

The Conflict

Current Dependencies

[email protected] requires zod@^3.24.0
@opencode-ai/[email protected] (OpenCode core) requires [email protected]

Why This Is a Problem

• zod v3.x and v4.x are major breaking changes - They cannot be resolved simultaneously in the same dependency tree
• OpenCode binary has plugin version hardcoded - Users cannot easily upgrade to a different version
• Bun install fails - Cannot resolve the dependency conflict

Error Message

BunInstallFailedError for opencode-antigravity-auth version 1.2.8

Root Cause

OpenCode v1.1.25 has [email protected] hardcoded in its binary, and when it tries to install dependencies automatically, the conflicting zod versions cause installation to fail.

Related Issues

• OpenCode issue: BunInstallFailedError for [email protected] - Dependency conflict with zod versions anomalyco/opencode#9075

Proposed Solution

Option 1: Upgrade zod to v4.x (Recommended)

Update the plugin to use zod@^4.0.0 to match OpenCode's requirements.

Benefits:

• Compatible with OpenCode v1.1.25
• Latest zod version with improved performance and features
• Resolves the conflict completely

Option 2: Release v1.2.9 with zod v4

Keep v1.2.8 for backward compatibility, but release v1.2.9 with zod v4 support.

This allows:

• Older OpenCode versions to continue using v1.2.8
• OpenCode v1.1.25 to update to v1.2.9

Option 3: Peer Dependency

Make zod a peer dependency to allow consumers to choose the version.

Impact

Severity: High - Makes plugin completely unusable with current OpenCode version

Affected Users: Anyone using OpenCode v1.1.25 with this plugin

Additional Context

This plugin is essential for Google OAuth authentication (access to Gemini 3 Pro and Claude 4.5), so fixing this compatibility issue is critical for users who need Google authentication.

Thank you for maintaining this plugin!
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dependency Conflict: Plugin incompatible with OpenCode v1.1.25 due to zod version mismatch #223

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