import { z } from "zod"
import { readResourceFile } from "../_internal/resource-path.js"
import { execSync } from "child_process"
import {
detectProjectChannel,
processConditionalBlocks,
} from "../_internal/nextjs-channel-detector.js"
export const inputSchema = {
project_path: z
.string()
.optional()
.describe("Path to the Next.js project (defaults to current directory)"),
}
type UpgradeNextjs16PromptArgs = {
project_path?: string
}
export const metadata = {
name: "upgrade-nextjs-16",
title: "upgrade-nextjs-16",
description:
"Guide through upgrading Next.js to version 16. CRITICAL: Runs the official codemod FIRST (requires clean git state) for automatic upgrades and fixes, then handles remaining issues manually. The codemod upgrades Next.js, React, and React DOM automatically. Covers async API changes, config moves, image defaults, parallel routes, and deprecations.",
role: "user",
}
function checkNextjs16Availability(): { channel: "latest"; version: string } {
try {
const latestVersion = execSync("npm view next version", { encoding: "utf-8" }).trim()
return { channel: "latest", version: latestVersion }
} catch (error) {
console.warn(
"Failed to check Next.js version from npm registry, defaulting to latest channel assumption"
)
return { channel: "latest", version: "unknown" }
}
}
export function handler(args: UpgradeNextjs16PromptArgs): string {
const projectPath = args.project_path || process.cwd()
const { version } = checkNextjs16Availability()
const upgradeChannel = "latest"
const codemodCommandNote = `**Note**: Next.js 16 stable (version ${version}) is now available.`
// Detect if project is on beta/canary
const { isBeta } = detectProjectChannel(projectPath)
let promptTemplate = readResourceFile("prompts/upgrade-nextjs-16-prompt.md")
// Replace basic template variables
promptTemplate = promptTemplate.replace(/{{PROJECT_PATH}}/g, projectPath)
promptTemplate = promptTemplate.replace(/{{UPGRADE_CHANNEL}}/g, upgradeChannel)
promptTemplate = promptTemplate.replace(/{{CODEMOD_COMMAND}}/g, codemodCommandNote)
// Process conditional blocks based on project channel
promptTemplate = processConditionalBlocks(promptTemplate, isBeta)
return promptTemplate
}
