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import type { LoadedEnvFiles } from '@next/env'
import { join } from 'node:path'
import { writeFile } from 'node:fs/promises'
export async function createEnvDefinitions({
distDir,
loadedEnvFiles,
}: {
distDir: string
loadedEnvFiles: LoadedEnvFiles
}) {
const envLines = []
const seenKeys = new Set()
// env files are in order of priority
for (const { path, env } of loadedEnvFiles) {
for (const key in env) {
if (!seenKeys.has(key)) {
envLines.push(` /** Loaded from \`${path}\` */`)
envLines.push(` ${key}?: string`)
seenKeys.add(key)
}
}
}
const envStr = envLines.join('\n')
const definitionStr = `// Type definitions for Next.js environment variables
declare global {
namespace NodeJS {
interface ProcessEnv {
${envStr}
}
}
}
export {}`
if (process.env.NODE_ENV === 'test') {
return definitionStr
}
try {
// we expect the types directory to already exist
const envDtsPath = join(distDir, 'types', 'env.d.ts')
// do not await, this is not essential for further process
writeFile(envDtsPath, definitionStr, 'utf-8')
} catch (e) {
console.error('Failed to write env.d.ts:', e)
}
}
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