vite 5.4.14: loadEnv

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify vite.loadEnv in pkg:npm/vite@5.4.14
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite@5.4.14
Demonstrate these symbols/APIs:
  - vite.loadEnv

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:aa69869bfffbe0e89d4449f49248edf1f5103b2de6ebeb8955d9b5f4151659ad","contract":["loadEnv loads variables matching the default VITE_ prefix from .env and ignores un-prefixed variables","loadEnv overrides earlier env files with mode-specific and local files in cascading order","loadEnv accepts custom prefixes as string or array and loads matching variables","loadEnv supports dotenv-expand variable interpolation across files","loadEnv throws an Error when mode is named local"],"goal":"verify vite.loadEnv in pkg:npm/vite@5.4.14","kind":"HOW","packages":["pkg:npm/vite@5.4.14"],"schemaVersion":1,"symbols":["vite.loadEnv"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/vite@5.4.14"],"schemaVersion":1,"subject":"pkg:npm/vite@5.4.14","symbols":["vite.loadEnv"],"verifierAdapter":"node-typescript@1"}

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  "name": "sample-vite-loadenv",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vite-loadenv",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
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      }
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}

{
  "name": "sample-vite-loadenv",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vite": "5.4.14"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify vite.loadEnv in pkg:npm/vite@5.4.14",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite@5.4.14"
  ],
  "symbols": [
    "vite.loadEnv"
  ]
}

import { loadEnv } from 'vite';

/**
 * Loads environment variables for a given mode and directory with optional prefix filtering.
 *
 * @param {string} mode - The environment mode (e.g., 'development', 'production', 'staging').
 * @param {string} envDir - The directory containing the .env files.
 * @param {string | string[]} [prefixes='VITE_'] - Allowed prefix or array of prefixes.
 * @returns {Record<string, string>} Object containing the resolved environment variables.
 */
export function getLoadedEnv(mode, envDir, prefixes = 'VITE_') {
  return loadEnv(mode, envDir, prefixes);
}

export { loadEnv };
export default loadEnv;

import assert from 'node:assert/strict';
import fs from 'node:fs/promises';
import path from 'node:path';
import os from 'node:os';
import { loadEnv, getLoadedEnv } from '../src/index.mjs';

async function runContract() {
  const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'vite-loadenv-contract-'));

  try {
    // 1. loadEnv loads variables matching the default VITE_ prefix from .env and ignores un-prefixed variables
    {
      const envFile = path.join(tmpDir, '.env');
      await fs.writeFile(envFile, 'VITE_APP_TITLE=CodeSampleX\nSECRET_DATABASE_KEY=supersecret\n');

      const env = loadEnv('development', tmpDir);
      assert.equal(env.VITE_APP_TITLE, 'CodeSampleX');
      assert.equal(env.SECRET_DATABASE_KEY, undefined);

      const helperEnv = getLoadedEnv('development', tmpDir);
      assert.equal(helperEnv.VITE_APP_TITLE, 'CodeSampleX');
      assert.equal(helperEnv.SECRET_DATABASE_KEY, undefined);
    }

    // 2. loadEnv overrides earlier env files with mode-specific and local files in cascading order
    {
      const modeDir = path.join(tmpDir, 'cascade');
      await fs.mkdir(modeDir, { recursive: true });

      await fs.writeFile(
        path.join(modeDir, '.env'),
        'VITE_API_ENDPOINT=https://example.com/base\nVITE_ENV_LABEL=base\n'
      );
      await fs.writeFile(
        path.join(modeDir, '.env.production'),
        'VITE_API_ENDPOINT=https://example.com/production\nVITE_STAGE=production\n'
      );
      await fs.writeFile(
        path.join(modeDir, '.env.production.local'),
        'VITE_ENV_LABEL=prod-local\n'
      );

      const prodEnv = loadEnv('production', modeDir);
      assert.equal(prodEnv.VITE_API_ENDPOINT, 'https://example.com/production');
      assert.equal(prodEnv.VITE_ENV_LABEL, 'prod-local');
      assert.equal(prodEnv.VITE_STAGE, 'production');
    }

    // 3. loadEnv accepts custom prefixes as string or array and loads matching variables
    {
      const prefixDir = path.join(tmpDir, 'prefix');
      await fs.mkdir(prefixDir, { recursive: true });

      await fs.writeFile(
        path.join(prefixDir, '.env'),
        'VITE_ALPHA=1\nCUSTOM_BETA=2\nSHARED_GAMMA=3\n'
      );

      const singlePrefixEnv = loadEnv('development', prefixDir, 'CUSTOM_');
      assert.equal(singlePrefixEnv.CUSTOM_BETA, '2');
      assert.equal(singlePrefixEnv.VITE_ALPHA, undefined);
      assert.equal(singlePrefixEnv.SHARED_GAMMA, undefined);

      const multiPrefixEnv = loadEnv('development', prefixDir, ['VITE_', 'CUSTOM_']);
      assert.equal(multiPrefixEnv.VITE_ALPHA, '1');
      assert.equal(multiPrefixEnv.CUSTOM_BETA, '2');
      assert.equal(multiPrefixEnv.SHARED_GAMMA, undefined);

      const allEnv = loadEnv('development', prefixDir, '');
      assert.equal(allEnv.VITE_ALPHA, '1');
      assert.equal(allEnv.CUSTOM_BETA, '2');
      assert.equal(allEnv.SHARED_GAMMA, '3');
    }

    // 4. loadEnv supports dotenv-expand variable interpolation across files
    {
      const expandDir = path.join(tmpDir, 'expand');
      await fs.mkdir(expandDir, { recursive: true });

      await fs.writeFile(
        path.join(expandDir, '.env'),
        'BASE_NAME=app\nVITE_SERVICE_TITLE=service_${BASE_NAME}_v1\n'
      );

      const env = loadEnv('development', expandDir);
      assert.equal(env.VITE_SERVICE_TITLE, 'service_app_v1');
    }

    // 5. loadEnv throws an Error when mode is named local
    {
      assert.throws(
        () => loadEnv('local', tmpDir),
        (err) => err instanceof Error && err.message.includes('"local" cannot be used as a mode name')
      );
    }

    console.log('Contract tests passed successfully.');
  } finally {
    await fs.rm(tmpDir, { recursive: true, force: true });
  }
}

await runContract();