vite 5.4.21: resolveConfig

audit=false

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.resolveConfig in pkg:npm/vite@5.4.21
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite@5.4.21
Demonstrate these symbols/APIs:
  - vite.resolveConfig

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:sha256:84ef429092122b6f8110d15a1df0f690625aae6085dda40c808b42e15222201b","contract":["resolveConfig resolves default configuration with normalized root, base path, and build output directory","resolveConfig sets command context and explicit mode in resolved configuration","resolveConfig normalizes custom base path ensuring leading and trailing slashes","resolveConfig invokes plugin config hooks in enforce order and merges returned configurations","resolveConfig invokes plugin configResolved hook with the final resolved configuration","resolveConfig respects configFile false preventing external configuration loading","resolveConfig normalizes alias configurations into resolve.alias collection"],"goal":"verify vite.resolveConfig in pkg:npm/vite@5.4.21","kind":"HOW","packages":["pkg:npm/vite@5.4.21"],"schemaVersion":1,"symbols":["vite.resolveConfig"]},"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@5.4.21"],"schemaVersion":1,"subject":"pkg:npm/vite@5.4.21","symbols":["vite.resolveConfig"],"verifierAdapter":"node-typescript@1"}

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  "name": "sample-vite-resolve-config",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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}

{
  "name": "sample-vite-resolve-config",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vite": "5.4.21"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify vite.resolveConfig in pkg:npm/vite@5.4.21",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite@5.4.21"
  ],
  "symbols": [
    "vite.resolveConfig"
  ]
}

import { resolveConfig } from 'vite';

/**
 * Resolves full Vite configuration for a given project root and command mode.
 *
 * @param {import('vite').InlineConfig} [inlineConfig={}] - Inline configuration overrides
 * @param {'build' | 'serve'} [command='build'] - Vite command context ('build' or 'serve')
 * @param {string} [defaultMode] - Default mode override ('development' or 'production')
 * @returns {Promise<import('vite').ResolvedConfig>} Fully resolved configuration
 */
export async function getResolvedConfig(inlineConfig = {}, command = 'build', defaultMode) {
  return resolveConfig(inlineConfig, command, defaultMode);
}

/**
 * Resolves Vite configuration with configFile disabled for programmatic usage.
 *
 * @param {import('vite').InlineConfig} [inlineConfig={}] - Additional configuration overrides
 * @param {'build' | 'serve'} [command='build'] - Vite command context
 * @returns {Promise<import('vite').ResolvedConfig>} Resolved configuration without file lookup
 */
export async function getProgrammaticConfig(inlineConfig = {}, command = 'build') {
  return resolveConfig({ ...inlineConfig, configFile: false }, command);
}

export { resolveConfig };
export default resolveConfig;

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

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

  try {
    // 1. resolveConfig resolves default configuration with normalized root, base path, and build output directory
    {
      const resolved = await resolveConfig({
        root: tmpDir,
        configFile: false,
        logLevel: 'silent'
      }, 'build');

      assert.equal(resolved.root, tmpDir);
      assert.equal(resolved.base, '/');
      assert.equal(resolved.command, 'build');
      assert.equal(resolved.build.outDir, 'dist');
    }

    // 2. resolveConfig sets command context and explicit mode in resolved configuration
    {
      const buildConfig = await resolveConfig({
        root: tmpDir,
        configFile: false,
        mode: 'staging',
        logLevel: 'silent'
      }, 'build');
      assert.equal(buildConfig.command, 'build');
      assert.equal(buildConfig.mode, 'staging');

      const serveConfig = await resolveConfig({
        root: tmpDir,
        configFile: false,
        logLevel: 'silent'
      }, 'serve');
      assert.equal(serveConfig.command, 'serve');
    }

    // 3. resolveConfig normalizes custom base path ensuring leading and trailing slashes
    {
      const resolved = await resolveConfig({
        root: tmpDir,
        base: 'custom/subpath',
        configFile: false,
        logLevel: 'silent'
      }, 'build');
      assert.equal(resolved.base, '/custom/subpath/');
    }

    // 4. resolveConfig invokes plugin config hooks in enforce order and merges returned configurations
    {
      const order = [];
      const prePlugin = {
        name: 'test-pre',
        enforce: 'pre',
        config() {
          order.push('pre');
          return {
            define: {
              __PRE_FLAG__: JSON.stringify('pre-value')
            }
          };
        }
      };

      const normalPlugin = {
        name: 'test-normal',
        config() {
          order.push('normal');
          return {
            define: {
              __NORMAL_FLAG__: JSON.stringify('normal-value')
            }
          };
        }
      };

      const resolved = await getResolvedConfig({
        root: tmpDir,
        configFile: false,
        logLevel: 'silent',
        plugins: [normalPlugin, prePlugin]
      }, 'build');

      assert.deepEqual(order, ['pre', 'normal']);
      assert.equal(resolved.define.__PRE_FLAG__, JSON.stringify('pre-value'));
      assert.equal(resolved.define.__NORMAL_FLAG__, JSON.stringify('normal-value'));
    }

    // 5. resolveConfig invokes plugin configResolved hook with the final resolved configuration
    {
      let hookCalled = false;
      let receivedConfig = null;

      const hookPlugin = {
        name: 'test-config-resolved',
        configResolved(resolvedConfig) {
          hookCalled = true;
          receivedConfig = resolvedConfig;
        }
      };

      const resolved = await resolveConfig({
        root: tmpDir,
        configFile: false,
        logLevel: 'silent',
        plugins: [hookPlugin]
      }, 'build');

      assert.equal(hookCalled, true);
      assert.equal(receivedConfig, resolved);
      assert.equal(receivedConfig.command, 'build');
    }

    // 6. resolveConfig respects configFile false preventing external configuration loading
    {
      const dummyConfigFile = path.join(tmpDir, 'vite.config.js');
      await fs.writeFile(
        dummyConfigFile,
        'export default { define: { __EXTERNAL_FILE_LOADED__: true } };\n'
      );

      const resolved = await getProgrammaticConfig({
        root: tmpDir,
        logLevel: 'silent'
      }, 'build');

      assert.equal(resolved.configFile, undefined);
      assert.deepEqual(resolved.configFileDependencies, []);
      assert.equal(resolved.define?.__EXTERNAL_FILE_LOADED__, undefined);
    }

    // 7. resolveConfig normalizes alias configurations into resolve.alias collection
    {
      const customAliasDir = path.resolve(tmpDir, 'src/components');
      const resolved = await resolveConfig({
        root: tmpDir,
        configFile: false,
        logLevel: 'silent',
        resolve: {
          alias: {
            '@components': customAliasDir
          }
        }
      }, 'build');

      assert(Array.isArray(resolved.resolve.alias));
      const matched = resolved.resolve.alias.find(
        (entry) => entry.find === '@components' && entry.replacement === customAliasDir
      );
      assert.ok(matched, 'Expected alias @components to be normalized in resolve.alias');
    }

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

await runContract();