[build-utils] Add zero config detection for bun package manager

.changeset/poor-cobras-deliver.md

@@ -0,0 +1,5 @@
+---
+"@vercel/build-utils": minor
+---
+
+[build-utils] Add zero config detection for bun package manager

packages/build-utils/src/fs/run-user-scripts.ts

@@ -16,7 +16,7 @@ import { cloneEnv } from '../clone-env';
 // Only allow one `runNpmInstall()` invocation to run concurrently
 const runNpmInstallSema = new Sema(1);
 
-export type CliType = 'yarn' | 'npm' | 'pnpm';
+export type CliType = 'yarn' | 'npm' | 'pnpm' | 'bun';
 
 export interface ScanParentDirsResult {
   /**
@@ -284,26 +284,34 @@ export async function scanParentDirs(
     readPackageJson && pkgJsonPath
       ? JSON.parse(await fs.readFile(pkgJsonPath, 'utf8'))
       : undefined;
-  const [yarnLockPath, npmLockPath, pnpmLockPath] = await walkParentDirsMulti({
-    base: '/',
-    start: destPath,
-    filenames: ['yarn.lock', 'package-lock.json', 'pnpm-lock.yaml'],
-  });
+  const [yarnLockPath, npmLockPath, pnpmLockPath, bunLockPath] =
+    await walkParentDirsMulti({
+      base: '/',
+      start: destPath,
+      filenames: [
+        'yarn.lock',
+        'package-lock.json',
+        'pnpm-lock.yaml',
+        'bun.lockb',
+      ],
+    });
   let lockfilePath: string | undefined;
   let lockfileVersion: number | undefined;
   let cliType: CliType = 'yarn';
 
-  const [hasYarnLock, packageLockJson, pnpmLockYaml] = await Promise.all([
-    Boolean(yarnLockPath),
-    npmLockPath
-      ? readConfigFile<{ lockfileVersion: number }>(npmLockPath)
-      : null,
-    pnpmLockPath
-      ? readConfigFile<{ lockfileVersion: number }>(pnpmLockPath)
-      : null,
-  ]);
-
-  // Priority order is Yarn > pnpm > npm
+  const [hasYarnLock, packageLockJson, pnpmLockYaml, bunLockBin] =
+    await Promise.all([
+      Boolean(yarnLockPath),
+      npmLockPath
+        ? readConfigFile<{ lockfileVersion: number }>(npmLockPath)
+        : null,
+      pnpmLockPath
+        ? readConfigFile<{ lockfileVersion: number }>(pnpmLockPath)
+        : null,
+      bunLockPath ? fs.readFile(bunLockPath, 'utf8') : null,
+    ]);
+
+  // Priority order is Yarn > pnpm > npm > bun
   if (hasYarnLock) {
     cliType = 'yarn';
     lockfilePath = yarnLockPath;
@@ -315,6 +323,11 @@ export async function scanParentDirs(
     cliType = 'npm';
     lockfilePath = npmLockPath;
     lockfileVersion = packageLockJson.lockfileVersion;
+  } else if (bunLockBin) {
+    cliType = 'bun';
+    lockfilePath = bunLockPath;
+    // TODO: read "bun-lockfile-format-v0"
+    lockfileVersion = 0;
   }
 
   const packageJsonPath = pkgJsonPath || undefined;
@@ -451,6 +464,10 @@ export async function runNpmInstall(
       commandArgs = args
         .filter(a => a !== '--prefer-offline')
         .concat(['install', '--unsafe-perm']);
+    } else if (cliType === 'bun') {
+      // @see options https://bun.sh/docs/cli/install
+      opts.prettyCommand = 'bun install';
+      commandArgs = ['install', ...args];
     } else {
       opts.prettyCommand = 'yarn install';
       commandArgs = ['install', ...args];
@@ -505,6 +522,7 @@ export function getEnvForPackageManager({
   const npm7 = '/node16/bin-npm7';
   const pnpm7 = '/pnpm7/node_modules/.bin';
   const pnpm8 = '/pnpm8/node_modules/.bin';
+  const bun1 = '/bun1';
   const corepackEnabled = env.ENABLE_EXPERIMENTAL_COREPACK === '1';
   if (cliType === 'npm') {
     if (
@@ -516,7 +534,7 @@ export function getEnvForPackageManager({
     ) {
       // Ensure that npm 7 is at the beginning of the `$PATH`
       newEnv.PATH = `${npm7}${path.delimiter}${oldPath}`;
-      console.log('Detected `package-lock.json` generated by npm 7+...');
+      console.log('Detected `package-lock.json` generated by npm 7+');
     }
   } else if (cliType === 'pnpm') {
     if (
@@ -528,7 +546,7 @@ export function getEnvForPackageManager({
       // Ensure that pnpm 7 is at the beginning of the `$PATH`
       newEnv.PATH = `${pnpm7}${path.delimiter}${oldPath}`;
       console.log(
-        `Detected \`pnpm-lock.yaml\` version ${lockfileVersion} generated by pnpm 7...`
+        `Detected \`pnpm-lock.yaml\` version ${lockfileVersion} generated by pnpm 7`
       );
     } else if (
       typeof lockfileVersion === 'number' &&
@@ -539,7 +557,16 @@ export function getEnvForPackageManager({
       // Ensure that pnpm 8 is at the beginning of the `$PATH`
       newEnv.PATH = `${pnpm8}${path.delimiter}${oldPath}`;
       console.log(
-        `Detected \`pnpm-lock.yaml\` version ${lockfileVersion} generated by pnpm 8...`
+        `Detected \`pnpm-lock.yaml\` version ${lockfileVersion} generated by pnpm 8`
+      );
+    }
+  } else if (cliType === 'bun') {
+    if (!oldPath.includes(bun1) && !corepackEnabled) {
+      // Ensure that Bun 1 is at the beginning of the `$PATH`
+      newEnv.PATH = `${bun1}${path.delimiter}${oldPath}`;
+      console.log('Detected `bun.lockb` generated by Bun');
+      console.warn(
+        'Warning: Bun is used as a package manager at build time only, not at runtime with Functions'
       );
     }
   } else {
@@ -548,7 +575,6 @@ export function getEnvForPackageManager({
       newEnv.YARN_NODE_LINKER = 'node-modules';
     }
   }
-
   return newEnv;
 }
 
@@ -614,6 +640,8 @@ export async function runPackageJsonScript(
     opts.prettyCommand = `npm run ${scriptName}`;
   } else if (cliType === 'pnpm') {
     opts.prettyCommand = `pnpm run ${scriptName}`;
+  } else if (cliType === 'bun') {
+    opts.prettyCommand = `bun run ${scriptName}`;
   } else {
     opts.prettyCommand = `yarn run ${scriptName}`;
   }

packages/build-utils/test/fixtures/30-bun-v1/.gitignore

@@ -0,0 +1,2 @@
+.vercel
+public

packages/build-utils/test/fixtures/30-bun-v1/build.js

@@ -0,0 +1,8 @@
+import { mkdir, rm, writeFile } from 'node:fs/promises'
+import { say } from 'cowsay'
+
+const text = say({ text: `bun version: ${process.versions.bun}` })
+const content = say({ text })
+await rm('./public', { recursive: true, force: true })
+await mkdir('./public', { recursive: true })
+await writeFile('./public/index.txt', content)

packages/build-utils/test/fixtures/30-bun-v1/package.json

@@ -0,0 +1,9 @@
+{
+  "private": true,
+  "scripts": {
+    "build": "bun build.js"
+  },
+  "dependencies": {
+    "cowsay": "1.5.0"
+  }
+}

packages/build-utils/test/fixtures/30-bun-v1/probes.json

@@ -0,0 +1,8 @@
+{
+  "probes": [
+    {
+      "path": "/",
+      "mustContain": "bun version: 1"
+    }
+  ]
+}

packages/build-utils/test/unit.get-env-for-package-manager.test.ts

@@ -133,6 +133,22 @@ describe('Test `getEnvForPackageManager()`', () => {
         PATH: `/pnpm7/node_modules/.bin${delimiter}foo`,
       },
     },
+    {
+      name: 'should set path if bun v1 is detected',
+      args: {
+        cliType: 'bun',
+        nodeVersion: { major: 18, range: '18.x', runtime: 'nodejs18.x' },
+        lockfileVersion: 0,
+        env: {
+          FOO: 'bar',
+          PATH: '/usr/local/bin',
+        },
+      },
+      want: {
+        FOO: 'bar',
+        PATH: `/bun1${delimiter}/usr/local/bin`,
+      },
+    },
     {
       name: 'should not set pnpm path if corepack is enabled',
       args: {

packages/build-utils/test/unit.test.ts

@@ -540,6 +540,15 @@ it(
   ms('1m')
 );
 
+it('should return cliType bun and correct lock file for bun v1', async () => {
+  const fixture = path.join(__dirname, 'fixtures', '30-bun-v1');
+  const result = await scanParentDirs(fixture);
+  expect(result.cliType).toEqual('bun');
+  expect(result.lockfileVersion).toEqual(0);
+  expect(result.lockfilePath).toEqual(path.join(fixture, 'bun.lockb'));
+  expect(result.packageJsonPath).toEqual(path.join(fixture, 'package.json'));
+});
+
 it('should return lockfileVersion 2 with npm7', async () => {
   const fixture = path.join(__dirname, 'fixtures', '20-npm-7');
   const result = await scanParentDirs(fixture);