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Use yarn --version to determine if modern yarn #3503

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f8de173
Use yarn --version to determine if modern yarn
ZhangYiJiang Mar 13, 2026
7400fc4
Remove catch, add small test
yzhang-stytch Mar 13, 2026
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26 changes: 25 additions & 1 deletion packages/build-tools/src/utils/__tests__/project.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ import { instance, mock, when } from 'ts-mockito';

import { BuildContext } from '../../context';
import { PackageManager } from '../packageManager';
import { readEasJsonContents, runExpoCliCommand } from '../project';
import { isUsingModernYarnVersion, readEasJsonContents, runExpoCliCommand } from '../project';

jest.mock('fs');
jest.mock('@expo/turtle-spawn', () => ({
Expand Down Expand Up @@ -87,3 +87,27 @@ describe(readEasJsonContents, () => {
expect(readEasJsonContents(projectDir)).toBe(contents);
});
});

describe(isUsingModernYarnVersion, () => {
const mockSpawn = spawn as jest.Mock;

beforeEach(() => {
mockSpawn.mockReset();
});

it('returns false for yarn 1.x', async () => {
mockSpawn.mockResolvedValue({ stdout: '1.22.22' });

const result = await isUsingModernYarnVersion('/project');

expect(result).toBe(false);
});

it('returns true for yarn 4.x', async () => {
mockSpawn.mockResolvedValue({ stdout: '4.13.0' });

const result = await isUsingModernYarnVersion('/project');

expect(result).toBe(true);
});
});
11 changes: 6 additions & 5 deletions packages/build-tools/src/utils/project.ts
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Expand Up @@ -2,15 +2,16 @@ import spawn, { SpawnOptions, SpawnPromise, SpawnResult } from '@expo/turtle-spa
import fs from 'fs-extra';
import path from 'path';

import { PackageManager, findPackagerRootDir } from '../utils/packageManager';
import { PackageManager } from '../utils/packageManager';

/**
* check if .yarnrc.yml exists in the project dir or in the workspace root dir
* Check if yarn version is 2 or later (modern yarn) by running `yarn --version`
*/
export async function isUsingModernYarnVersion(projectDir: string): Promise<boolean> {
const yarnrcPath = path.join(projectDir, '.yarnrc.yml');
const yarnrcRootPath = path.join(findPackagerRootDir(projectDir), '.yarnrc.yml');
return (await fs.pathExists(yarnrcPath)) || (await fs.pathExists(yarnrcRootPath));
const result = await spawn('yarn', ['--version'], { cwd: projectDir, stdio: 'pipe' });
const version = result.stdout.trim();
const majorVersion = parseInt(version.split('.')[0], 10);
return majorVersion >= 2;
}

export function runExpoCliCommand({
Expand Down
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