php-codesniffer 

Executes phpcs over a given file(s) and return results as JSON.
Written in TypeScript, good test coverage, no dependencies.

``ts
import { version, lint } from './linter';

it('returns version', async () => {
expect(await version('php ./test/phpcs.phar')).toBe('3.5.5');
expect(semver.valid(await version())).toBeTruthy();
});

it('lints several files', async () => {
const res = await lint(
'./test/fixtures/test1.php ./test/fixtures/test2.php',
undefined,
{
standard: path.resolve(
__dirname,
'../test/preferBeautifierConfig/subFolder/phpcs.xml',
),
},
);
expect(res.totals).toMatchInlineSnapshot(
Object {
"errors": 13,
"fixable": 13,
"warnings": 1,
}
);
expect(Object.values(res.files)).toMatchSnapshot();
});
``

$3

MIT