@netlify/framework-info/lib/run_script.js

Framework detection utility

import { dirname } from 'path';
// Retrieve the command to run `package.json` `scripts` commands
export const getRunScriptCommand = async function ({ pathExists, packageJsonPath, }) {
    const yarnExists = await pathExists(`${dirname(packageJsonPath)}/yarn.lock`);
    if (yarnExists) {
        return 'yarn';
    }
    return 'npm run';
};