@nestjs/cli/lib/utils/is-esm-project.js

Nest - modern, fast, powerful node.js web framework (@cli)

import { readFileSync } from 'fs';
import { join } from 'path';
/**
 * Detect whether the target project uses ESM output.
 * Checks the project's package.json for `"type": "module"`.
 */
export function isEsmProject(cwd = process.cwd()) {
    try {
        const raw = readFileSync(join(cwd, 'package.json'), 'utf-8');
        const pkg = JSON.parse(raw);
        return pkg.type === 'module';
    }
    catch {
        return false;
    }
}