build-native.js

const { exec } = require('child_process');
const semver = require('semver');

exec('tns --version', (err, stdout, stderr) => {
  if (err) {
    // node couldn't execute the command
    console.log(`tns --version err: ${err}`);
    return;
  }

  const tnsVersion = semver.major(stdout);

  // execute 'tns plugin build' for {N} version > 4. This command builds .aar in platforms/android folder.
  if (tnsVersion >= 4) {
    console.log(`executing 'tns plugin build'`);
    exec('tns plugin build');
  }
});