javascript 0.3.0

A JavaScript engine implementation in Rust
Documentation 
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// feature probe for 'FinalizationRegistry'
try {
  if (typeof FinalizationRegistry !== 'function') throw new Error('FinalizationRegistry missing');
  const fr = new FinalizationRegistry(function() {});
  if (!fr) throw new Error('FinalizationRegistry failed');
  console.log('OK');
} catch (e) {
  console.log('NO');
}