JSDoc optional/required variant doesn't play well with multi-@param RecordType declarations

TypeScript Version: 2.9.0-dev.20180330

Search Terms: as mentioned in this comment, I'm opening this issue because with this JSDoc syntax typescript doesn't recognize the params correctly.

Code

// A *self-contained* demonstration of the problem follows...
// Test this by running `tsc` on the command-line, rather than through another build tool such as Gulp, Webpack, etc.

/**
 * @param {!object} args 
 * @param {!string} args.prop1
 * @param {?string} args.prop2
 */
function patate(args) {
  const { prop1, prop2 } = args;
} 

Expected behavior: No errors

Actual behavior: With allowJs and checkJs, I get JSDoc '@param' tag has name 'prop1', but is no parameter with that name.

Playground Link:

Related Issues: https://github.com/Microsoft/TypeScript/issues/19645

Inizia con l’esempio JavaScript autonomo nell’issue ed esegui tsc con allowJs e checkJs abilitati. Verifica come il compilatore gestisce la dichiarazione JSDoc con più @param; il lavoro è completato quando l’esempio non produce alcuna diagnostica per args.prop1 o args.prop2.