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  1. PO
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    <p>Interestingly, Google Closure Compiler has <a href="https://developers.google.com/closure/compiler/docs/js-for-compiler#generics" rel="nofollow">support for generic types</a>, with a syntax like this:</p> <pre><code>/** * @constructor * @template T */ Foo = function() { ... }; /** @return {T} */ Foo.prototype.get = function() { ... }; /** @param {T} t */ Foo.prototype.set = function(t) { ... }; /** @type {!Foo.&lt;string&gt;} */ var foo = new Foo(); var foo = /** @type {!Foo.&lt;string&gt;} */ (new Foo()); </code></pre> <p>As JSDuck <a href="https://github.com/senchalabs/jsduck/wiki/Type-Definitions" rel="nofollow">already supports</a> Closure Compiler style type annotations, it should be already possible to write types like <code>{MyClass.&lt;T&gt;}</code>. JSDuck doesn't however uses a <a href="https://github.com/senchalabs/jsduck/wiki/%40template" rel="nofollow">@template tag</a> for a different purpose altogether, but one implement its own custom tag like <code>@typevar</code> or override the builtin <code>@template</code> to do your bidding using the <a href="https://github.com/senchalabs/jsduck/wiki/Custom-tags" rel="nofollow">custom tags system</a>.</p> <p>But as there is no actual generic types support in JSDuck, it won't check your generic types. On the contrary, it will probably complain, that you're referencing an unknown type <code>T</code> and others. But it's easy to make JSDuck ignore certain types (or type variables) by using <code>--external=T</code>.</p> <p>One final note. The Closure Compiler doesn't support your <code>extends</code> syntax in type variables, and I don't really see why would you write <code>T extends Bird</code> and then <code>{MyArray&lt;T&gt;}</code>, instead of just writing <code>{MyArray&lt;Bird&gt;}</code>.</p>
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    1. POIs there a way to define generic types in JS documentation?
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    1. USRene Saarsoo
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    1. COThank you for information. I won't go with custom tags, because generic types logic is pretty complicated in all programming languages. It can be a big project. Your suggestion about `--external=T` is very useful.
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      1. USEgor Nepomnyaschih
    2. COThe reason to write `BirdArray<T extends Bird>` is that you can define explicit `BirdArray<Duck>` in this implementation instead of just abstract `BirdArray`.
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      1. USEgor Nepomnyaschih
 

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