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is a test example, knowingly shipped to prod while v2 is in beta - it’s got a really long comment and a twoslash error. Performance Improvements The 1.…","html":"<p>This is a test example, knowingly shipped to prod while v2 is in beta - it’s got a really long comment and a twoslash error.</p>\n<pre class=\"shiki twoslash\"><div class=\"language-id\">ts</div><div class='code-container'><code><span style=\"color: #0000FF\">function</span><span style=\"color: #000000\"> <data-lsp lsp='function longest&amp;lt;T extends {&amp;#13;    length: number;&amp;#13;}>(a: T, b: T): T'>longest</data-lsp>&lt;<data-lsp lsp='(type parameter) T in longest&amp;lt;T extends {&amp;#13;    length: number;&amp;#13;}>(a: T, b: T): T'>T</data-lsp> </span><span style=\"color: #0000FF\">extends</span><span style=\"color: #000000\"> { </span><span style=\"color: #1A1A1A\"><data-lsp lsp='(property) length: number'>length</data-lsp></span><span style=\"color: #000000\">: number }&gt;(</span><span style=\"color: #1A1A1A\"><data-lsp lsp='(parameter) a: T extends { length: number; }'>a</data-lsp></span><span style=\"color: #000000\">: <data-lsp lsp='(type parameter) T in longest&amp;lt;T extends {&amp;#13;    length: number;&amp;#13;}>(a: T, b: T): T'>T</data-lsp>, </span><span style=\"color: #1A1A1A\"><data-lsp lsp='(parameter) b: T extends { length: number; }'>b</data-lsp></span><span style=\"color: #000000\">: <data-lsp lsp='(type parameter) T in longest&amp;lt;T extends {&amp;#13;    length: number;&amp;#13;}>(a: T, b: T): T'>T</data-lsp>) {</span>\n<span style=\"color: #000000\">  </span><span style=\"color: #0000FF\">if</span><span style=\"color: #000000\"> (</span><span style=\"color: #1A1A1A\"><data-lsp lsp='(parameter) a: T extends { length: number; }'>a</data-lsp></span><span style=\"color: #000000\">.<data-lsp lsp='(property) length: number'>length</data-lsp> >= </span><span style=\"color: #1A1A1A\"><data-lsp lsp='(parameter) b: T extends { length: number; }'>b</data-lsp></span><span style=\"color: #000000\">.<data-lsp lsp='(property) length: number'>length</data-lsp>) {</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #0000FF\">return</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\"><data-lsp lsp='(parameter) a: T extends { length: number; }'>a</data-lsp></span><span style=\"color: #000000\">;</span>\n<span style=\"color: #000000\">  } </span><span style=\"color: #0000FF\">else</span><span style=\"color: #000000\"> {</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #0000FF\">return</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\"><data-lsp lsp='(parameter) b: T extends { length: number; }'>b</data-lsp></span><span style=\"color: #000000\">;</span>\n<span style=\"color: #000000\">  }</span>\n<span style=\"color: #000000\">}</span>\n\n<span style=\"color: #008000\">//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////</span>\n\n<span style=\"color: #008000\">// longerArray is of type &apos;number[]&apos;</span>\n<span style=\"color: #0000FF\">const</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\"><data-lsp lsp='const longerArray: number[]'>longerArray</data-lsp> </span><span style=\"color: #000000\">= <data-lsp lsp='function longest&amp;lt;number[]>(a: number[], b: number[]): number[]'>longest</data-lsp>([</span><span style=\"color: #09835A\">1</span><span style=\"color: #000000\">, </span><span style=\"color: #09835A\">2</span><span style=\"color: #000000\">], [</span><span style=\"color: #09835A\">1</span><span style=\"color: #000000\">, </span><span style=\"color: #09835A\">2</span><span style=\"color: #000000\">, </span><span style=\"color: #09835A\">3</span><span style=\"color: #000000\">]);</span>\n<span style=\"color: #008000\">// longerString is of type &apos;string&apos;</span>\n<span style=\"color: #0000FF\">const</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\"><data-lsp lsp='const longerString: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;'>longerString</data-lsp> </span><span style=\"color: #000000\">= <data-lsp lsp='function longest&amp;lt;&amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;>(a: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;, b: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;): &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;'>longest</data-lsp>(</span><span style=\"color: #A31515\">\"alice\"</span><span style=\"color: #000000\">, </span><span style=\"color: #A31515\">\"bob\"</span><span style=\"color: #000000\">);</span>\n<span style=\"color: #008000\">// Error! Numbers don&apos;t have a &apos;length&apos; property</span>\n<span style=\"color: #0000FF\">const</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\"><data-lsp lsp='const notOK: {&amp;#13;    length: number;&amp;#13;}'>notOK</data-lsp> </span><span style=\"color: #000000\">= <data-lsp lsp='function longest&amp;lt;{&amp;#13;    length: number;&amp;#13;}>(a: {&amp;#13;    length: number;&amp;#13;}, b: {&amp;#13;    length: number;&amp;#13;}): {&amp;#13;    length: number;&amp;#13;}'>longest</data-lsp>(</span><span style=\"color: #09835A\"><data-err>10</data-err></span><span style=\"color: #000000\">, </span><span style=\"color: #09835A\">100</span><span style=\"color: #000000\">);</span>\n<span class=\"error\"><span>Argument of type 'number' is not assignable to parameter of type '{ length: number; }'.</span><span class=\"code\">2345</span></span><span class=\"error-behind\">Argument of type 'number' is not assignable to parameter of type '{ length: number; }'.</span>\n<span style=\"color: #0000FF\">const</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\"><data-lsp lsp='const hello: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;'>hello</data-lsp> </span><span style=\"color: #000000\">= <data-lsp lsp='function longest&amp;lt;&amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;>(a: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;, b: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;): &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;'>longest</data-lsp>(</span><span style=\"color: #A31515\">\"alice\"</span><span style=\"color: #000000\">, </span><span style=\"color: #A31515\">\"bob\"</span><span style=\"color: #000000\">);</span>\n<span style=\"color: #000000\"><data-lsp lsp='var console: Console'>console</data-lsp>.<data-lsp lsp='(method) Console.log(...data: any[]): void'>log</data-lsp>(</span><span style=\"color: #1A1A1A\"><data-lsp lsp='const hello: &amp;quot;alice&amp;quot; | &amp;quot;bob&amp;quot;'>hello</data-lsp></span><span style=\"color: #000000\">);</span></code><a href='https://www.typescriptlang.org/play/#code/PTAEAEFMCdoe2gZwFygEwGYAsBWAUAGYCuAdgMYAuAlnCaADa0DmkiFAPACqiQAeFkEgBNEoAN4NBTCgAtUJIgFsARjFABfAHwAKAIapOAGlDKDASnF5QoKgVB6AdPSmzQmgLwmnLmRbFXrUGhICiJoOl0AbgD1HnpESEtAoJCwumVo63U8bLwQfILCouKS0rLyisqq6prqvDywRhIWaABBWF0ATxtRODsKToAHRIByBRUYAG0AXRG8Mlo2BmYYdugu0E8mljZtSYBGYzRp4wOj4wxps2iQZeaYAGUKaCpmntA+0AHh0BG2F+acwWJCW20ez1eTE2dx2FG0ACJdPQqGRIPDjPDlHBlPDrg1QABRWAIACEoAAckpVEhQEJaCMKKAZLoAG6JXS-ZzNWQjUCDeDDaADeaLRkkOAUADyAGloWDdvsAAzGJWKvEikGMmSQeiMOUrXaI5Go9GgTHY3HRYGIODOJxwJjabW6uDXIA'>Try</a></div></pre>\n<h2 id=\"performance-improvements\" style=\"position:relative;\"><a href=\"#performance-improvements\" aria-label=\"performance improvements permalink\" class=\"anchor before\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"16\" version=\"1.1\" viewBox=\"0 0 16 16\" width=\"16\"><path fill-rule=\"evenodd\" d=\"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\"></path></svg></a>Performance Improvements</h2>\n<p>The 1.1 compiler is typically around 4x faster than any previous release. See <a href=\"http://blogs.msdn.com/b/typescript/archive/2014/10/06/announcing-typescript-1-1-ctp.aspx\">this blog post for some impressive charts.</a></p>\n<h2 id=\"better-module-visibility-rules\" style=\"position:relative;\"><a href=\"#better-module-visibility-rules\" aria-label=\"better module visibility rules permalink\" class=\"anchor before\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"16\" version=\"1.1\" viewBox=\"0 0 16 16\" width=\"16\"><path fill-rule=\"evenodd\" d=\"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\"></path></svg></a>Better Module Visibility Rules</h2>\n<p>TypeScript now only strictly enforces the visibility of types in modules if the <code>--declaration</code> flag is provided. This is very useful for Angular scenarios, for example:</p>\n<pre class=\"shiki\"><div class=\"language-id\">ts</div><div class='code-container'><code><span style=\"color: #0000FF\">module</span><span style=\"color: #000000\"> MyControllers {</span>\n<span style=\"color: #000000\">  </span><span style=\"color: #0000FF\">interface</span><span style=\"color: #000000\"> ZooScope </span><span style=\"color: #0000FF\">extends</span><span style=\"color: #000000\"> ng.IScope {</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #1A1A1A\">animals</span><span style=\"color: #000000\">: Animal[];</span>\n<span style=\"color: #000000\">  }</span>\n<span style=\"color: #000000\">  </span><span style=\"color: #0000FF\">export</span><span style=\"color: #000000\"> </span><span style=\"color: #0000FF\">class</span><span style=\"color: #000000\"> ZooController {</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #008000\">// Used to be an error (cannot expose ZooScope), but now is only</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #008000\">// an error when trying to generate .d.ts files</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #0000FF\">constructor</span><span style=\"color: #000000\">(</span><span style=\"color: #0000FF\">public</span><span style=\"color: #000000\"> </span><span style=\"color: #1A1A1A\">$scope</span><span style=\"color: #000000\">: ZooScope) {}</span>\n<span style=\"color: #000000\">    </span><span style=\"color: #008000\">/* more code */</span>\n<span style=\"color: #000000\">  }</span>\n<span style=\"color: #000000\">}</span></code></div></pre>","headings":[{"value":"Performance Improvements","depth":2},{"value":"Better Module Visibility Rules","depth":2}],"frontmatter":{"permalink":"/docs/handbook/release-notes/typescript-1-1.html","title":"TypeScript 1.1","disable_toc":null,"oneline":"TypeScript 1.1 Release Notes"}},"prev":null,"next":null},"pageContext":{"id":"typescript-1.1","slug":"/docs/handbook/release-notes/typescript-1-1.html","repoPath":"/packages/documentation/copy/en/release-notes/TypeScript 1.1.md","lang":"en","modifiedTime":"2020-08-07T17:00:36.343Z"}}}