{"componentChunkName":"component---src-templates-handbook-tsx","path":"/docs/handbook/release-notes/typescript-1-1.html","result":{"data":{"markdownRemark":{"id":"24ff6f8a-594a-5ce3-958d-c030a8d462d6","excerpt":"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. Performance Improvements The 1.…","html":"

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.

\n
ts
function longest<function longest<T extends {
    length: number;
}>(a: T, b: T): TT (type parameter) T in longest<T extends {
    length: number;
}>(a: T, b: T): Textends { length:(property) length: number number }>(a:(parameter) a: T extends { length: number; } T,(type parameter) T in longest<T extends {
    length: number;
}>(a: T, b: T): T b:(parameter) b: T extends { length: number; } T)(type parameter) T in longest<T extends {
    length: number;
}>(a: T, b: T): T {\n  if (a.(parameter) a: T extends { length: number; }length (property) length: number>= b.(parameter) b: T extends { length: number; }length)(property) length: number {\n    return a(parameter) a: T extends { length: number; }\n  } else {\n    return b(parameter) b: T extends { length: number; }\n  }\n}\n\n//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////\n\n// longerArray is of type 'number[]'\nconst longerArray const longerArray: number[]= longest(function longest<number[]>(a: number[], b: number[]): number[]1, 2], [1, 2, 3])\n// longerString is of type 'string'\nconst longerString const longerString: "alice" | "bob"= longest(function longest<"alice" | "bob">(a: "alice" | "bob", b: "alice" | "bob"): "alice" | "bob"'alice', 'bob')\n// Error! Numbers don't have a 'length' property\nconst notOK const notOK: {
    length: number;
}= longest(function longest<{
    length: number;
}>(a: {
    length: number;
}, b: {
    length: number;
}): {
    length: number;
}10, 100)\nArgument of type '10' is not assignable to parameter of type '{ length: number; }'.2345Argument of type '10' is not assignable to parameter of type '{ length: number; }'.\nconst hello const hello: "alice" | "bob"= longest(function longest<"alice" | "bob">(a: "alice" | "bob", b: "alice" | "bob"): "alice" | "bob"'alice', 'bob')\nconsole.var console: Consolelog((method) Console.log(message?: any, ...optionalParams: any[]): voidhello)const hello: "alice" | "bob"
\n

Performance Improvements

\n

The 1.1 compiler is typically around 4x faster than any previous release. See this blog post for some impressive charts.

\n

Better Module Visibility Rules

\n

TypeScript now only strictly enforces the visibility of types in modules if the --declaration flag is provided. This is very useful for Angular scenarios, for example:

\n
ts
module MyControllers {\n  interface ZooScope extends ng.IScope {\n    animals: Animal[]\n  }\n  export class ZooController {\n    // Used to be an error (cannot expose ZooScope), but now is only\n    // an error when trying to generate .d.ts files\n    constructor(public $scope: ZooScope) {}\n    /* more code */\n  }\n}
","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"}}},"pageContext":{"slug":"/docs/handbook/release-notes/typescript-1-1.html","isOldHandbook":true}}}