`Readonly<T>` not assignable to `T` with optional properties

`Readonly<T>` not assignable to `T` with optional properties

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BugA bug in TypeScript FixedA PR has been merged for this issue

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TypeScript 2.1.4

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on Nov 28, 2016

type T = { a? : number, b: string };
var y: T;
var x: Readonly<T> = y; // Error: Property 'a' is optional

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ahejlsberg

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BugA bug in TypeScript FixedA PR has been merged for this issue

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TypeScript 2.1.4

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