{"action":"created","comment":{"url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/comments/67068844","id":67068844,"diff_hunk":"@@ -11975,6 +11975,10 @@ namespace ts {\n             // Variables declared with 'const'\r\n             // Get accessors without matching set accessors\r\n             // Enum members\r\n+            // Unions and intersections of the above\r\n+            if (symbol.flags & SymbolFlags.SyntheticProperty) {\r\n+                return forEach(symbol.declarations, decl => isReadonlySymbol(getSymbolOfNode(decl)));\r\n+            }\r","path":"src/compiler/checker.ts","position":7,"original_position":7,"commit_id":"931839c84294d7ec9618fd506098ce019d3c4904","original_commit_id":"931839c84294d7ec9618fd506098ce019d3c4904","user":{"login":"ahejlsberg","id":4226954,"avatar_url":"https://avatars.githubusercontent.com/u/4226954?v=3","gravatar_id":"","url":"https://api.github.com/users/ahejlsberg","html_url":"https://github.com/ahejlsberg","followers_url":"https://api.github.com/users/ahejlsberg/followers","following_url":"https://api.github.com/users/ahejlsberg/following{/other_user}","gists_url":"https://api.github.com/users/ahejlsberg/gists{/gist_id}","starred_url":"https://api.github.com/users/ahejlsberg/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ahejlsberg/subscriptions","organizations_url":"https://api.github.com/users/ahejlsberg/orgs","repos_url":"https://api.github.com/users/ahejlsberg/repos","events_url":"https://api.github.com/users/ahejlsberg/events{/privacy}","received_events_url":"https://api.github.com/users/ahejlsberg/received_events","type":"User","site_admin":false},"body":"This could probably be more efficient. When a symbol has multiple declarations (such as an overloaded method) we'll end up doing the same check multiple times even though the outcome is always false. Ideally we'd have a `SymbolFlags.Readonly` that we compute in the same way as `SymbolFlags.Optional`, but we're out of flag bits. Perhaps it would be better to compute the readonly state in `createUnionOrIntersectionProperty` (but calling `isReadonlySymbol` for each underlying symbol) and then record the result in an `isReadonly` property on the symbol itself.","created_at":"2016-06-14T22:23:07Z","updated_at":"2016-06-14T22:23:07Z","html_url":"https://github.com/Microsoft/TypeScript/pull/9167#discussion_r67068844","pull_request_url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/9167","_links":{"self":{"href":"https://api.github.com/repos/Microsoft/TypeScript/pulls/comments/67068844"},"html":{"href":"https://github.com/Microsoft/TypeScript/pull/9167#discussion_r67068844"},"pull_request":{"href":"https://api.github.com/repos/Microsoft/TypeScript/pulls/9167"}}},"pull_request":{"url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/9167","id":73807965,"html_url":"https://github.com/Microsoft/TypeScript/pull/9167","diff_url":"https://github.com/Microsoft/TypeScript/pull/9167.diff","patch_url":"https://github.com/Microsoft/TypeScript/pull/9167.patch","issue_url":"https://api.github.com/repos/Microsoft/TypeScript/issues/9167","number":9167,"state":"open","locked":false,"title":"Unions and intersections of readonly properties are now also readonly","user":{"login":"sandersn","id":293473,"avatar_url":"https://avatars.githubusercontent.com/u/293473?v=3","gravatar_id":"","url":"https://api.github.com/users/sandersn","html_url":"https://github.com/sandersn","followers_url":"https://api.github.com/users/sandersn/followers","following_url":"https://api.github.com/users/sandersn/following{/other_user}","gists_url":"https://api.github.com/users/sandersn/gists{/gist_id}","starred_url":"https://api.github.com/users/sandersn/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sandersn/subscriptions","organizations_url":"https://api.github.com/users/sandersn/orgs","repos_url":"https://api.github.com/users/sandersn/repos","events_url":"https://api.github.com/users/sandersn/events{/privacy}","received_events_url":"https://api.github.com/users/sandersn/received_events","type":"User","site_admin":false},"body":"Fixes #9108 \r\n\r\n@ahejlsberg can you take a look to confirm that this is how readonly should work with unions and intersections of 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