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not just `--strict`?","created_at":"2018-04-24T17:07:37Z","updated_at":"2018-04-24T17:07:37Z","html_url":"https://github.com/Microsoft/TypeScript/pull/22088#discussion_r183810721","pull_request_url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/22088","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/Microsoft/TypeScript/pulls/comments/183810721"},"html":{"href":"https://github.com/Microsoft/TypeScript/pull/22088#discussion_r183810721"},"pull_request":{"href":"https://api.github.com/repos/Microsoft/TypeScript/pulls/22088"}}},"pull_request":{"url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/22088","id":170557360,"html_url":"https://github.com/Microsoft/TypeScript/pull/22088","diff_url":"https://github.com/Microsoft/TypeScript/pull/22088.diff","patch_url":"https://github.com/Microsoft/TypeScript/pull/22088.patch","issue_url":"https://api.github.com/repos/Microsoft/TypeScript/issues/22088","number":22088,"state":"open","locked":false,"title":"Enable 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appropriate.\r\n* Adding `!` in many places\r\n\t- Particularly on optional members of interfaces like `Symbol` and `Type`.\r\n\t- Also, flags enums are often used as `E | undefined`, so we need to write `e! & E.SomeFlag`.\r\n\t- The `no-unnecessary-type-assertion` lint rule ensures that these are only added where necessary.\r\n\t- Suspicious uses of `!` are marked with #18217.\r\n* Adding `!!` to make expressions be `boolean` instead of `boolean | undefined`.\r\n\t- Also sometimes need to add `= false` to initialize the boolean.\r\n\t- Also change `condition && optional` to `condition ? optional : undefined` to avoid getting a `Optional | undefined | false`.\r\n* Change `Debug.fail()` to `return Debug.fail()` to tell the compiler that we definitely return from a 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