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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"componentWillMount and friends deprecated from React","articleBody":"componentWillMount (before_mount callback), componentWillUpdate (before_update callback), componentWillReceiveProps (before_new_params callback) have been deprecated.\r\n\r\nHere is the plan to replace the first two:\r\n\r\n### `before_mount`\r\n\r\nThe before_mount callback can be implemented as part of the render_wrapper method, so the callbacks get called just before calling the application render method.  \r\n\r\n### `before_update`\r\n\r\nThe before_update callback can be implemented the same as before_mount, however, React did pass the \"old-state\" and \"new-state\" values to the callback.  This notion is meaningless in Hyperstack, but there possibly could be code around that is using the lower level \"props\" and is depending on the old-state and new-state.  \r\n\r\nSo for now we will use the react UNSAFE_componentWillUpdate callback (which gives no warning, but implements the legacy behavior, then in the callback we will check if the proc is receiving any parameters, and if so publish a deprecation notice that in the future these parameters will NOT be passed.\r\n\r\nThen at some future release, the code will use the same mechanism as before_mount (i.e. it's just part of the render wrapper)\r\n\r\n### `before_new_params`\r\n\r\nThis is sort of being replaced by a static (read class level) call back called `getDerivedStateFromProps` but the whole thing is probably unnecessary in hyperstack since the hyper-state component manages state changes to avoid rerenders (which is the base reason for this being replaced.)\r\n\r\nSo we will just deprecate this method.\r\n\r\n\r\n","author":{"url":"https://github.com/catmando","@type":"Person","name":"catmando"},"datePublished":"2021-03-10T16:50:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/373/hyperstack/issues/373"}