René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Design Meeting Notes, 1/4/2023","articleBody":"*Notes by @RyanCavanaugh*\r\n\r\n# `strictFunctionTypes` for our codebase\r\n\r\nhttps://github.com/microsoft/TypeScript/pull/49929\r\n\r\n* Most unsoundness is around visitor-like patterns\r\n* Performance of additional needed `checkDefined` calls is ~zero\r\n* Some possible inference issues identified, Jake will reduce offline\r\n  * Update: Fixed at #52123\r\n* Please code review, will merge for 5.0\r\n\r\n# Internal RWC Tests\r\n\r\n* What's the deal?\r\n    * These are internal (nonpublic) codebases\r\n* Do we need this?\r\n  * Probably not anymore\r\n  * These codebases are *ancient* and are affected by 5.0 changes\r\n* Would greatly prefer if external contributors could see all test collateral/results\r\n* Sufficient coverage from top100, user, etc\r\n  * Someone please write down the differences between all these\r\n* Let's remove\r\n\r\n# CI coverage in general\r\n\r\n* We need to be running ALL test suites on EVERY PR so we stop getting surprised\r\n* Please kick off these runs manually for now\r\n* TODO: Automate that\r\n* Performance testing\r\n* Current tests don't give an accurate statistical picture of what's happening\r\n* New perf tools tell you whether results are statistically significant or not, and to what degree\r\n* Getting apples-to-apples hardware is difficult\r\n* But we've inarguably \"drifted\" slower one unmeasurable step at a time\r\n  * Option 1: Measure the unmeasurable\r\n    * Pros: Would be good\r\n    * Cons: Not possible\r\n  * Option 2: Measure some proxy measure of performance instead (allocations, comparisons, clock cycles, etc)\r\n    * Pros: Discrete, no error bars\r\n    * Cons: Proxy measures might only roughly correlate\r\n  * Option 3: Measure release-to-release to keep tabs on how we're doing  \r\n    * Pros: Works\r\n    * Cons: Misses things when they happen\r\n* Consensus: Keep investigating perf and perf measures","author":{"url":"https://github.com/DanielRosenwasser","@type":"Person","name":"DanielRosenwasser"},"datePublished":"2023-01-06T20:44:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/52131/TypeScript/issues/52131"}