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We can only render one direction at a time with View Transitions. When the direction changes we need to do another render in the new direction (returning previous or next). To determine direction we store the position we started at and anything moving to a lower value (left/up) is "previous" direction (`false`) and anything else is "next" (`true`) direction. For the very first render we won't know which direction you're going since you're still on the initial position. It's useful to start the render to allow the view transition to take control before anything shifts around so we start from the original position. This is not guaranteed though if the render suspends. For now we start the first render by guessing the direction such as if we know that prev/next are the same as current. With the upcoming auto start mode we can guess more accurately there before we start. We can also add explicit APIs to `startGesture` but ideally it wouldn't matter. Ideally we could just start after the first change in direction from the starting point. |
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| .. | ||
| __tests__ | ||
| codes.json | ||
| extract-errors.js | ||
| invertObject.js | ||
| README.md | ||
| transform-error-messages.js | ||
| Types.js | ||
The error code system substitutes React's error messages with error IDs to provide a better debugging support in production. Check out the blog post here.
codes.jsoncontains the mapping from IDs to error messages. This file is generated by the Gulp plugin and is used by both the Babel plugin and the error decoder page in our documentation. This file is append-only, which means an existing code in the file will never be changed/removed.extract-errors.jsis an node script that traverses our codebase and updatescodes.json. You can test it by runningyarn extract-errors. It works by crawling the build artifacts directory, so you need to have either run the build script or downloaded pre-built artifacts (e.g. withyarn download build). It works with partial builds, too.transform-error-messagesis a Babel pass that rewrites error messages to IDs for a production (minified) build.