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[web] Remove outdated information in web_ui/README #38006

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Dec 2, 2022
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[web] Remove outdated information in web_ui/README #38006

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33 changes: 0 additions & 33 deletions lib/web_ui/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -248,39 +248,6 @@ Instead, we update this file manually once in a while.
`canvaskit_lock.yaml` locks the version of CanvasKit for tests and production
use.

## Troubleshooting

### Can't load Kernel binary: Invalid kernel binary format version.

Sometimes `.dart_tool` cache invalidation fails, and you'll end up with a
cached version of `felt` that is not compatible with the Dart SDK that you're
using.

In that case, any invocation to `felt` will fail with:

```
Can't load Kernel binary: Invalid kernel binary format version.
```

The solution is to delete the cached `felt.snapshot` files under `lib/web_ui`:

```
rm .dart_tool/felt.snapshot*
```

## Hacking on the `felt` tool itself

If you are making changes in the `felt` tool itself, you need to be aware of
Dart snapshots. We create a Dart snapshot of the `felt` tool to make the startup
faster.

To run `felt` from sources, disable the snapshot using the `FELT_USE_SNAPSHOT`
environment variable:

```
FELT_USE_SNAPSHOT=false felt <command>
```

## Building CanvasKit

To build CanvasKit locally, you must first set up your gclient config to
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