roee88 commented on a change in pull request #674:
URL: https://github.com/apache/arrow-rs/pull/674#discussion_r684726091
##########
File path: arrow/README.md
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@@ -59,11 +59,13 @@ println!("{:?}", array.value(1));
## Building for WASM
-In order to compile Arrow for Web Assembly (the `wasm32-unknown-unknown` WASM
target), you will likely need to turn off this crate's default features and use
the `js` feature.
+Arrow can compile to WebAssembly using the `wasm32-unknown-unknown` and
`wasm32-wasi` targets.
+
+In order to compile Arrow for `wasm32-unknown-unknown` you will need to
exclude test dependencies (the `test_utils` feature). For example, use this
snippet in your `Cargo.toml`:
```toml
[dependencies]
-arrow = { version = "5.0", default-features = false, features = ["js"] }
+arrow = { version = "5.0", default-features = false, features = ["csv", "ipc",
"simd"] }
```
Review comment:
### side note
When compiling to `wasm32-wasi` you can also enable the `prettyprint`
feature if you patch `prettytable-rs` in your `Cargo.toml`:
```toml
[patch.crates-io]
prettytable-rs = { git = "https://github.com/phsym/prettytable-rs";, branch =
"master"}
```
This is mentioned in polars but I'm not sure if this fits the arrow README
so I didn't include it. The arrow2 project recently changed to comfy-table
because prettytable-rs is not maintained (see
https://github.com/jorgecarleitao/arrow2/pull/251). I don't think that
comfy-table compiles to wasm32-wasi but that's minor for now.
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