tokio-fs-ext 0.7.1

Extend tokio fs to be compatible with native and wasm
Documentation 
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use std::io;

use js_sys::Object;
use wasm_bindgen::{JsCast, JsValue};
use web_sys::DomException;

/// Helper to convert JsValue to io::Error via OpfsError
#[inline]
pub(crate) fn opfs_err(err: JsValue) -> io::Error {
    OpfsError::from(err).into()
}

pub(crate) struct OpfsError {
    js_err: JsValue,
}

impl From<JsValue> for OpfsError {
    fn from(js_err: JsValue) -> Self {
        Self { js_err }
    }
}

impl From<OpfsError> for io::Error {
    fn from(opfs_err: OpfsError) -> Self {
        match opfs_err.js_err.dyn_ref::<DomException>() {
            Some(e) => match e.name().as_str() {
                "NotFoundError" => io::Error::from(io::ErrorKind::NotFound),
                "NotAllowedError" => io::Error::from(io::ErrorKind::PermissionDenied),
                // NoModificationAllowedError: file is locked by another SyncAccessHandle
                // Use WouldBlock to indicate the resource is temporarily unavailable
                "NoModificationAllowedError" => io::Error::new(
                    io::ErrorKind::WouldBlock,
                    "file is locked by another handle",
                ),
                "TypeMismatchError" => io::Error::other("type mismatch"),
                // QuotaExceededError: storage quota exceeded
                "QuotaExceededError" => io::Error::new(
                    io::ErrorKind::StorageFull,
                    "storage quota exceeded",
                ),
                msg => io::Error::other(msg),
            },
            None => io::Error::other(format!("{}", Object::from(opfs_err.js_err).to_string())),
        }
    }
}