(wasm) Cleanup and refactoring, add TableDB transactions, copy over docs for JSDoc.

veilid-wasm/src/wasm_helpers.rs

@@ -1,3 +1,5 @@
+use super::*;
+
 cfg_if::cfg_if! {
   if #[cfg(target_arch = "wasm32")] {
       pub use tsify::*;
@@ -19,3 +21,18 @@ cfg_if::cfg_if! {
   }
 }
 pub(crate) use from_impl_to_jsvalue;
+
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(typescript_type = "string[]")]
+    pub type StringArray;
+}
+
+/// Convert a `Vec<String>` into a `js_sys::Array` with the type of `string[]`
+pub(crate) fn into_unchecked_string_array(items: Vec<String>) -> StringArray {
+    items
+        .iter()
+        .map(JsValue::from)
+        .collect::<js_sys::Array>()
+        .unchecked_into::<StringArray>() // TODO: can I do this a better way?
+}