RUST-1635 Document WASM support (#413)

README.md

@@ -19,6 +19,7 @@ Encoding and decoding support for BSON in Rust
     - [Modeling BSON with strongly typed data structures](#modeling-bson-with-strongly-typed-data-structures)
     - [Working with datetimes](#working-with-datetimes)
     - [Working with UUIDs](#working-with-uuids)
+    - [WASM support](#wasm-support)
 - [Contributing](#contributing)
 - [Running the Tests](#running-the-tests)
 - [Continuous Integration](#continuous-integration)
@@ -250,6 +251,10 @@ let query = doc! {
 
 See the module-level documentation for the [`bson::uuid` module](https://docs.rs/bson/latest/bson/uuid).
 
+### WASM support
+
+This crate compiles to the `wasm32-unknown-unknown` target; when doing so, the `js-sys` crate is used for the current timestamp component of `ObjectId` generation.
+
 ## Minimum supported Rust version (MSRV)
 
 The MSRV for this crate is currently 1.48.0. This will be rarely be increased, and if it ever is,

src/lib.rs

@@ -260,6 +260,11 @@
 //!
 //! See the module level documentation for the [`uuid`] module.
 //!
+//! ## WASM support
+//!
+//! This crate compiles to the `wasm32-unknown-unknown` target; when doing so, the `js-sys` crate is
+//! used for the current timestamp component of `ObjectId` generation.
+//!
 //! ## Minimum supported Rust version (MSRV)
 //!
 //! The MSRV for this crate is currently 1.56.0. This will be rarely be increased, and if it ever is,
@@ -271,9 +276,9 @@
 
 #[doc(inline)]
 pub use self::{
+    binary::Binary,
     bson::{Array, Bson, DbPointer, Document, JavaScriptCodeWithScope, Regex, Timestamp},
     datetime::DateTime,
-    binary::Binary,
     de::{
         from_bson, from_bson_with_options, from_document, from_document_with_options, from_reader,
         from_reader_utf8_lossy, from_slice, from_slice_utf8_lossy, Deserializer,
@@ -293,8 +298,8 @@ pub use self::{
 
 #[macro_use]
 mod macros;
-mod bson;
 pub mod binary;
+mod bson;
 pub mod datetime;
 pub mod de;
 pub mod decimal128;