diff --git a/crates/backend/src/ast.rs b/crates/backend/src/ast.rs
index 4c317cea..75c73860 100644
--- a/crates/backend/src/ast.rs
+++ b/crates/backend/src/ast.rs
@@ -79,6 +79,7 @@ pub struct Import {
 pub enum ImportModule {
     None,
     Named(String, Span),
+    RawNamed(String, Span),
     Inline(usize, Span),
 }
 
@@ -96,6 +97,10 @@ impl Hash for ImportModule {
                 2u8.hash(h);
                 idx.hash(h);
             }
+            ImportModule::RawNamed(name, _) => {
+                3u8.hash(h);
+                name.hash(h);
+            }
         }
     }
 }
diff --git a/crates/backend/src/codegen.rs b/crates/backend/src/codegen.rs
index bd0fd226..522b7e6b 100644
--- a/crates/backend/src/codegen.rs
+++ b/crates/backend/src/codegen.rs
@@ -844,6 +844,18 @@ impl ToTokens for ast::ImportEnum {
                 }
             }
 
+            #[allow(clippy::all)]
+            impl wasm_bindgen::convert::OptionIntoWasmAbi for #name {
+                #[inline]
+                fn none() -> Self::Abi { Object::none() }
+            }
+
+            #[allow(clippy::all)]
+            impl wasm_bindgen::convert::OptionFromWasmAbi for #name {
+                #[inline]
+                fn is_none(abi: &Self::Abi) -> bool { Object::is_none(abi) }
+            }
+
             #[allow(clippy::all)]
             impl From<#name> for wasm_bindgen::JsValue {
                 fn from(obj: #name) -> wasm_bindgen::JsValue {
diff --git a/crates/backend/src/encode.rs b/crates/backend/src/encode.rs
index abc8c613..2e327d20 100644
--- a/crates/backend/src/encode.rs
+++ b/crates/backend/src/encode.rs
@@ -208,6 +208,7 @@ fn shared_import<'a>(i: &'a ast::Import, intern: &'a Interner) -> Result<Import<
             ast::ImportModule::Named(m, span) => {
                 ImportModule::Named(intern.resolve_import_module(m, *span)?)
             }
+            ast::ImportModule::RawNamed(m, _span) => ImportModule::RawNamed(intern.intern_str(m)),
             ast::ImportModule::Inline(idx, _) => ImportModule::Inline(*idx as u32),
             ast::ImportModule::None => ImportModule::None,
         },
diff --git a/crates/cli-support/src/js/mod.rs b/crates/cli-support/src/js/mod.rs
index 57e90368..cdd2ea57 100644
--- a/crates/cli-support/src/js/mod.rs
+++ b/crates/cli-support/src/js/mod.rs
@@ -2836,6 +2836,7 @@ impl<'a, 'b> SubContext<'a, 'b> {
         // not sure how to import them.
         let is_local_snippet = match import.module {
             decode::ImportModule::Named(s) => self.cx.local_modules.contains_key(s),
+            decode::ImportModule::RawNamed(_) => false,
             decode::ImportModule::Inline(_) => true,
             decode::ImportModule::None => false,
         };
@@ -2921,11 +2922,13 @@ impl<'a, 'b> SubContext<'a, 'b> {
                 name,
                 field,
             },
-            decode::ImportModule::Named(module) => Import::Module {
-                module,
-                name,
-                field,
-            },
+            decode::ImportModule::Named(module) | decode::ImportModule::RawNamed(module) => {
+                Import::Module {
+                    module,
+                    name,
+                    field,
+                }
+            }
             decode::ImportModule::Inline(idx) => {
                 let offset = *self
                     .cx
diff --git a/crates/macro-support/src/parser.rs b/crates/macro-support/src/parser.rs
index 574af3c2..d94a4680 100644
--- a/crates/macro-support/src/parser.rs
+++ b/crates/macro-support/src/parser.rs
@@ -33,6 +33,7 @@ macro_rules! attrgen {
             (static_method_of, StaticMethodOf(Span, Ident)),
             (js_namespace, JsNamespace(Span, Ident)),
             (module, Module(Span, String, Span)),
+            (raw_module, RawModule(Span, String, Span)),
             (inline_js, InlineJs(Span, String, Span)),
             (getter, Getter(Span, Option<Ident>)),
             (setter, Setter(Span, Option<Ident>)),
@@ -1085,24 +1086,28 @@ impl MacroParse<BindgenAttrs> for syn::ItemForeignMod {
                 ));
             }
         }
-        let module = match opts.module() {
-            Some((name, span)) => {
-                if opts.inline_js().is_some() {
-                    let msg = "cannot specify both `module` and `inline_js`";
-                    errors.push(Diagnostic::span_error(span, msg));
-                }
-                ast::ImportModule::Named(name.to_string(), span)
+        let module = if let Some((name, span)) = opts.module() {
+            if opts.inline_js().is_some() {
+                let msg = "cannot specify both `module` and `inline_js`";
+                errors.push(Diagnostic::span_error(span, msg));
             }
-            None => {
-                match opts.inline_js() {
-                    Some((js, span)) => {
-                        let i = program.inline_js.len();
-                        program.inline_js.push(js.to_string());
-                        ast::ImportModule::Inline(i, span)
-                    }
-                    None => ast::ImportModule::None
-                }
+            if opts.raw_module().is_some() {
+                let msg = "cannot specify both `module` and `raw_module`";
+                errors.push(Diagnostic::span_error(span, msg));
             }
+            ast::ImportModule::Named(name.to_string(), span)
+        } else if let Some((name, span)) = opts.raw_module() {
+            if opts.inline_js().is_some() {
+                let msg = "cannot specify both `raw_module` and `inline_js`";
+                errors.push(Diagnostic::span_error(span, msg));
+            }
+            ast::ImportModule::RawNamed(name.to_string(), span)
+        } else if let Some((js, span)) = opts.inline_js() {
+            let i = program.inline_js.len();
+            program.inline_js.push(js.to_string());
+            ast::ImportModule::Inline(i, span)
+        } else {
+            ast::ImportModule::None
         };
         for item in self.items.into_iter() {
             if let Err(e) = item.macro_parse(program, module.clone()) {
diff --git a/crates/shared/src/lib.rs b/crates/shared/src/lib.rs
index 9b9356f2..5bd0072c 100644
--- a/crates/shared/src/lib.rs
+++ b/crates/shared/src/lib.rs
@@ -28,6 +28,7 @@ macro_rules! shared_api {
         enum ImportModule<'a> {
             None,
             Named(&'a str),
+            RawNamed(&'a str),
             Inline(u32),
         }
 
diff --git a/crates/typescript-tests/index.ts b/crates/typescript-tests/index.ts
deleted file mode 100644
index f36c5192..00000000
--- a/crates/typescript-tests/index.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import * as wbg from './pkg/typescript_tests';
-import * as wasm from './pkg/typescript_tests_bg';
-
-const a1: (a: string) => void = wbg.greet;
-const a2: (a: number, b: number) => void = wasm.greet;
-const a3: WebAssembly.Memory = wasm.memory;
-
-const c = new wbg.A();
-wbg.A.other();
-c.foo();
-c.free();
diff --git a/crates/typescript-tests/src/custom_section.rs b/crates/typescript-tests/src/custom_section.rs
new file mode 100644
index 00000000..e1f5c1fc
--- /dev/null
+++ b/crates/typescript-tests/src/custom_section.rs
@@ -0,0 +1,11 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen(typescript_custom_section)]
+const TS_INTERFACE_EXPORT: &'static str = r"
+  interface Height { height: number; }
+";
+
+#[wasm_bindgen]
+pub struct Person {
+    pub height: u32,
+}
\ No newline at end of file
diff --git a/crates/typescript-tests/src/custom_section.ts b/crates/typescript-tests/src/custom_section.ts
new file mode 100644
index 00000000..6420ea6d
--- /dev/null
+++ b/crates/typescript-tests/src/custom_section.ts
@@ -0,0 +1,3 @@
+import * as wbg from '../pkg/typescript_tests';
+
+const height: wbg.Height = new wbg.Person();
\ No newline at end of file
diff --git a/crates/typescript-tests/src/lib.rs b/crates/typescript-tests/src/lib.rs
index ea10b7b2..5e927e5a 100644
--- a/crates/typescript-tests/src/lib.rs
+++ b/crates/typescript-tests/src/lib.rs
@@ -1,20 +1,4 @@
-use wasm_bindgen::prelude::*;
-
-#[wasm_bindgen]
-pub fn greet(_: &str) {}
-
-#[wasm_bindgen]
-struct A {
-}
-
-#[wasm_bindgen]
-impl A {
-    #[wasm_bindgen(constructor)]
-    pub fn new() -> A {
-        A {}
-    }
-
-    pub fn other() {}
-
-    pub fn foo(&self) {}
-}
+mod custom_section;
+mod opt_args_and_ret;
+mod simple_fn;
+mod simple_struct;
\ No newline at end of file
diff --git a/crates/typescript-tests/src/memory.ts b/crates/typescript-tests/src/memory.ts
new file mode 100644
index 00000000..b1095b00
--- /dev/null
+++ b/crates/typescript-tests/src/memory.ts
@@ -0,0 +1,3 @@
+import * as wasm from '../pkg/typescript_tests_bg';
+
+const memory: WebAssembly.Memory = wasm.memory;
diff --git a/crates/typescript-tests/src/opt_args_and_ret.rs b/crates/typescript-tests/src/opt_args_and_ret.rs
new file mode 100644
index 00000000..a84f2bfe
--- /dev/null
+++ b/crates/typescript-tests/src/opt_args_and_ret.rs
@@ -0,0 +1,6 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub fn opt_fn(_a: Option<i32>) -> Option<i32> {
+    None
+}
\ No newline at end of file
diff --git a/crates/typescript-tests/src/opt_args_and_ret.ts b/crates/typescript-tests/src/opt_args_and_ret.ts
new file mode 100644
index 00000000..d0bd20a4
--- /dev/null
+++ b/crates/typescript-tests/src/opt_args_and_ret.ts
@@ -0,0 +1,3 @@
+import * as wbg from '../pkg/typescript_tests';
+
+const opt_fn: (a: number | undefined) => number | undefined = wbg.opt_fn;
\ No newline at end of file
diff --git a/crates/typescript-tests/src/simple_fn.rs b/crates/typescript-tests/src/simple_fn.rs
new file mode 100644
index 00000000..29a7d4aa
--- /dev/null
+++ b/crates/typescript-tests/src/simple_fn.rs
@@ -0,0 +1,4 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub fn greet(_: &str) {}
\ No newline at end of file
diff --git a/crates/typescript-tests/src/simple_fn.ts b/crates/typescript-tests/src/simple_fn.ts
new file mode 100644
index 00000000..f8b91d08
--- /dev/null
+++ b/crates/typescript-tests/src/simple_fn.ts
@@ -0,0 +1,5 @@
+import * as wbg from '../pkg/typescript_tests';
+import * as wasm from '../pkg/typescript_tests_bg';
+
+const wbg_greet: (a: string) => void = wbg.greet;
+const wasm_greet: (a: number, b: number) => void = wasm.greet;
\ No newline at end of file
diff --git a/crates/typescript-tests/src/simple_struct.rs b/crates/typescript-tests/src/simple_struct.rs
new file mode 100644
index 00000000..d15e5031
--- /dev/null
+++ b/crates/typescript-tests/src/simple_struct.rs
@@ -0,0 +1,17 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub struct A {
+}
+
+#[wasm_bindgen]
+impl A {
+    #[wasm_bindgen(constructor)]    
+    pub fn new() -> A {
+        A {}
+    }
+
+    pub fn other() {}
+
+    pub fn foo(&self) {}
+}
\ No newline at end of file
diff --git a/crates/typescript-tests/src/simple_struct.ts b/crates/typescript-tests/src/simple_struct.ts
new file mode 100644
index 00000000..95830399
--- /dev/null
+++ b/crates/typescript-tests/src/simple_struct.ts
@@ -0,0 +1,6 @@
+import * as wbg from '../pkg/typescript_tests';
+
+const a = new wbg.A();
+wbg.A.other();
+a.foo();
+a.free();
diff --git a/crates/typescript-tests/tsconfig.json b/crates/typescript-tests/tsconfig.json
index bdd06907..90892979 100644
--- a/crates/typescript-tests/tsconfig.json
+++ b/crates/typescript-tests/tsconfig.json
@@ -9,6 +9,6 @@
         "baseUrl": "."
     },
     "include": [
-        "index.ts"
+        "src/*.ts"
     ]
 }
diff --git a/crates/web-sys/Cargo.toml b/crates/web-sys/Cargo.toml
index 5956f168..931bb2b5 100644
--- a/crates/web-sys/Cargo.toml
+++ b/crates/web-sys/Cargo.toml
@@ -814,6 +814,9 @@ RtcRtpSender = []
 RtcRtpSourceEntry = []
 RtcRtpSourceEntryType = []
 RtcRtpSynchronizationSource = []
+RtcRtpTransceiver = []
+RtcRtpTransceiverDirection = []
+RtcRtpTransceiverInit = []
 RtcRtxParameters = []
 RtcSdpType = []
 RtcSessionDescription = []
@@ -826,6 +829,7 @@ RtcStatsReport = []
 RtcStatsReportInternal = []
 RtcStatsType = []
 RtcTrackEvent = []
+RtcTrackEventInit = []
 RtcTransportStats = []
 RtcdtmfSender = []
 RtcdtmfToneChangeEvent = []
diff --git a/crates/web-sys/tests/wasm/main.rs b/crates/web-sys/tests/wasm/main.rs
index d4c01b8d..f27d6af7 100644
--- a/crates/web-sys/tests/wasm/main.rs
+++ b/crates/web-sys/tests/wasm/main.rs
@@ -48,6 +48,7 @@ pub mod pre_element;
 pub mod progress_element;
 pub mod quote_element;
 pub mod response;
+pub mod rtc_rtp_transceiver_direction;
 pub mod script_element;
 pub mod select_element;
 pub mod slot_element;
diff --git a/crates/web-sys/tests/wasm/rtc_rtp_transceiver_direction.rs b/crates/web-sys/tests/wasm/rtc_rtp_transceiver_direction.rs
new file mode 100644
index 00000000..15dbe7aa
--- /dev/null
+++ b/crates/web-sys/tests/wasm/rtc_rtp_transceiver_direction.rs
@@ -0,0 +1,92 @@
+use wasm_bindgen::{prelude::*, JsCast};
+use wasm_bindgen_futures::JsFuture;
+use wasm_bindgen_test::*;
+
+use futures::{
+    future::{ok, IntoFuture},
+    Future,
+};
+
+use web_sys::{
+    RtcPeerConnection, RtcRtpTransceiver, RtcRtpTransceiverDirection, RtcRtpTransceiverInit,
+    RtcSessionDescriptionInit,
+};
+
+#[wasm_bindgen(
+    inline_js = "export function is_unified_avail() { return Object.keys(RTCRtpTransceiver.prototype).indexOf('currentDirection')>-1; }"
+)]
+extern "C" {
+    /// Available in FF since forever, in Chrome since 72, in Safari since 12.1
+    fn is_unified_avail() -> bool;
+}
+
+#[wasm_bindgen_test(async)]
+fn rtc_rtp_transceiver_direction() -> Box<dyn Future<Item = (), Error = JsValue>> {
+    if !is_unified_avail() {
+        return Box::new(Ok(()).into_future());
+    }
+
+    let mut tr_init: RtcRtpTransceiverInit = RtcRtpTransceiverInit::new();
+
+    let pc1: RtcPeerConnection = RtcPeerConnection::new().unwrap();
+
+    let tr1: RtcRtpTransceiver = pc1.add_transceiver_with_str_and_init(
+        "audio",
+        tr_init.direction(RtcRtpTransceiverDirection::Sendonly),
+    );
+    assert_eq!(tr1.direction(), RtcRtpTransceiverDirection::Sendonly);
+    assert_eq!(tr1.current_direction(), None);
+
+    let pc2: RtcPeerConnection = RtcPeerConnection::new().unwrap();
+
+    let r = exchange_sdps(pc1, pc2).and_then(move |(_, p2)| {
+        assert_eq!(tr1.direction(), RtcRtpTransceiverDirection::Sendonly);
+        assert_eq!(
+            tr1.current_direction(),
+            Some(RtcRtpTransceiverDirection::Sendonly)
+        );
+
+        let tr2: RtcRtpTransceiver = js_sys::try_iter(&p2.get_transceivers())
+            .unwrap()
+            .unwrap()
+            .next()
+            .unwrap()
+            .unwrap()
+            .unchecked_into();
+
+        assert_eq!(tr2.direction(), RtcRtpTransceiverDirection::Recvonly);
+        assert_eq!(
+            tr2.current_direction(),
+            Some(RtcRtpTransceiverDirection::Recvonly)
+        );
+
+        Ok(())
+    });
+
+    Box::new(r)
+}
+
+fn exchange_sdps(
+    p1: RtcPeerConnection,
+    p2: RtcPeerConnection,
+) -> impl Future<Item = (RtcPeerConnection, RtcPeerConnection), Error = JsValue> {
+    JsFuture::from(p1.create_offer())
+        .and_then(move |offer| {
+            let offer = offer.unchecked_into::<RtcSessionDescriptionInit>();
+            JsFuture::from(p1.set_local_description(&offer)).join4(
+                JsFuture::from(p2.set_remote_description(&offer)),
+                Ok(p1),
+                Ok(p2),
+            )
+        })
+        .and_then(|(_, _, p1, p2)| JsFuture::from(p2.create_answer()).join3(Ok(p1), Ok(p2)))
+        .and_then(|(answer, p1, p2)| {
+            let answer = answer.unchecked_into::<RtcSessionDescriptionInit>();
+            JsFuture::from(p2.set_local_description(&answer)).join4(
+                JsFuture::from(p1.set_remote_description(&answer)),
+                Ok(p1),
+                Ok(p2),
+            )
+        })
+        .and_then(|(_, _, p1, p2)| Ok((p1, p2)))
+}
diff --git a/crates/web-sys/webidls/unavailable_option_primitive/RTCRtpTransceiver.webidl b/crates/web-sys/webidls/enabled/RTCRtpTransceiver.webidl
similarity index 100%
rename from crates/web-sys/webidls/unavailable_option_primitive/RTCRtpTransceiver.webidl
rename to crates/web-sys/webidls/enabled/RTCRtpTransceiver.webidl
diff --git a/crates/webidl-tests/enums.js b/crates/webidl-tests/enums.js
index fa23ec81..1750f69e 100644
--- a/crates/webidl-tests/enums.js
+++ b/crates/webidl-tests/enums.js
@@ -18,4 +18,12 @@ global.Shape = class Shape {
   getShape() {
     return this.kind;
   }
+
+  get shapeTypeNone() {
+    return null;
+  }
+
+  get shapeTypeSome() {
+    return this.kind;
+  }
 };
diff --git a/crates/webidl-tests/enums.rs b/crates/webidl-tests/enums.rs
index b5e0949e..23f258c2 100644
--- a/crates/webidl-tests/enums.rs
+++ b/crates/webidl-tests/enums.rs
@@ -35,3 +35,17 @@ fn invalid_enum_return() {
         _ => {} // Success
     };
 }
+
+#[wasm_bindgen_test]
+fn read_optional_enum_attribute_none() {
+    let shape = Shape::new(ShapeType::Circle).unwrap();
+    let shape_type: Option<ShapeType> = shape.shape_type_none();
+    assert_eq!(shape_type, None);
+}
+
+#[wasm_bindgen_test]
+fn read_optional_enum_attribute_some() {
+    let shape = Shape::new(ShapeType::Circle).unwrap();
+    let shape_type: Option<ShapeType> = shape.shape_type_some();
+    assert_eq!(shape_type, Some(ShapeType::Circle));
+}
diff --git a/crates/webidl-tests/enums.webidl b/crates/webidl-tests/enums.webidl
index acd043b3..b200888d 100644
--- a/crates/webidl-tests/enums.webidl
+++ b/crates/webidl-tests/enums.webidl
@@ -12,4 +12,8 @@ interface Shape {
 
   [Pure]
     ShapeType getShape();
+
+  readonly attribute ShapeType? shapeTypeNone;
+
+  readonly attribute ShapeType? shapeTypeSome;
 };
diff --git a/guide/src/SUMMARY.md b/guide/src/SUMMARY.md
index 077c50cb..530b1286 100644
--- a/guide/src/SUMMARY.md
+++ b/guide/src/SUMMARY.md
@@ -66,6 +66,7 @@
       - [`js_namespace`](./reference/attributes/on-js-imports/js_namespace.md)
       - [`method`](./reference/attributes/on-js-imports/method.md)
       - [`module = "blah"`](./reference/attributes/on-js-imports/module.md)
+      - [`raw_module = "blah"`](./reference/attributes/on-js-imports/raw_module.md)
       - [`static_method_of = Blah`](./reference/attributes/on-js-imports/static_method_of.md)
       - [`structural`](./reference/attributes/on-js-imports/structural.md)
       - [`variadic`](./reference/attributes/on-js-imports/variadic.md)
diff --git a/guide/src/reference/attributes/on-js-imports/module.md b/guide/src/reference/attributes/on-js-imports/module.md
index 4f6b4408..24643e42 100644
--- a/guide/src/reference/attributes/on-js-imports/module.md
+++ b/guide/src/reference/attributes/on-js-imports/module.md
@@ -31,3 +31,8 @@ generates JavaScript import glue like:
 ```js
 let illmatic = this.illmatic;
 ```
+
+Note that if the string specified with `module` starts with `./`, `../`, or `/`
+then it's interpreted as a path to a [local JS snippet](../../js-snippets.html).
+If this doesn't work for your use case you might be interested in the
+[`raw_module` attribute](raw_module.html)
diff --git a/guide/src/reference/attributes/on-js-imports/raw_module.md b/guide/src/reference/attributes/on-js-imports/raw_module.md
new file mode 100644
index 00000000..1f8da2f3
--- /dev/null
+++ b/guide/src/reference/attributes/on-js-imports/raw_module.md
@@ -0,0 +1,19 @@
+# `raw_module = "blah"`
+
+This attribute performs exactly the same purpose as the [`module`
+attribute](module.html) on JS imports, but it does not attempt to interpret
+paths starting with `./`, `../`, or `/` as JS snippets. For example:
+
+```rust
+#[wasm_bindgen(raw_module = "./some/js/file.js")]
+extern "C" {
+    fn the_function();
+}
+```
+
+Note that if you use this attribute with a relative or absolute path, it's
+likely up to the final bundler or project to assign meaning to that path. This
+typically means that the JS file or module will be resolved relative to the
+final location of the wasm file itself. That means that `raw_module` is likely
+unsuitable for libraries on crates.io, but may be usable within end-user
+applications.
diff --git a/package.json b/package.json
index 22697755..febc4025 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "serve": "webpack-dev-server -p"
   },
   "devDependencies": {
-    "@wasm-tool/wasm-pack-plugin": "0.2.5",
+    "@wasm-tool/wasm-pack-plugin": "0.2.7",
     "html-webpack-plugin": "^3.2.0",
     "text-encoding": "^0.7.0",
     "webpack": "^4.29.4",