Adding in with_cfg macro

src/dom.rs

@@ -1170,7 +1170,7 @@ pub mod __internal {
 #[cfg(test)]
 mod tests {
     use super::{DomBuilder, text_signal, RefFn};
-    use crate::{html, shadow_root, ShadowRootMode};
+    use crate::{html, shadow_root, ShadowRootMode, with_cfg};
     use futures_signals::signal::{always, SignalExt};
     use lazy_static::lazy_static;
     use web_sys::HtmlElement;
@@ -1316,4 +1316,17 @@ mod tests {
             })
         });
     }
+
+    #[test]
+    fn with_cfg() {
+        let _a = html!("div", {
+            .with_cfg!(target_arch = "wasm32", {
+                .attribute("foo", "bar")
+            })
+
+            .with_cfg!(all(not(foo), bar = "test", feature = "hi"), {
+                .attribute("foo", "bar")
+            })
+        });
+    }
 }

src/macros.rs

@@ -44,6 +44,20 @@ macro_rules! with_node {
 }
 
 
+#[macro_export]
+macro_rules! with_cfg {
+    ($this:ident, $cfg:meta, { $($methods:tt)* }) => {{
+        #[cfg($cfg)]
+        let this = $crate::apply_methods!($this, { $($methods)* });
+
+        #[cfg(not($cfg))]
+        let this = $this;
+
+        this
+    }};
+}
+
+
 #[macro_export]
 macro_rules! shadow_root {
     ($this:ident, $mode:expr => { $($methods:tt)* }) => {{