add try statement catching

rewriter/Cargo.toml

@@ -6,6 +6,10 @@ edition = "2021"
 [lib]
 crate-type = ["cdylib"]
 
+[features]
+default = ["debug"]
+debug = []
+
 [profile.speed]
 inherits = "release"
 opt-level = 3

rewriter/src/rewrite.rs

@@ -1,6 +1,9 @@
 use oxc_allocator::Allocator;
 use oxc_ast::{
-    ast::{AssignmentTarget, Expression, IdentifierReference, ObjectPropertyKind},
+    ast::{
+        AssignmentTarget, BindingPattern, BindingPatternKind, Expression, IdentifierReference,
+        ObjectPropertyKind,
+    },
     visit::walk,
     Visit,
 };
@@ -144,6 +147,22 @@ impl<'a> Visit<'a> for Rewriter {
         // do not walk further, we don't want to rewrite the identifiers
     }
 
+    #[cfg(feature = "debug")]
+    fn visit_try_statement(&mut self, it: &oxc_ast::ast::TryStatement<'a>) {
+        // for debugging we need to know what the error was
+
+        if let Some(h) = &it.handler {
+            if let Some(name) = &h.param {
+                if let Some(name) = name.pattern.get_identifier() {
+                    self.jschanges.push(JsChange::GenericChange {
+                        span: Span::new(h.body.span.start + 1, h.body.span.start + 1),
+                        text: format!("$scramerr({});", name),
+                    });
+                }
+            }
+        }
+    }
+
     fn visit_object_expression(&mut self, it: &oxc_ast::ast::ObjectExpression<'a>) {
         for prop in &it.properties {
             #[allow(clippy::single_match)]

src/client/shared/function.ts

@@ -2,21 +2,21 @@ import { ScramjetClient, ProxyCtx } from "../client";
 import { rewriteJs } from "../shared";
 
 function rewriteFunction(ctx: ProxyCtx) {
-    const stringifiedFunction = ctx.fn(...ctx.args).toString();
+	const stringifiedFunction = ctx.fn(...ctx.args).toString();
 
-    ctx.return(ctx.fn(`return ${rewriteJs(stringifiedFunction)}`)());
+	ctx.return(ctx.fn(`return ${rewriteJs(stringifiedFunction)}`)());
 }
 
 export default function (client: ScramjetClient, self: Self) {
-    client.Proxy("Function", {
+	client.Proxy("Function", {
-        apply(ctx) {
+		apply(ctx) {
-            rewriteFunction(ctx);
+			rewriteFunction(ctx);
-        },
+		},
 
-        construct(ctx) {
+		construct(ctx) {
-            rewriteFunction(ctx);
+			rewriteFunction(ctx);
-        },
+		},
-    });
+	});
 
-    Function.prototype.constructor = Function;
+	Function.prototype.constructor = Function;
-}
+}

src/client/shared/wrap.ts

@@ -82,4 +82,8 @@ export default function (client: ScramjetClient, self: typeof globalThis) {
 				break;
 		}
 	}
+
+	window.$scramerr = function scramerr(e) {
+		console.error("CAUGHT ERROR", e);
+	};
 }