Fix error descriptions Embedded Swift compatibility (#759)

MaxDesiatov · web-flow · commit 453b841f4fd7 · 2026-06-09T20:13:15.000Z
The BridgeJS generator emits `JSError(message: String(describing: error))` for throwing `@JS` exports, but `String.init(describing:)` is unavailable in Embedded Swift, so embedded Wasm builds of any package with a throwing export fail. The caught error is statically a `JSException` with a stored `description`, so the generated glue now uses `error.description` for identical output. Snapshots regenerated.
diff --git a/Examples/PlayBridgeJS/Sources/PlayBridgeJS/Generated/BridgeJS.swift b/Examples/PlayBridgeJS/Sources/PlayBridgeJS/Generated/BridgeJS.swift
@@ -188,7 +188,7 @@ public func _bjs_PlayBridgeJS_updateDetailed(_ _self: UnsafeMutableRawPointer, _
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
diff --git a/Plugins/BridgeJS/Sources/BridgeJSCore/ExportSwift.swift b/Plugins/BridgeJS/Sources/BridgeJSCore/ExportSwift.swift
@@ -453,7 +453,7 @@ public class ExportSwift {
                                 _swift_js_throw(Int32(bitPattern: $0.id))
                             }
                         } else {
-                            let jsError = JSError(message: String(describing: error))
+                            let jsError = JSError(message: error.description)
                             withExtendedLifetime(jsError.jsObject) {
                                 _swift_js_throw(Int32(bitPattern: $0.id))
                             }
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/EnumNamespace.Global.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/EnumNamespace.Global.swift
@@ -117,7 +117,7 @@ public func _bjs_Services_Graph_GraphOperations_static_validate(_ graphId: Int32
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/EnumNamespace.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/EnumNamespace.swift
@@ -117,7 +117,7 @@ public func _bjs_Services_Graph_GraphOperations_static_validate(_ graphId: Int32
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/ImportedTypeInExportedInterface.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/ImportedTypeInExportedInterface.swift
@@ -59,7 +59,7 @@ public func _bjs_makeFoo() -> Int32 {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/Throws.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/Throws.swift
@@ -10,7 +10,7 @@ public func _bjs_throwsSomething() -> Void {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
diff --git a/Tests/BridgeJSRuntimeTests/Generated/BridgeJS.swift b/Tests/BridgeJSRuntimeTests/Generated/BridgeJS.swift
@@ -6967,7 +6967,7 @@ public func _bjs_makeImportedFoo(_ valueBytes: Int32, _ valueLength: Int32) -> I
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7002,7 +7002,7 @@ public func _bjs_throwsSwiftError(_ shouldThrow: Int32) -> Void {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7027,7 +7027,7 @@ public func _bjs_throwsWithIntResult() -> Int32 {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7052,7 +7052,7 @@ public func _bjs_throwsWithStringResult() -> Void {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7077,7 +7077,7 @@ public func _bjs_throwsWithBoolResult() -> Int32 {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7102,7 +7102,7 @@ public func _bjs_throwsWithFloatResult() -> Float32 {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7127,7 +7127,7 @@ public func _bjs_throwsWithDoubleResult() -> Float64 {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7152,7 +7152,7 @@ public func _bjs_throwsWithSwiftHeapObjectResult() -> UnsafeMutableRawPointer {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
@@ -7177,7 +7177,7 @@ public func _bjs_throwsWithJSObjectResult() -> Int32 {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }
         } else {
-            let jsError = JSError(message: String(describing: error))
+            let jsError = JSError(message: error.description)
             withExtendedLifetime(jsError.jsObject) {
                 _swift_js_throw(Int32(bitPattern: $0.id))
             }

Original file line number	Diff line number	Diff line change
`@@ -188,7 +188,7 @@ public func _bjs_PlayBridgeJS_updateDetailed(_ _self: UnsafeMutableRawPointer, _`
`188`	`188`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`189`	`189`	`}`
`190`	`190`	`} else {`
`191`		`- let jsError = JSError(message: String(describing: error))`
	`191`	`+ let jsError = JSError(message: error.description)`
`192`	`192`	`withExtendedLifetime(jsError.jsObject) {`
`193`	`193`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`194`	`194`	`}`
Original file line number	Diff line number	Diff line change
`@@ -453,7 +453,7 @@ public class ExportSwift {`
`453`	`453`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`454`	`454`	`}`
`455`	`455`	`} else {`
`456`		`- let jsError = JSError(message: String(describing: error))`
	`456`	`+ let jsError = JSError(message: error.description)`
`457`	`457`	`withExtendedLifetime(jsError.jsObject) {`
`458`	`458`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`459`	`459`	`}`
Original file line number	Diff line number	Diff line change
`@@ -117,7 +117,7 @@ public func _bjs_Services_Graph_GraphOperations_static_validate(_ graphId: Int32`
`117`	`117`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`118`	`118`	`}`
`119`	`119`	`} else {`
`120`		`- let jsError = JSError(message: String(describing: error))`
	`120`	`+ let jsError = JSError(message: error.description)`
`121`	`121`	`withExtendedLifetime(jsError.jsObject) {`
`122`	`122`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`123`	`123`	`}`
Original file line number	Diff line number	Diff line change
`@@ -59,7 +59,7 @@ public func _bjs_makeFoo() -> Int32 {`
`59`	`59`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`60`	`60`	`}`
`61`	`61`	`} else {`
`62`		`- let jsError = JSError(message: String(describing: error))`
	`62`	`+ let jsError = JSError(message: error.description)`
`63`	`63`	`withExtendedLifetime(jsError.jsObject) {`
`64`	`64`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`65`	`65`	`}`
Original file line number	Diff line number	Diff line change
`@@ -10,7 +10,7 @@ public func _bjs_throwsSomething() -> Void {`
`10`	`10`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`11`	`11`	`}`
`12`	`12`	`} else {`
`13`		`- let jsError = JSError(message: String(describing: error))`
	`13`	`+ let jsError = JSError(message: error.description)`
`14`	`14`	`withExtendedLifetime(jsError.jsObject) {`
`15`	`15`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`16`	`16`	`}`
Original file line number	Diff line number	Diff line change
`@@ -6967,7 +6967,7 @@ public func _bjs_makeImportedFoo(_ valueBytes: Int32, _ valueLength: Int32) -> I`
`6967`	`6967`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`6968`	`6968`	`}`
`6969`	`6969`	`} else {`
`6970`		`- let jsError = JSError(message: String(describing: error))`
	`6970`	`+ let jsError = JSError(message: error.description)`
`6971`	`6971`	`withExtendedLifetime(jsError.jsObject) {`
`6972`	`6972`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`6973`	`6973`	`}`
`@@ -7002,7 +7002,7 @@ public func _bjs_throwsSwiftError(_ shouldThrow: Int32) -> Void {`
`7002`	`7002`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7003`	`7003`	`}`
`7004`	`7004`	`} else {`
`7005`		`- let jsError = JSError(message: String(describing: error))`
	`7005`	`+ let jsError = JSError(message: error.description)`
`7006`	`7006`	`withExtendedLifetime(jsError.jsObject) {`
`7007`	`7007`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7008`	`7008`	`}`
`@@ -7027,7 +7027,7 @@ public func _bjs_throwsWithIntResult() -> Int32 {`
`7027`	`7027`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7028`	`7028`	`}`
`7029`	`7029`	`} else {`
`7030`		`- let jsError = JSError(message: String(describing: error))`
	`7030`	`+ let jsError = JSError(message: error.description)`
`7031`	`7031`	`withExtendedLifetime(jsError.jsObject) {`
`7032`	`7032`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7033`	`7033`	`}`
`@@ -7052,7 +7052,7 @@ public func _bjs_throwsWithStringResult() -> Void {`
`7052`	`7052`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7053`	`7053`	`}`
`7054`	`7054`	`} else {`
`7055`		`- let jsError = JSError(message: String(describing: error))`
	`7055`	`+ let jsError = JSError(message: error.description)`
`7056`	`7056`	`withExtendedLifetime(jsError.jsObject) {`
`7057`	`7057`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7058`	`7058`	`}`
`@@ -7077,7 +7077,7 @@ public func _bjs_throwsWithBoolResult() -> Int32 {`
`7077`	`7077`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7078`	`7078`	`}`
`7079`	`7079`	`} else {`
`7080`		`- let jsError = JSError(message: String(describing: error))`
	`7080`	`+ let jsError = JSError(message: error.description)`
`7081`	`7081`	`withExtendedLifetime(jsError.jsObject) {`
`7082`	`7082`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7083`	`7083`	`}`
`@@ -7102,7 +7102,7 @@ public func _bjs_throwsWithFloatResult() -> Float32 {`
`7102`	`7102`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7103`	`7103`	`}`
`7104`	`7104`	`} else {`
`7105`		`- let jsError = JSError(message: String(describing: error))`
	`7105`	`+ let jsError = JSError(message: error.description)`
`7106`	`7106`	`withExtendedLifetime(jsError.jsObject) {`
`7107`	`7107`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7108`	`7108`	`}`
`@@ -7127,7 +7127,7 @@ public func _bjs_throwsWithDoubleResult() -> Float64 {`
`7127`	`7127`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7128`	`7128`	`}`
`7129`	`7129`	`} else {`
`7130`		`- let jsError = JSError(message: String(describing: error))`
	`7130`	`+ let jsError = JSError(message: error.description)`
`7131`	`7131`	`withExtendedLifetime(jsError.jsObject) {`
`7132`	`7132`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7133`	`7133`	`}`
`@@ -7152,7 +7152,7 @@ public func _bjs_throwsWithSwiftHeapObjectResult() -> UnsafeMutableRawPointer {`
`7152`	`7152`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7153`	`7153`	`}`
`7154`	`7154`	`} else {`
`7155`		`- let jsError = JSError(message: String(describing: error))`
	`7155`	`+ let jsError = JSError(message: error.description)`
`7156`	`7156`	`withExtendedLifetime(jsError.jsObject) {`
`7157`	`7157`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7158`	`7158`	`}`
`@@ -7177,7 +7177,7 @@ public func _bjs_throwsWithJSObjectResult() -> Int32 {`
`7177`	`7177`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7178`	`7178`	`}`
`7179`	`7179`	`} else {`
`7180`		`- let jsError = JSError(message: String(describing: error))`
	`7180`	`+ let jsError = JSError(message: error.description)`
`7181`	`7181`	`withExtendedLifetime(jsError.jsObject) {`
`7182`	`7182`	`_swift_js_throw(Int32(bitPattern: $0.id))`
`7183`	`7183`	`}`