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GeezerVison is showing github.com — JavaScriptKit/Sources/JavaScriptKit/JSException.swift at main · swiftwasm/JavaScriptKit Expand file tree/ Copy pathJSException.swiftMore file actions 92 lines (82 loc) · 3.18 KB / Copy pathJSException.swiftFile metadata and controls92 lines (82 loc) · 3.18 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 /// `JSException` is a wrapper that handles exceptions thrown during JavaScript execution as Swift /// `Error` objects. /// When a JavaScript function throws an exception, it's wrapped as a `JSException` and propagated /// through Swift's error handling mechanism. /// /// Example: /// ```swift /// do { /// try jsFunction.throws() /// } catch let error as JSException { /// // Access the value thrown from JavaScript /// let jsErrorValue = error.thrownValue /// } /// ``` public struct JSException: Error, Equatable, CustomStringConvertible { /// Boxes the exception payload in a class so `JSException` stays within the direct /// typed-error convention on wasm32. private final class Storage { /// The actual JavaScript value that was thrown. let thrownValue: JSValue /// A description of the exception. let description: String /// The stack trace of the exception. let stack: String? init(thrownValue: JSValue, description: String, stack: String?) { self.thrownValue = thrownValue self.description = description self.stack = stack } } /// The boxed payload of the exception. /// /// Marked as `nonisolated(unsafe)` to satisfy `Sendable` requirement /// from `Error` protocol. private nonisolated(unsafe) let storage: Storage /// The value thrown from JavaScript. /// This can be any JavaScript value (error object, string, number, etc.). public var thrownValue: JSValue { return storage.thrownValue } /// A description of the exception. public var description: String { return storage.description } /// The stack trace of the exception. public var stack: String? { return storage.stack } /// Initializes a new JSException instance with a value thrown from JavaScript. /// /// Only available within the package. This must be called on the thread where the exception object created. /// The stringified representation is captured on the object owner thread to bring useful info /// to the catching thread even if they are different threads. @usableFromInline package init(_ thrownValue: JSValue) { if let errorObject = thrownValue.object, let stack = errorObject.stack.string { self.storage = Storage( thrownValue: thrownValue, description: "JSException(\(stack))", stack: stack ) } else { self.storage = Storage( thrownValue: thrownValue, description: "JSException(\(thrownValue))", stack: nil ) } } /// Initializes a new JavaScript `Error` instance with a message and prepare it to be thrown. /// /// - Parameters: /// - message: The message to throw. public init(message: String) { self.init(JSError(message: message).jsValue) } public static func == (lhs: JSException, rhs: JSException) -> Bool { return lhs.storage.thrownValue == rhs.storage.thrownValue && lhs.storage.description == rhs.storage.description && lhs.storage.stack == rhs.storage.stack } } |
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