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The WebAssembly.RuntimeError() constructor creates a new WebAssembly RuntimeError object — the type that is thrown whenever WebAssembly specifies a trap.

Syntax

new WebAssembly.RuntimeError(message, fileName, lineNumber)

Parameters

message Optional
Human-readable description of the error.
fileName Optional
The name of the file containing the code that caused the exception.
lineNumber Optional
The line number of the code that caused the exception.

Properties

The RuntimeError constructor contains no unique properties of its own, however, it does inherit some properties through the prototype chain.

WebAssembly.RuntimeError.prototype.constructor
Specifies the function that created an instance's prototype.
WebAssembly.RuntimeError.prototype.message
Error message. Although ECMA-262 specifies that URIError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message.
WebAssembly.RuntimeError.prototype.name
Error name. Inherited from Error.
WebAssembly.RuntimeError.prototype.fileName
Path to file that raised this error. Inherited from Error.
WebAssembly.RuntimeError.prototype.lineNumber
Line number in file that raised this error. Inherited from Error.
WebAssembly.RuntimeError.prototype.columnNumber
Column number in line that raised this error. Inherited from Error.
WebAssembly.RuntimeError.prototype.stack
Stack trace. Inherited from Error.

Methods

The RuntimeError constructor contains no methods of its own, however, it does inherit some methods through the prototype chain.

WebAssembly.RuntimeError.prototype.toSource()
Returns code that could eval to the same error. Inherited from Error.
WebAssembly.RuntimeError.prototype.toString()
Returns a string representing the specified Error object.. Inherited from Error.

Examples

The following snippet creates a new RuntimeError instance, and logs its details to the console:

try {
  throw new WebAssembly.RuntimeError('Hello', 'someFile', 10);
} catch (e) {
  console.log(e instanceof RuntimeError); // true
  console.log(e.message);                 // "Hello"
  console.log(e.name);                    // "RuntimeError"
  console.log(e.fileName);                // "someFile"
  console.log(e.lineNumber);              // 10
  console.log(e.columnNumber);            // 0
  console.log(e.stack);                   // returns the location where the code was run
}

Specifications

Specification Status Comment
WebAssembly JavaScript Interface
The definition of 'WebAssembly constructors' in that specification.
Working Draft Initial WebAssembly draft definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'NativeError' in that specification.
Draft Definition of standard NativeError types.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 57Edge Full support 16Firefox Full support 52
Notes
Full support 52
Notes
Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes
Disabled
Full support Yes
Disabled
Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52
Notes
Full support 52
Notes
Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

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