WebAssembly.RuntimeError() constructor

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


new WebAssembly.RuntimeError()
new WebAssembly.RuntimeError(message)
new WebAssembly.RuntimeError(message, options)
new WebAssembly.RuntimeError(message, fileName)
new WebAssembly.RuntimeError(message, fileName, lineNumber)


message Optional

Human-readable description of the error.

options Optional

An object that has the following properties:

cause Optional

A property indicating the specific cause of the error. When catching and re-throwing an error with a more-specific or useful error message, this property can be used to pass the original error.

fileName Optional Non-standard

The name of the file containing the code that caused the exception.

lineNumber Optional Non-standard

The line number of the code that caused the exception.


Creating a new RuntimeError instance

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 WebAssembly.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


WebAssembly JavaScript Interface: Exception Handling
# exceptiondef-runtimeerror
ECMAScript Language Specification
# sec-nativeerror-constructors

Browser compatibility

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See also