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


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.


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