tag

An WebAssembly.Tag defining the data types expected for each of the values in the payload.

payload

An array of one or more data fields comprising the payload of the exception. The elements must match the data types of the corresponding elements in the tag. If the number of data fields in the payload and their types don't match, a TypeError exception is thrown.

options Optional Non-standard

An object with the following optional fields:

traceStack Optional Non-standard

true if the Exception may have a stack trace attached to its stack property, otherwise false. This is false by default (if options or options.traceStack are not provided).

TypeError

The payload and tag sequences do not have the same number of elements and/or the elements are not of matching types.

This example shows the creation of an exception using a simple tag.

// Create tag and use it to create an exception
const tag = new WebAssembly.Tag({ parameters: ["i32", "f32"] });
const exception = new WebAssembly.Exception(tag, [42, 42.3]);

The stack example shows the creation of an exception that uses the options parameter.

• WebAssembly overview
• WebAssembly concepts
• Using the WebAssembly JavaScript API