AbstractModuleSource

Description

The AbstractModuleSource constructor (often referred to as %AbstractModuleSource% to indicate its "intrinsicness", since it does not correspond to any global exposed to a JavaScript program) serves as the superclass of all module source subclasses, providing a common interface of utility methods. This constructor is not directly exposed: there is no global AbstractModuleSource property. It is only accessible through Object.getPrototypeOf(moduleSourceObject.constructor) and similar.

AbstractModuleSource objects

WebAssembly.Module

JavaScript module source objects will be added by the ECMAScript Module Phase Imports proposal.

Constructor

This object cannot be instantiated directly — attempting to construct it with new throws a TypeError.

js

import source modSource from "./module.wasm";

new (Object.getPrototypeOf(modSource.constructor))();
// TypeError: Abstract class AbstractModuleSource not directly constructable

Instead, obtain a module source object using import source, import.source(), or a concrete module type's API, such as WebAssembly.Module(). These mechanisms do not call the abstract constructor.

Instance properties

These properties are defined on AbstractModuleSource.prototype and shared by all AbstractModuleSource subclass instances.

AbstractModuleSource.prototype.constructor: The constructor function that created the instance object. AbstractModuleSource.prototype.constructor is the hidden AbstractModuleSource constructor function, but each module source subclass also defines its own constructor property.
AbstractModuleSource.prototype[Symbol.toStringTag]: The initial value of the AbstractModuleSource.prototype[Symbol.toStringTag] property is a getter that returns a string based on the constructor's identity, such as "WebAssembly.Module" or "ModuleSource". It returns undefined if the this value is not an instance of one of the module source subclasses. This property is used in Object.prototype.toString().