The JavaScript exception "class constructors must be invoked with 'new'" occurs when a class constructor is called without the new keyword. All class constructors must be called with new.

The k4 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

Static initialization blocks are declared within a class. It contains statements to be evaluated during class initialization. This permits more flexible initialization logic than static properties, such as using try...catch or setting multiple fields from a single value. Initialization is performed in the context of the current class declaration, with access to private state, which allows the class to share information of its private elements with other classes or functions declared in the same scope (analogous to "friend" classes in C++).

The JavaScript exception "await is only valid in async functions, async generators and modules" occurs when an await expression is used outside of async functions or modules or other async contexts.

The JavaScript exception "duplicate capture group name in regular expression" occurs when a regular expression pattern contains two or more named capturing groups with the same name, and these capture groups could be matched at the same time.

An owning iterator over the keys of a `HashMap`.

The unary negation operator `-`.

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Iterator over the entries in a directory.

Learn about the new features, bug fixes, and breaking changes for the newest Buildx release