The JavaScript exception "derived class constructor returned invalid value x" occurs when a derived class constructor returns a value that is not an object or undefined.

An input boundary assertion checks if the current position in the string is an input boundary. An input boundary is the start or end of the string; or, if the m flag is set, the start or end of a line.

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The JavaScript exception "is not iterable" occurs when the value which is spread into an array or function call, given as the right-hand side of for...of, as argument of a function such as Promise.all or Set(), or as the right-hand side of an array destructuring, is not an iterable object. This error is also encountered when Array.fromAsync() or for await...of is used with a non-async iterable.

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The JavaScript exception "radix must be an integer at least 2 and no greater than 36" occurs when the optional radix parameter of the Number.prototype.toString() or the BigInt.prototype.toString() method was specified and is not between 2 and 36.

The [Symbol.matchAll]() method of RegExp instances specifies how String.prototype.matchAll should behave.

The global accessor property of RegExp instances returns whether or not the g flag is used with this regular expression.

The script accessor property of Intl.Locale instances returns the script used for writing the particular language used in this locale.