Get the visual width of a string - the number of columns required to display it

Determine the East Asian Width of a Unicode character

Get the visual width of the widest line in a string - the number of columns required to display it

hast utility to check if a node is inter-element whitespace

A fast function for calculating the visual width of a string once printed to the terminal.

hast utility to check if a node is a (certain) element

A fast function for calculating where a string should be truncated, given an optional width limit and an ellipsis string.

Check whether a given string matches the `PotentialCustomElementName` production as defined in the HTML Standard.

get dimensions of any image file

List of HTML void tag names

hast utility to check if a node has a property

Create an array by repeating the given value n times.

Easily add ANSI colors to your text and symbols in the terminal. A faster drop-in replacement for chalk, kleur and turbocolor (without the dependencies and rendering bugs).

Polyfills the ResizeObserver API and supports box size options from the latest spec

List of known MathML tag names

A little helper for handling strings containing zero width control characters, ANSI styling, whitespaces, newlines, 💩, etc.

A custom element for extending the native media elements (<audio> or <video>)

Look up HTML tag names via HTML Element constructors, and vice versa.

A function that given input element, updates its width to fit its content.

Simplified JS/TS implementation of wcswidth() written by Markus Kuhn in C