nicematrix package provides the following environments:
NiceMatrix
pNiceMatrix
bNiceMatrix
BNiceMatrix
vNiceMatrix
VNiceMatrix
NiceArray
pNiceArray
bNiceArray
BNiceArray
vNiceArray
VNiceArray
NiceTabular
NiceTabular*
NiceTabularX
NiceArray environment is similar to array environment, and NiceMatrix environment is similar to matrix environment provided by amsmath.
Demonstrations
Sample TeX file
```latex
\documentclass{article}
\usepackage{nicematrix}
\begin{document}
\begin{equation}
\begin{NiceMatrix}
a & b & c \\
d & e & f \\
g & h & i
\end{NiceMatrix}
\begin{NiceArray}{ccc}
a & b & c \\
d & e & f \\
g & h & i
\end{NiceArray}
\end{equation}
\end{document}
```
Grammar supports NiceTabular[*X]? environment (https://github.com/jlelong/vscode-latex-basics/pull/12), but not NiceMatrix or NiceArray environments.
&is not highlighted correctly.Probably, need to fix it here.
https://github.com/jlelong/vscode-latex-basics/blob/4479589c0f5c21c7f5ef17551e1013ab72e7f718/syntaxes/LaTeX.tmLanguage.json#L811
nicematrix package
nicematrix package provides the following environments:
NiceArray environment is similar to array environment, and NiceMatrix environment is similar to matrix environment provided by amsmath.
Demonstrations
Sample TeX file
Version
LaTeX Workshop: 8.27.2
VS Code
Windows11