This package is compatible with and was tested against the tree-sitter grammar for Wat/Wast found at https://github.com/wasm-lsp/tree-sitter-wasm.

It provides indentation, font-locking, imenu, and navigation support for Wat and Wast buffers.

Emacs 29.1 or above with tree-sitter support is required.

Tree-sitter starter guide: https://git.savannah.gnu.org/cgit/emacs.git/tree/admin/notes/tree-sitter/starter-guide?h=emacs-29

To install the wat/wasm grammar libraries, add the sources to treesit-language-source-alist.

;; wat
(add-to-list
 'treesit-language-source-alist
 '(wat "https://github.com/wasm-lsp/tree-sitter-wasm" nil "wat/src"))
;; wast
(add-to-list
 'treesit-language-source-alist
 '(wast "https://github.com/wasm-lsp/tree-sitter-wasm" nil "wast/src"))

Then run M-x treesit-install-language-grammar and select wat/wast to install the shared libraries.

• Clone this repository
• Add the following to your emacs config

(require "[cloned nverno/wat-ts-mode]/wat-ts-mode.el")

If you get the following warning:

⛔ Warning (treesit): Cannot activate tree-sitter, because tree-sitter
library is not compiled with Emacs [2 times]

Then you do not have tree-sitter support for your emacs installation.

If you get the following warnings:

⛔ Warning (treesit): Cannot activate tree-sitter, because language grammar for wat is unavailable (not-found): (libtree-sitter-wat libtree-sitter-wat.so) No such file or directory

then the wat/wast grammar files are not properly installed on your system.