Moving to Doom Emacs!

.emacs.d/modules/lang/julia/autoload.el

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+;;; lang/julia/autoload.el -*- lexical-binding: t; -*-
+
+;; `ob-julia' needs this variable to be defined, but it's defined in
+;; `ess-custom', which won't be available if you're using :lang julia and not
+;; :lang ess.
+;;;###autoload (defvar inferior-julia-program-name (or (executable-find "julia-basic") "julia"))
+
+;;;###autoload
+(defun +julia/open-repl ()
+  "Run an inferior instance of `julia' inside Emacs."
+  (interactive)
+  (if (require 'julia-repl nil t)
+      (julia-repl)
+    (let ((buffer (get-buffer-create "*Julia*")))
+      (unless (comint-check-proc "*Julia*")
+        (apply #'make-comint-in-buffer "Julia" "*Julia*" julia-program julia-arguments))
+      (pop-to-buffer buffer)
+      (with-current-buffer buffer
+        (inferior-julia-mode))
+      buffer)))

.emacs.d/modules/lang/julia/config.el

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+;;; lang/julia/config.el -*- lexical-binding: t; -*-
+
+(use-package! julia-mode
+  :interpreter "julia"
+  :config
+  (set-repl-handler! 'julia-mode #'+julia/open-repl)
+
+  ;; Borrow matlab.el's fontification of math operators
+  ;; From <https://ogbe.net/emacsconfig.html>
+  (dolist (mode '(julia-mode ess-julia-mode))
+    (font-lock-add-keywords
+     mode
+     `((,(let ((OR "\\|"))
+           (concat "\\(" ;; stolen `matlab.el' operators first
+                   "[<>!]=?" OR
+                   "\\.[/*^']" OR
+                   "==" OR
+                   "=>" OR
+                   "\\<xor\\>" OR
+                   "[-+*\\/^&|$]=?" OR ;; this has to come before next (updating operators)
+                   "[-!^&|*+\\/~:]" OR
+                   ;; more extra julia operators follow
+                   "[%$]" OR
+                   ;; bitwise operators
+                   ">>>" OR ">>" OR "<<" OR
+                   ">>>=" OR ">>" OR "<<" OR
+                   ;; comparison
+                   "[<>!]=?" OR
+                   "\\)"))
+        1 font-lock-type-face)))))
+
+
+(after! julia-repl
+  (add-hook 'julia-repl-hook #'julia-repl-use-emacsclient))

.emacs.d/modules/lang/julia/packages.el

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+;; -*- no-byte-compile: t; -*-
+;;; lang/julia/packages.el
+
+(package! julia-mode)
+(package! julia-repl)