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.emacs.d/uno/modules/lang/js/yarn.org

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Language - JavaScript - Yarn

Package

Define JavaScript language package.

  (use-package emacs
    :after (uno-lang-js uno-dev-lsp projectile)
    :config
    (provide 'uno-lang-js-yarn))

LSP Integration 

  (use-package emacs
    :after uno-lang-js-yarn
    :init
    (defun uno/lang/js/yarn/add-to-local-lsp (name file)
      "Add NAME dependency from FILE to local yarn instance."
      (when (uno/lang/js/yarn/local-p file)
        (lsp-dependency name `(:yarn-local ,file))
        t))
    (defun uno/lang/js/yarn/check ()
      "Set up support with local Yarn instance."
      (when (uno/lang/js/yarn/local-p)
        (require 'lsp-javascript)
        (make-local-variable 'lsp-enabled-clients)
        (plist-put lsp-deps-providers
                   :yarn-local '(:path uno/lang/js/yarn/local-provider))
        (setq-local lsp-auto-guess-root t)
        (run-hooks 'uno-lang-js-yarn-hook)))
    (defun uno/lang/js/yarn/local-p (&optional file)
      "Check if Yarn SDK is available locally."
      (if file
          (file-exists-p (uno/lang/js/yarn/local-provider file))
        (file-directory-p (uno/lang/js/yarn/local-provider))))
    (defun uno/lang/js/yarn/local-provider (&optional path)
      "Provide path for local yarn instance relative to PATH."
      (concat (projectile-project-root) ".yarn/sdks/" path)))

ESLint Integration 

  (use-package emacs
    :after (uno-lang-js-yarn flycheck)
    :hook
    (uno-lang-js-yarn . uno/lang/js/eslint/add)
    :init
    (defun uno/lang/js/eslint/add ()
      "Add support for ESLint."
      (when (uno/lang/js/yarn/local-p "eslint/bin/eslint.js")
        (let ((-eslint-full (uno/lang/js/yarn/local-provider "eslint/bin/eslint.js"))
              (-node-path (uno/lang/js/yarn/local-provider)))
          (setq-local
           flycheck-javascript-eslint-executable -eslint-full
           lsp-eslint-node-path -node-path
           lsp-eslint-package-manager "yarn"))
        (push 'eslint lsp-enabled-clients)))
    (uno/add-useless-buffer "\\*eslint\\*")
    (uno/add-useless-buffer "\\*eslint::.*\\*"))