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How to Configure dap-mode

Basic Configuration

(use-package dap-mode)

In your TypeScript / JavaScript configuration:

(require 'dap-node)
(dap-node-setup) ;; Automatically installs Node debug adapter if needed

Launching the Debugger

  • dap-debug: Select a template to execute
  • dap-debug-last: Run the most recent template
  • dap-debug-recent: Select a recent template to run
  • dap-disconnect: Disconnect from the debugging session (output buffer retained)
  • dap-delete-session: Delete the current session (output buffer will be deleted)
  • dap-delete-all-sessions: Clean up all debugging sessions

Creating a Debug Template

  • dap-debug-edit-template: Present a debug template for editing
(dap-register-debug-template
  "Debug Server"
  (list :type "node"
        :request "launch"
        :program "${workspaceFolder}/src/server/index.ts"
        :outFiles ["${workspaceFolder}/public/src/server/**/*.js"]
        :name "Debug Server"))

Features

Breakpoints

  • dap-breakpoint-toggle: Toggle a breakpoint on the current line
  • dap-breakpoint-delete-all: Delete all breakpoints in the workspace
  • dap-breakpoint-condition: Set condition for breakpoint
  • dap-breakpoint-hit-condition: Set hit condition, number of hits before breakpoint stops
  • dap-breakpoint-log-message: Set log message for breakpoint (interpolate expressions with {})
  • dap-ui-breakpoints: Show breakpoints panel

Hydra

  • dap-hydra: Quick panel for debugging commands
  • Keep in mind, the Hydra will capture keys unexpectedly (M-x, etc)
  • Automatically show Hydra when debugger stops:
:hook (dap-stopped . (lambda (arg) (call-interactively #'dap-hydra))))

Locals

Expressions

  • dap-ui-expressions-add: Add a watch expression
  • dap-ui-expressions-remove: Remove a watch expression

REPL

  • dap-ui-repl: Start a debugging REPL for your language (if supported)
  • M-n / M-p: Go forward/back in REPL command history

Tooltips

  • dap-tooltip-mode: Turns it on
  • dap-tooltip-at-point: Show the value at the current point
  • Not working?

UI Controls

Loading VS Code debugging configurations

If you’re working in a project where other people use VS Code, this is valuable!

  • Use pre-created config

Configuration

Here’s how to customize the UI to show only what you care about

  • dap-auto-configure-features
  • OR
  • lsp-enable-dap-auto-configure and dap-ui-mode
  • dap-auto-show-output: If t (default), show output buffer when running
  • dap-go-to-output-buffer
(use-package dap-mode
  :custom
  (dap-auto-configure-features '(sessions locals tooltip))
  :config
  (setq lsp-enable-dap-auto-configure nil)
  ;; (dap-ui-mode 1)
  (general-define-key
    :keymaps 'lsp-mode-map
    :prefix lsp-keymap-prefix
    "d" '(dap-hydra t :wk "debugger")))