Code Actions Command Menu Block for React

So you can see it without a click. On load the menu is the code view and the Command drawn inline under a picture of the editor, in a plain shell that is not modal, so nothing is trapped, hidden or focused and the page around the preview keeps working. The header's field opens the real command dialog, modal, with its focus trap, Escape and focus return, and the inline copy stays closed until a reload. Both show the same Palette and share the block's state, so the fixes you applied in the copy are in the document the dialog opens with. In your app keep the dialog and drop the copy: the "in-place" state, the scrim with its shell and the Escape and blur effects.

Each check is a small function of the whole document and one line. The unused-import check lists the names inside the braces and drops those that no other line mentions as a whole word; the const check looks for a let whose name no other line assigns again; the wrap check needs a line longer than the limit with at least two calls chained by dots outside brackets and strings. The list is whatever those return for the chosen line, so choosing another line gives another list, and the flags in the code view come from the same functions.

With a wavy underline in the text colour under the exact words at fault, and in words: a line's button is named with what is wrong ("Line 3, let retries is never reassigned") and the chosen line's problems are written under the code view. A line that was rewritten carries a bar at its start and the word "changed" in its name, and the line you chose has its number filled.

Every action pushes the document, the chosen line and what was rewritten onto a history before it applies, and Undo (the button, or Ctrl or ⌘ Z while focus is in the menu) pops it. The search field's own undo of typing is replaced by this while the menu is focused, and the button says nothing is left when the history is empty. An action with nothing to change, such as single quotes on a line with no double quotes, says so and adds nothing to the history.

All of it. The document, the history and the changes are state in the block; nothing is saved, linted or run. In your app replace START_TEXT with the buffer, keep problemsOf and allRows as the place your own checks plug in, and apply the result of apply through your editor's transaction so its undo and collaboration keep working.

Yes. Tab reaches the line buttons (a group: the arrow keys move between lines and Space chooses one), type in the search field to filter the list, the arrow keys move through it, Enter applies, and Escape closes the menu and puts focus on the field. Ctrl or ⌘ K opens the dialog while focus is inside the block, and only then. The rows are options of a cmdk listbox; the block turns off its own fuzzy filter and lists the rows itself. The code is read left to right in every direction of page.