Function Host Debugger View by nturinski · Pull Request #4883 · microsoft/vscode-azurefunctions

nturinski · 2026-01-14T22:56:18Z

This PR adds a Function Host Debug view to the Azure Functions extension. The view appears in the Run and Debug panel and lists running Function Host tasks along with their recent error output.

A new tree view provider backs this view and supplies nodes for active hosts and error entries. The view includes commands to refresh the data, clear recorded errors, view or copy recent logs, and send an error to Copilot. These commands are available from the view toolbar and node context menus.

The PR also introduces a setting to always show the Function Host Debug view, regardless of context.

Supporting changes include exporting shared utilities for identifying host error logs and cleaning log output, extending command handling to accept argument arrays, and updating the Functions task provider to allow additional CLI arguments in task definitions.

No host running (only visible if always show setting is enabled)

Function host running with no errors

Function host running with an error

Location of Ask Copilot context menu

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

…ions into nat/fileBasedPickProcess

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

…ions into nat/fileBasedPickProcess

Copilot · 2026-01-15T00:03:35Z

@nturinski I've opened a new pull request, #4886, to work on those changes. Once the pull request is ready, I'll request review from you.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Copilot · 2026-01-15T00:05:27Z

@nturinski I've opened a new pull request, #4887, to work on those changes. Once the pull request is ready, I'll request review from you.

…4885) * Initial plan * Add JSDoc documentation for IStartFuncProcessResult interface Co-authored-by: nturinski <5290572+nturinski@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: nturinski <5290572+nturinski@users.noreply.github.com>

* Initial plan * Add AbortController to prevent infinite stream iteration Co-authored-by: nturinski <5290572+nturinski@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: nturinski <5290572+nturinski@users.noreply.github.com>

Copilot · 2026-01-15T00:21:52Z

@nturinski I've opened a new pull request, #4888, to work on those changes. Once the pull request is ready, I'll request review from you.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Removed exhaustive check for FuncHostDebugNode.

bwateratmsft · 2026-01-16T18:54:48Z

src/debug/FuncTaskProvider.ts

        const funcCliPath = await getFuncCliPath(context, folder);
+        const args = (definition?.args || []) as string[];
+        if (args.length > 0) {
+            command = `${command} ${args.join(' ')}`;


Since the VSCode Task API accepts argument lists, why not use that?

bwateratmsft · 2026-01-16T18:58:23Z

src/utils/copilotChat.ts

+    const candidates: Array<{ command: string; args: unknown[] }> = [
+        // Newer VS Code variants
+        { command: 'workbench.action.chat.open', args: [trimmed] },
+        { command: 'workbench.action.chat.open', args: [{ query: trimmed }] },
+        // Older / alternate variants
+        { command: 'workbench.action.openChat', args: [trimmed] },
+        // Copilot extensions (IDs vary by version)
+        { command: 'github.copilot.openChat', args: [trimmed] },
+        { command: 'github.copilot-chat.openChat', args: [trimmed] },
+    ];


Does the minimum VSCode version we have in this extension exclude any of these?

MicroFish91 · 2026-01-22T23:22:06Z

Very cool, I have it as a todo to review this either tomorrow or early next week!

MicroFish91 · 2026-01-28T00:55:06Z

src/funcCoreTools/funcHostTask.ts

+    return tasks;
+}
+
+async function updateFuncHostDebugContext(): Promise<void> {


I'm running into an issue on error where the Function Host Debug view is not showing up. Well, at least that's what it appeared like initially. In reality, after I set some breakpoints, I realized that it actually is getting shown, but then immediately gets hidden.

I think for some reason this update function is called to show the view, and then for some reason gets called again and causes the view to hide.

My repro steps were: (1) create a DTS project via createNewProject, (2) hit F5, and (3) answer skip for now so nothing gets set for both connections. This causes this func CLI error which I was expecting to show up:

I should be in office tomorrow so if you're not able to repro maybe we can investigate on my machine, lmk!

…ecognized

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

nturinski · 2026-03-12T00:10:09Z

@copilot Do another PR review

Copilot · 2026-03-12T00:10:17Z

@nturinski I've opened a new pull request, #4928, to work on those changes. Once the pull request is ready, I'll request review from you.

alexweininger · 2026-03-12T17:31:54Z

src/funcCoreTools/funcHostTask.ts

            const taskDirectory = taskExecution.options?.cwd?.replace('${workspaceFolder}', (t.taskExecution.task?.scope as vscode.WorkspaceFolder).uri?.path);
-            buildPath = buildPath?.replace('${workspaceFolder}', (t.taskExecution.task?.scope as vscode.WorkspaceFolder).uri?.path);
-            return taskDirectory && buildPath && normalizePath(taskDirectory) === normalizePath(buildPath);
+            const resolvedBuildPath = buildPath?.replace('${workspaceFolder}', (t.taskExecution.task?.scope as vscode.WorkspaceFolder).uri?.path);


task.scope can be a TaskScope enum value (just a number), not only a WorkspaceFolder. Casting it here without checking means .uri?.path evaluates to undefined, and String.replace() will happily coerce that to the literal string "undefined" — so you'd end up with paths like /some/path/undefined/sub instead of the original unresolved string.

We already do the right typeof check in registerFunctionHostDebugView.ts, so maybe something like:

const workspacePath = typeof t.taskExecution.task?.scope === 'object' ? (t.taskExecution.task.scope as vscode.WorkspaceFolder).uri?.path : undefined; const taskDirectory = workspacePath ? taskExecution.options?.cwd?.replace('${workspaceFolder}', workspacePath) : taskExecution.options?.cwd; const resolvedBuildPath = workspacePath ? buildPath?.replace('${workspaceFolder}', workspacePath) : buildPath;

alexweininger · 2026-03-12T17:32:39Z

src/funcCoreTools/funcHostTask.ts

+const funcTaskStartedEmitter = new vscode.EventEmitter<{ scope: vscode.WorkspaceFolder | vscode.TaskScope, execution?: vscode.ShellExecution }>();
 export const onFuncTaskStarted = funcTaskStartedEmitter.event;

+const runningFuncTasksChangedEmitter = new vscode.EventEmitter<void>();
+export const onRunningFuncTasksChanged = runningFuncTasksChangedEmitter.event;


these emitters are never disposed

Yeah, the issue is that we need to create them when the extension is activated, and if we dispose them after a function host task is terminated, they never get instantiated again.

I went ahead and disposed them on deactivation, which I think should happen anyway, but just to be explicit.

…e-azurefunctions into nat/debuggerView

nturinski and others added 30 commits October 24, 2025 10:55

Implementation for debug-isolated flag and streaming func CLI output

6e5b61c

Update src/utils/stream.ts

e9c255d

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Address copilot feedback

067e04d

Merge branch 'nat/fileBasedPickProcess' of https://github.com/microso…

d046ac9

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

Refactor to set up stream in funcHostTasks

606f130

Delete test snippet

44e8382

Add headerto stream file

9726543

Remove the done call

d4f3b56

Update src/debug/FuncTaskProvider.ts

c7618c7

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

WIP waiting for VSCode insiders fix

b8dd0bf

Use onDidStartTerminalShellExecution API instead of proposed

d673a73

Remove proposed files

2dfd68d

Merge branch 'nat/fileBasedPickProcess' of https://github.com/microso…

5035c9a

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

Add note

8a751c8

Remove unused async moniker

e5adbb9

Whoops, wrong async

6454ca8

Little bit of cleaning

544cd45

Remove unusued function helper

52780f7

Last commit, I swears it

3dc0fc5

Move event handler, added note

e36604c

Rename function due to PR feedback

5bfbb42

Merge branch 'main' of https://github.com/microsoft/vscode-azurefunct…

a9c1f08

…ions into nat/fileBasedPickProcess

Merge branch 'nat/fileBasedPickProcess' of https://github.com/microso…

e1ee414

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

Push up WIP

bc365fa

Push up WIP

5d5b38f

Merge branch 'nat/fileBasedPickProcess' of https://github.com/microso…

192b107

…ft/vscode-azurefunctions into nat/fileBasedPickProcess

WIP for postDebug copilot analysis

577a57d

Add debug command activity

e8b519d

WIP for copilot postdebug

e0e5c03

Merge branch 'main' of https://github.com/microsoft/vscode-azurefunct…

8786288

…ions into nat/fileBasedPickProcess

nturinski and others added 2 commits January 14, 2026 16:03

Update src/funcCoreTools/funcHostTask.ts

759fb6a

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/funcCoreTools/funcHostErrorUtils.ts

8ac0664

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Copilot AI mentioned this pull request Jan 15, 2026

Prevent infinite stream iteration when func host task terminates #4887

Merged

Copilot AI and others added 2 commits January 14, 2026 16:15

Copilot AI mentioned this pull request Jan 15, 2026

Fix race condition in terminal event handling by filtering func host events #4888

Draft

nturinski and others added 2 commits January 14, 2026 16:35

Update src/debug/FunctionHostDebugView.ts

24d396e

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Remove exhaustive check from switch statement

2ebf2b6

Removed exhaustive check for FuncHostDebugNode.

bwateratmsft reviewed Jan 16, 2026

View reviewed changes

MicroFish91 reviewed Jan 28, 2026

View reviewed changes

Nathan Turinski added 7 commits February 25, 2026 14:47

merge main

a3fe41a

npm install to update package-lock

ac14622

pull from remote

a479f07

Convert shell args to be an array

26a9e6b

Merge main

2b81dd2

Fix duplicate log entries, fix func start tasks with args not being r…

a331ddc

…ecognized

Clean up some of the code

383bfff

nturinski force-pushed the nat/debuggerView branch from 9c7593c to 383bfff Compare March 12, 2026 00:03

Nathan Turinski and others added 2 commits March 11, 2026 17:06

Fix imports in tests

70b0414

Apply suggestion from @Copilot

55a50cf

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Copilot AI mentioned this pull request Mar 12, 2026

[WIP] Add Function Host Debugger view to Azure Functions extension #4928

Closed

alexweininger approved these changes Mar 12, 2026

View reviewed changes

Nathan Turinski added 2 commits March 12, 2026 16:40

PR feedback

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Merge branch 'nat/debuggerView' of https://github.com/microsoft/vscod…

ef1dadc

…e-azurefunctions into nat/debuggerView

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Function Host Debugger View#4883

Function Host Debugger View#4883
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