Revert xterm.js v6.0.0 upgrade back to v5.5.0#1226
Conversation
📝 WalkthroughWalkthroughThis PR changes the desktop app's xterm integration: it removes an explicit Vite alias for Changes
Sequence DiagramsequenceDiagram
participant App as Terminal Component
participant Helper as Renderer Helper
participant Canvas as Canvas Renderer
participant WebGL as WebGL Renderer
participant DOM as DOM Renderer
participant Viewport as DOM Viewport
App->>Helper: loadRenderer()
alt Platform is macOS
Helper->>Canvas: tryLoadCanvas()
Canvas-->>Helper: success / failure
alt Canvas fails
Helper->>WebGL: loadWebGL()
WebGL-->>Helper: loaded / failed
end
else Other Platform
Helper->>WebGL: loadWebGL()
WebGL-->>Helper: loaded / failed
alt WebGL context lost
Helper->>Canvas: attempt Canvas fallback
Canvas-->>Helper: success / failure
alt Canvas fails
Helper->>DOM: fallback to DOM
DOM-->>Helper: rendering active
end
end
end
Helper-->>App: update rendering kind
App->>Viewport: attach scroll listener
Viewport->>App: user scroll event
App->>App: scrollToBottom(behavior)
App->>Viewport: viewport.scrollTo({ top: scrollHeight, behavior })
Viewport-->>App: scroll applied
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Actionable comments posted: 3
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⚠️ Outside diff range comments (1)
apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/helpers.ts (1)
88-156:⚠️ Potential issue | 🟡 MinorUpdate
TerminalRenderer.kindto reflect actual renderer after context-loss fallback.Currently,
kindis reassigned within thewebglAddon.onContextLoss()callback (lines 127, 133), but the returned object'skindproperty—captured at function return time—won't reflect these changes. If any code later readsrendererRef.current.kind(for logging, telemetry, or feature gating), it will report stale state even after a Canvas fallback.Create a mutable
rendererStateobject and introduce asetKind()helper to keep both the local variable and the returned object in sync:Proposed fix
function loadRenderer(xterm: XTerm): TerminalRenderer { let renderer: WebglAddon | CanvasAddon | null = null; let webglAddon: WebglAddon | null = null; let kind: TerminalRenderer["kind"] = "dom"; + const rendererState: TerminalRenderer = { + kind, + dispose: () => renderer?.dispose(), + clearTextureAtlas: undefined, + }; + const setKind = (nextKind: TerminalRenderer["kind"]) => { + kind = nextKind; + rendererState.kind = nextKind; + }; const preferred = getPreferredRenderer(); if (preferred === "dom") { return { kind: "dom", dispose: () => {}, clearTextureAtlas: undefined }; } const tryLoadCanvas = () => { try { renderer = new CanvasAddon(); xterm.loadAddon(renderer); - kind = "canvas"; + setKind("canvas"); } catch { // Canvas fallback failed, use default renderer } }; if (preferred === "canvas") { tryLoadCanvas(); - return { - kind, - dispose: () => renderer?.dispose(), - clearTextureAtlas: undefined, - }; + return rendererState; } try { webglAddon = new WebglAddon(); webglAddon.onContextLoss(() => { webglAddon?.dispose(); webglAddon = null; try { renderer = new CanvasAddon(); xterm.loadAddon(renderer); - kind = "canvas"; + setKind("canvas"); // Force refresh after context loss recovery xterm.refresh(0, xterm.rows - 1); } catch { // Canvas fallback failed, use default renderer renderer = null; - kind = "dom"; + setKind("dom"); } }); xterm.loadAddon(webglAddon); renderer = webglAddon; - kind = "webgl"; + setKind("webgl"); } catch { tryLoadCanvas(); } - return { - kind, - dispose: () => renderer?.dispose(), - clearTextureAtlas: webglAddon - ? () => { - try { - webglAddon?.clearTextureAtlas(); - } catch (error) { - console.warn("[Terminal] WebGL clearTextureAtlas() failed:", error); - } - } - : undefined, - }; + rendererState.clearTextureAtlas = webglAddon + ? () => { + try { + webglAddon?.clearTextureAtlas(); + } catch (error) { + console.warn("[Terminal] WebGL clearTextureAtlas() failed:", error); + } + } + : undefined; + return rendererState; }
🤖 Fix all issues with AI agents
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/config.ts`:
- Around line 45-46: The hardcoded xterm option values fastScrollModifier and
fastScrollSensitivity should be pulled into named module-level constants for
consistency; create constants (e.g., FAST_SCROLL_MODIFIER and
FAST_SCROLL_SENSITIVITY) at the top of the module and replace the inline values
in the config object (fastScrollModifier: "alt" and fastScrollSensitivity: 5)
with those constants, keeping the same values and exporting or keeping scope
identical to existing constants pattern in the file.
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/helpers.ts`:
- Around line 99-107: The catch blocks in tryLoadCanvas (and the other
renderer-loading blocks around lines referenced) silently swallow errors; update
those catches to log the error with a consistent prefixed context (e.g.
"[terminal/renderer]") including the thrown error message and stack, and if a
partially constructed addon instance (renderer or similar) exists call its
dispose() (or appropriate cleanup) before continuing; specifically modify the
tryLoadCanvas flow that creates CanvasAddon and calls xterm.loadAddon(renderer)
to catch (err) -> console.error("[terminal/renderer] CanvasAddon load failed:",
err) and dispose renderer if set, and apply the same pattern to the other
renderer load attempts that currently have empty catches.
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/utils.ts`:
- Around line 8-20: The function scrollToBottom currently uses a non-standard
ScrollBehavior value "instant" and positional params; change its signature to
accept an options object (e.g., scrollToBottom({ terminal, behavior = "auto" }:
{ terminal: Terminal; behavior?: ScrollBehavior })) and replace the default
"instant" with the standard "auto" (or allow "smooth") so typing matches
lib.dom; keep the existing logic (querySelector(".xterm-viewport") then
viewport.scrollTo({...}) or terminal.scrollToBottom() fallback) but pass the
behavior through the options object, and update all callers from
scrollToBottom(xterm) to scrollToBottom({ terminal: xterm }).
| fastScrollModifier: "alt", | ||
| fastScrollSensitivity: 5, |
There was a problem hiding this comment.
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🌐 Web query:
@xterm/xterm 5.5.0 fastScrollModifier fastScrollSensitivity ITerminalOptions API
💡 Result:
In @xterm/xterm 5.5.0, these are ITerminalOptions fields:
interface ITerminalOptions {
fastScrollModifier?: 'none' | 'alt' | 'ctrl' | 'shift';
fastScrollSensitivity?: number;
}fastScrollModifier: which modifier key must be held to enable “fast scrolling” (multiplied scroll speed). In v5+, use'none'(notundefined) to disable the modifier requirement. [2] [3]fastScrollSensitivity: the scroll-speed multiplier used during fast scrolling (when the modifier is held). [1] [3]
Sources: xterm.js API docs for ITerminalOptions [1], xterm.js v5.5.0 release notes (and v5 API note about 'none') [2], jsdocs.io API listing for the option types [3].
Extract fastScrollModifier and fastScrollSensitivity to named constants.
These xterm 5.5.0 options are valid and working, but should follow the file's existing pattern of extracting hardcoded values to constants at the module top for consistency and maintainability.
Suggested constant extraction
+const FAST_SCROLL_MODIFIER = "alt";
+const FAST_SCROLL_SENSITIVITY = 5;
+
export const TERMINAL_OPTIONS: ITerminalOptions = {
cursorBlink: true,
fontSize: 14,
fontFamily: TERMINAL_FONT_FAMILY,
theme: TERMINAL_THEME,
allowProposedApi: true,
scrollback: 10000,
// Allow Option+key to type special characters on international keyboards (e.g., Option+2 = @)
macOptionIsMeta: false,
cursorStyle: "block",
cursorInactiveStyle: "outline",
- fastScrollModifier: "alt",
- fastScrollSensitivity: 5,
+ fastScrollModifier: FAST_SCROLL_MODIFIER,
+ fastScrollSensitivity: FAST_SCROLL_SENSITIVITY,
screenReaderMode: false,
};🤖 Prompt for AI Agents
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/config.ts`
around lines 45 - 46, The hardcoded xterm option values fastScrollModifier and
fastScrollSensitivity should be pulled into named module-level constants for
consistency; create constants (e.g., FAST_SCROLL_MODIFIER and
FAST_SCROLL_SENSITIVITY) at the top of the module and replace the inline values
in the config object (fastScrollModifier: "alt" and fastScrollSensitivity: 5)
with those constants, keeping the same values and exporting or keeping scope
identical to existing constants pattern in the file.
| const tryLoadCanvas = () => { | ||
| try { | ||
| renderer = new CanvasAddon(); | ||
| xterm.loadAddon(renderer); | ||
| kind = "canvas"; | ||
| } catch { | ||
| // Canvas fallback failed, use default renderer | ||
| } | ||
| }; |
There was a problem hiding this comment.
Log renderer load failures instead of silently swallowing them.
Right now the new catch blocks drop errors, making GPU renderer failures hard to diagnose. Log with a prefixed context and dispose partially created addons.
Proposed fix
const tryLoadCanvas = () => {
try {
renderer = new CanvasAddon();
xterm.loadAddon(renderer);
kind = "canvas";
- } catch {
- // Canvas fallback failed, use default renderer
+ } catch (error) {
+ console.warn("[Terminal/renderer] Canvas addon failed to load:", error);
+ renderer?.dispose();
+ renderer = null;
}
};
@@
webglAddon.onContextLoss(() => {
webglAddon?.dispose();
webglAddon = null;
try {
renderer = new CanvasAddon();
xterm.loadAddon(renderer);
kind = "canvas";
// Force refresh after context loss recovery
xterm.refresh(0, xterm.rows - 1);
- } catch {
- // Canvas fallback failed, use default renderer
- renderer = null;
- kind = "dom";
+ } catch (error) {
+ console.warn(
+ "[Terminal/renderer] Canvas fallback after WebGL context loss failed:",
+ error,
+ );
+ renderer?.dispose();
+ renderer = null;
+ kind = "dom";
}
});
@@
- } catch {
- tryLoadCanvas();
+ } catch (error) {
+ console.warn("[Terminal/renderer] WebGL addon failed to load:", error);
+ webglAddon?.dispose();
+ webglAddon = null;
+ tryLoadCanvas();
}Also applies to: 124-134, 140-142
🤖 Prompt for AI Agents
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/helpers.ts`
around lines 99 - 107, The catch blocks in tryLoadCanvas (and the other
renderer-loading blocks around lines referenced) silently swallow errors; update
those catches to log the error with a consistent prefixed context (e.g.
"[terminal/renderer]") including the thrown error message and stack, and if a
partially constructed addon instance (renderer or similar) exists call its
dispose() (or appropriate cleanup) before continuing; specifically modify the
tryLoadCanvas flow that creates CanvasAddon and calls xterm.loadAddon(renderer)
to catch (err) -> console.error("[terminal/renderer] CanvasAddon load failed:",
err) and dispose renderer if set, and apply the same pattern to the other
renderer load attempts that currently have empty catches.
| export function scrollToBottom( | ||
| terminal: Terminal, | ||
| behavior: ScrollBehavior = "instant", | ||
| ): void { | ||
| const viewport = terminal.element?.querySelector(".xterm-viewport"); | ||
| if (viewport) { | ||
| viewport.scrollTo({ | ||
| top: viewport.scrollHeight, | ||
| behavior, | ||
| }); | ||
| } else { | ||
| terminal.scrollToBottom(); | ||
| } |
There was a problem hiding this comment.
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"auto": "Default, equivalent to smooth",
"smooth": "Scroll smoothly",
"instant": "Scroll instantly"
}
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Replace non-standard "instant" with standard ScrollBehavior value and use options object per guidelines.
ScrollBehavior from lib.dom only supports "auto" or "smooth", not "instant"—this causes a type error. Additionally, this function has 2 parameters and should use an options object per the coding guidelines.
All 7 call sites currently pass only the terminal argument, making the refactoring straightforward:
♻️ Suggested refactor
-export function scrollToBottom(
- terminal: Terminal,
- behavior: ScrollBehavior = "instant",
-): void {
+type ScrollToBottomOptions = {
+ terminal: Terminal;
+ behavior?: ScrollBehavior;
+};
+
+export function scrollToBottom({
+ terminal,
+ behavior = "auto",
+}: ScrollToBottomOptions): void {
const viewport = terminal.element?.querySelector(".xterm-viewport");
if (viewport) {
viewport.scrollTo({
top: viewport.scrollHeight,
behavior,
});
} else {
terminal.scrollToBottom();
}
}Update call sites from scrollToBottom(xterm) to scrollToBottom({ terminal: xterm }) (or use alias { terminal } if xterm is already the variable name).
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| export function scrollToBottom( | |
| terminal: Terminal, | |
| behavior: ScrollBehavior = "instant", | |
| ): void { | |
| const viewport = terminal.element?.querySelector(".xterm-viewport"); | |
| if (viewport) { | |
| viewport.scrollTo({ | |
| top: viewport.scrollHeight, | |
| behavior, | |
| }); | |
| } else { | |
| terminal.scrollToBottom(); | |
| } | |
| type ScrollToBottomOptions = { | |
| terminal: Terminal; | |
| behavior?: ScrollBehavior; | |
| }; | |
| export function scrollToBottom({ | |
| terminal, | |
| behavior = "auto", | |
| }: ScrollToBottomOptions): void { | |
| const viewport = terminal.element?.querySelector(".xterm-viewport"); | |
| if (viewport) { | |
| viewport.scrollTo({ | |
| top: viewport.scrollHeight, | |
| behavior, | |
| }); | |
| } else { | |
| terminal.scrollToBottom(); | |
| } | |
| } |
🤖 Prompt for AI Agents
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/utils.ts`
around lines 8 - 20, The function scrollToBottom currently uses a non-standard
ScrollBehavior value "instant" and positional params; change its signature to
accept an options object (e.g., scrollToBottom({ terminal, behavior = "auto" }:
{ terminal: Terminal; behavior?: ScrollBehavior })) and replace the default
"instant" with the standard "auto" (or allow "smooth") so typing matches
lib.dom; keep the existing logic (querySelector(".xterm-viewport") then
viewport.scrollTo({...}) or terminal.scrollToBottom() fallback) but pass the
behavior through the options object, and update all callers from
scrollToBottom(xterm) to scrollToBottom({ terminal: xterm }).
…-6-upgrade # Conflicts: # apps/desktop/package.json # bun.lock
There was a problem hiding this comment.
Actionable comments posted: 1
🤖 Fix all issues with AI agents
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/helpers.ts`:
- Around line 62-69: Update the top doc comment to accurately describe the
actual renderer selection flow: note that the code prefers Canvas when the
preferred renderer is "canvas" (and on macOS), so WebGL is not attempted in that
case; otherwise it will try WebGL first and fall back to Canvas if WebGL fails.
Reference the TerminalRenderer type (kind: "webgl" | "canvas" | "dom") when
clarifying the ordering and the platform/preference exceptions so the comment
matches the implemented logic.
| /** | ||
| * Load GPU-accelerated renderer with automatic fallback. | ||
| * Tries WebGL first, falls back to DOM if WebGL fails. | ||
| * This follows VS Code's approach: WebGL → DOM (canvas addon removed in xterm.js 6.0). | ||
| * Tries WebGL first, falls back to Canvas if WebGL fails. | ||
| */ | ||
| export type TerminalRenderer = { | ||
| kind: "webgl" | "dom"; | ||
| kind: "webgl" | "canvas" | "dom"; | ||
| dispose: () => void; | ||
| clearTextureAtlas?: () => void; |
There was a problem hiding this comment.
Adjust the comment to reflect the canvas-preferred path.
Right now the doc says “WebGL first,” but when the preferred renderer is "canvas" (or on macOS), WebGL isn’t attempted. Consider updating the wording to match the actual flow.
✏️ Suggested comment tweak
- * Tries WebGL first, falls back to Canvas if WebGL fails.
+ * Tries the preferred renderer first (WebGL by default, Canvas on macOS),
+ * falling back to Canvas or DOM as needed.📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| /** | |
| * Load GPU-accelerated renderer with automatic fallback. | |
| * Tries WebGL first, falls back to DOM if WebGL fails. | |
| * This follows VS Code's approach: WebGL → DOM (canvas addon removed in xterm.js 6.0). | |
| * Tries WebGL first, falls back to Canvas if WebGL fails. | |
| */ | |
| export type TerminalRenderer = { | |
| kind: "webgl" | "dom"; | |
| kind: "webgl" | "canvas" | "dom"; | |
| dispose: () => void; | |
| clearTextureAtlas?: () => void; | |
| /** | |
| * Load GPU-accelerated renderer with automatic fallback. | |
| * Tries the preferred renderer first (WebGL by default, Canvas on macOS), | |
| * falling back to Canvas or DOM as needed. | |
| */ | |
| export type TerminalRenderer = { | |
| kind: "webgl" | "canvas" | "dom"; | |
| dispose: () => void; | |
| clearTextureAtlas?: () => void; |
🤖 Prompt for AI Agents
In
`@apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/Terminal/helpers.ts`
around lines 62 - 69, Update the top doc comment to accurately describe the
actual renderer selection flow: note that the code prefers Canvas when the
preferred renderer is "canvas" (and on macOS), so WebGL is not attempted in that
case; otherwise it will try WebGL first and fall back to Canvas if WebGL fails.
Reference the TerminalRenderer type (kind: "webgl" | "canvas" | "dom") when
clarifying the ordering and the platform/preference exceptions so the comment
matches the implemented logic.
1 participant
Summary
@xterm/addon-canvasand@xterm/addon-web-linkspackages that were removed in v6FilesView/types.ts(dead react-arborist import)Test plan
Summary by CodeRabbit
New Features
Bug Fixes
Chores