xtermjs/xterm.js

A terminal for the web

Stars: 21.2k
Forks: 2k
Open beginner issues: 3
Indexed issues: 191
Avg merge: 1d 3h
Merged PRs (30d): 3

Dominant language: TypeScript
License: MIT
Last GitHub push: Aug 30, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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191 open issues indexed

A resize updates the scrollbar's extent but not its position, so the next wheel tick jumps hundreds of lines Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

xtermjs/xterm.js#6172 · 1 comment · Opened Sep 17, 2026
"@xterm/addon-search": "^0.16.0", bugs Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

xtermjs/xterm.js#6171 · Opened Sep 16, 2026
win32-input-mode: virtual key comes from KeyboardEvent.code (US QWERTY), so non-US layouts and NumLock-off numpad keys send the wrong Vk Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

xtermjs/xterm.js#6169 · Opened Sep 13, 2026
Serialize addon restores a cursor one column left after a full-row write Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

xtermjs/xterm.js#6165 · 1 comment · Opened Sep 9, 2026
Buffer.resize never reduces maxLength of an unfilled buffer — a shrink before the alternate screen is first used gives the alt buffer phantom scrollback (ybase > 0), duplicating rows after a later grow Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

xtermjs/xterm.js#6163 · Opened Sep 9, 2026
IME preedit is not aligned to the cell grid when the WebGL renderer floors the cell width Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

xtermjs/xterm.js#6161 · Opened Sep 8, 2026
resize() while an async parser handler is pending leaves the parser in FAIL; terminal stops rendering Open

type/bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

xtermjs/xterm.js#6154 · 3 comments · Opened Sep 5, 2026
[addon-webgl] Multi-glyph atlas canvas too narrow for fractional advances — long joined runs clip and drift vs the cell grid Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

xtermjs/xterm.js#6153 · Opened Sep 4, 2026
[addon-ligatures] findLigatureRanges returns context fragments that reshape incorrectly for position-dependent calt fonts Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

xtermjs/xterm.js#6152 · Opened Sep 4, 2026
[addon-ligatures] Font acquisition never reaches queryLocalFonts — navigator.fonts.query() is obsolete Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

xtermjs/xterm.js#6151 · Opened Sep 4, 2026
addon-search: findNext overflows the stack / freezes on one very long wrapped line Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

xtermjs/xterm.js#6148 · 2 comments · Opened Sep 4, 2026
First IME-committed character is dropped when input fires before keydown (macOS) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

xtermjs/xterm.js#6144 · 1 reaction · Opened Aug 31, 2026
addon-webgl 0.19 throws on dispose under @xterm/xterm 5.5.0 (reads `_core._store`, absent in 5.5) despite ^5.0.0 peer range Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

xtermjs/xterm.js#6143 · Opened Aug 31, 2026
slick register API for extended attribs Open

area/addon/image area/buffer area/parser area/performance type/debt type/enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

xtermjs/xterm.js#6142 · 7 comments · Opened Aug 30, 2026
Alt+click cursor positioning emits one arrow sequence per cell, overshooting across wide (CJK) characters Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

xtermjs/xterm.js#6135 · Opened Aug 26, 2026
Set up npm trusted publishing for releases Open

type/automation

xtermjs/xterm.js#6134 · 1 assignee · Opened Aug 24, 2026
Kitty graphics: Track placements independently from text cells Open

area/addon/image

Difficulty 5/5 Over a week Newbie friendliness 45/100

xtermjs/xterm.js#6132 · 3 comments · Opened Aug 24, 2026
Shrinking the terminal discards content on the cursor's line: rows are truncated before reflow is skipped Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

xtermjs/xterm.js#6130 · Opened Aug 24, 2026
animation support for IIP Open

area/addon/image area/performance type/enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

xtermjs/xterm.js#6126 · 5 comments · Opened Aug 22, 2026
scrollbar visibility handling partially broken Open

area/performance type/bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

xtermjs/xterm.js#6123 · Opened Aug 20, 2026
better buffer trim handling Open

area/performance type/enhancement type/proposal

Difficulty 4/5 3-5 days Newbie friendliness 48/100

xtermjs/xterm.js#6121 · Opened Aug 20, 2026
Viewport keeps a phantom scroll range when a resize lands while the renderer is paused (permanent in the alternate buffer) Open

Difficulty 4/5 3-5 days Newbie friendliness 67/100

xtermjs/xterm.js#6117 · Opened Aug 19, 2026
WebGL: opaque background rectangle painted behind italic/dim cells when the theme background is transparent (alpha hard-coded in RectangleRenderer) Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

xtermjs/xterm.js#6116 · 1 reaction · Opened Aug 19, 2026
Cursor blink never starts on 6.1.0-beta in a headless X (Xvfb) Electron environment — works on 6.0.0 in the same environment Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

xtermjs/xterm.js#6113 · Opened Aug 18, 2026
IME single-character commits are silently dropped when the app enables the Kitty keyboard protocol Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

xtermjs/xterm.js#6112 · 2 comments · Opened Aug 17, 2026
WidthCache measure container on document.body fails axe region (missing aria-hidden) Open

Difficulty 1/5 Under an hour Newbie friendliness 84/100

xtermjs/xterm.js#6109 · 6 comments · Opened Aug 16, 2026
Inertial fling sends NaN mouse coordinates when mouse reporting is on Open

Difficulty 4/5 3-5 days Newbie friendliness 70/100

xtermjs/xterm.js#6108 · 1 comment · Opened Aug 16, 2026
massive performance degradation Open

area/performance important type/bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

xtermjs/xterm.js#6106 · 3 comments · Opened Aug 14, 2026
[Bug] Wheel input is silently dropped in the alt buffer when consumeWheelEvent() rounds to zero lines Open

Difficulty 3/5 1-2 days Newbie friendliness 15/100

xtermjs/xterm.js#6105 · 1 comment · Opened Aug 14, 2026
TimeoutTimer.cancelAndSet performance antipattern Open

area/performance

Difficulty 5/5 Over a week Newbie friendliness 42/100

xtermjs/xterm.js#6102 · Opened Aug 13, 2026
webtransport demo Open

area/addon/attach area/demo area/performance type/enhancement type/proposal

xtermjs/xterm.js#6100 · 2 comments · 1 assignee · Opened Aug 13, 2026
Esbuild bundles the node version of the dependencies Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

xtermjs/xterm.js#6096 · Opened Aug 10, 2026
Fast IME typing drops a committed composition: `_isSendingComposition` cancels every pending send, not just one Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

xtermjs/xterm.js#6089 · Opened Aug 5, 2026
Document-level mouseup/mousemove listeners from _bindMouse survive dispose() during an active drag-select, throwing on later disposed-RenderService access Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

xtermjs/xterm.js#6086 · 2 comments · Opened Aug 3, 2026
addon-unicode-graphemes: trie header is read via DataView(data.buffer) ignoring byteOffset, so a pooled base64 decode silently corrupts widths Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

xtermjs/xterm.js#6079 · Opened Jul 28, 2026
Hidden textarea accumulates typed text, and `CompositionHelper._handleAnyTextareaChanges` re-emits the whole value as input Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

xtermjs/xterm.js#6078 · 1 comment · Opened Jul 26, 2026
WebGL: glyph atlas grows unbounded when the background color varies per cell (animated backgrounds, heatmaps, diffs) Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

xtermjs/xterm.js#6074 · Opened Jul 25, 2026
DEC 2026 synchronized output renders at ~1 fps under continuous full-screen animation Open

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

xtermjs/xterm.js#6071 · Opened Jul 25, 2026
Document-level mouse listeners survive Terminal.dispose() in 6.0.0, throwing TypeError from RenderService.dimensions on the next mouseup Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

xtermjs/xterm.js#6070 · 1 comment · Opened Jul 24, 2026
WebglAddon.dispose() does not release the underlying WebGL2 context Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

xtermjs/xterm.js#6068 · 2 comments · Opened Jul 24, 2026
Ctrl+<letter> and Escape are silently dropped under a CJK IME (keyCode 229) Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

xtermjs/xterm.js#6065 · Opened Jul 24, 2026
`Buffer.resize` can leave viewport rows with no live `BufferLine` when growing rows with `ybase > 0` (6.0.0) — uncaught TypeErrors in `lineFeed` and `_eraseInBufferLine` Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

xtermjs/xterm.js#6063 · 1 comment · Opened Jul 23, 2026
Firefox paste broken by a false-positive Node check Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

xtermjs/xterm.js#6062 · 2 comments · Opened Jul 23, 2026
DOM renderer: wide-char letter-spacing compensation broken by Chrome's default CJK punctuation compression (text-spacing-trim) Open

Difficulty 1/5 Under an hour Newbie friendliness 82/100

xtermjs/xterm.js#6058 · Opened Jul 19, 2026
Published @xterm/headless has a broken `module` field and no `exports` map Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

xtermjs/xterm.js#6052 · 1 comment · Opened Jul 15, 2026
Composition commit silently truncated when the IME replaces the whole textarea value (Windows TSF / Microsoft Pinyin) Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

xtermjs/xterm.js#6049 · Opened Jul 15, 2026
Deferred textarea diff in `_handleAnyTextareaChanges` duplicates or drops characters on key rollover when IME reports keyCode=229 (companion defect to #5887) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

xtermjs/xterm.js#6045 · Opened Jul 13, 2026
Pixel-smooth trackpad scrolling without changing row layout Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

xtermjs/xterm.js#6040 · Opened Jul 5, 2026
fcitx5 commits selection key instead of Chinese candidate when application preedit is disabled Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

xtermjs/xterm.js#6036 · 2 comments · 1 reaction · Opened Jul 3, 2026
Optional theme color for bold text (theme.boldColor) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

xtermjs/xterm.js#6032 · 1 comment · 1 reaction · Opened Jun 24, 2026

A short digest of beginner-friendly GitHub issues.