Release 3.9.0 · xtermjs/xterm.js

🆕 Features

Introduced a new buffer implementation based on typed arrays that recycles memory (#1641, #1731, #1736, #1740, #1793, #1812) via @jerch.

Comparison of the buffer implementations, benchmarked with the demo with 1000 lines scrollback and typical payload (ls output):

buffer based on	memory footprint	GC runtime	input throughput
JS Array	25 - 50 MB JS Heap, 6 MB C++ Heap	15 - 25 %	7 - 8 MB/s
Typed Array	8 - 15 MB JS Heap, 1.5 MB C++ Heap	< 3 %	17 - 19 MB/s

The typed array based implementation is the new default, if you run into issues please report them and switch back to the old buffer using:

new Terminal({ experimentalBufferLineImpl: 'JsArray' })

Fill lines inserted from scrolling with erase attributes (#1706) via @whydoubt
Clear the isWrapped flag on erased lines (eg. from a clear call) (#1720) via @alexr00
Fix an infinite loop in character print code (#1735) via @Tyriar
Fix inverse colors in the DOM renderer and dynamic char atlas (#1739) via @Tyriar
Fix docker image build (#1742) via @AndrienkoAleksandr
Fix NPE in DOM renderer when using the underline attribute (#1748) via @Tyriar
Fix some CJK characters rendering incorrectly when using dynamic char atlas (#1758) via @Tyriar
Improve alt buffer cursor handling to align more with xterm (#1764) via @whydoubt
Only show crosshair cursor when using column select if the terminal has focus (#1772) via @whydoubt
Fix the DOM renderer overlapping with the scroll bar (#1780) via @whydoubt
Fix wheel up event never firing on Firefox (#1782) via @astefanutti
Fix missing control characters in parser (#1783) via @jerch
Fix edge cases in click in selection function which could lead to the wrong cells being selected when double clicking (#1784) via @Tyriar
Fix error preventing the bell audio from working when using multiple terminals (#1787) via @jerch
Web links addon
- Allow colons in the middle of URLs (#1765) via @jrkong
Search addon
- Don't consider _ a word separator in the search addon (#1743) via @alexr00
- Clear selection when no results are found (#1756) via @skprabhanjan
- Search from the top of the viewport when there is no selection (#1760) via @skprabhanjan

Start moving parts of the codebase to use TypeScript strict null checks (#1699) via @Tyriar
Use yarn integrity checks (#1728) via @Tyriar
Improve reliability/speed of the demo (#1744) via @jerch
Update Azure Data Studio's name in README (#1745) via @Tyriar
Improve API for consumers using TypeScript strict null checks (#1752) via @Tyriar
Run tests & tslint on addons (#1754) via @vladimirZe
Fix typos in source comments (#1759) via @stkvrs
Significantly improve wcwidth performance (#1789) via @jerch
Significantly improve DOM renderer performance, especially in large terminals (#1792) via @Tyriar
Improve contribution documentation (#1791) via @Tyriar
Remove unused function parameters (#1794) via @Tyriar
Refactors towards new code layering structure (#1795, #1799) via @Tyriar
Upgrade to TypeScript 3.1 (#1800) via @Tyriar