Iosevka [ˌjɔˈseβ.kʰa] is an open-source, sans-serif + slab-serif, monospace + quasi‑proportional typeface family, designed for writing code, using in terminals, and preparing technical documents.
Iosevka支持多种风格设置，并且很方便进行自定义构建。这里介绍下如何继承JetBrains Mono字体风格，并修改字宽、连字符、个别字符风格。
首先需要安装nodejs(≥18.0.0)和ttfautohint。下载Iosevka仓库后，安装相关包文件。
git clone --depth=1 https://github.com/be5invis/Iosevka.git
cd Iosevka
npm install
可以在Iosevka Customizer进行自定义风格设置，生成的配置文件保存在 private-build-plans.toml 中。
[buildPlans.IosevkaSS14]
family = "Iosevka SS14"
spacing = "normal"
serifs = "sans"
noCvSs = true
exportGlyphNames = false
noLigation = true
[buildPlans.IosevkaSS14.variants]
inherits = "ss14"
[buildPlans.IosevkaSS14.variants.design]
cv04 = 5 # 4 semi-open-serifless
cv05 = 5 # 5 oblique-arched-serifless
cv07 = 1 # 7 straight-serifless
cv08 = 1 # 8 crossing
cv10 = 4 # 0 tall-slashed
cv17 = 2 # G toothed-serifless-hooked
cv20 = 2 # J serifed
cv21 = 1 # K straight-serifless
cv26 = 4 # Q crossing
cv32 = 1 # W straight-serifless
cv36 = 1 # a double-storey-serifless
cv46 = 1 # k straight-serifless
cv55 = 1 # u toothed-serifless
cv57 = 1 # w straight-serifless
cv59 = 4 # y straight-turn-serifless
VSAG = 1 # ( normal
VSAJ = 1 # # upright
VSAQ = 1 # ? smooth
[buildPlans.IosevkaSS14.widths.Normal]
shape = 600
menu = 5
css = "normal"
执行 npm run build -- contents::IosevkaSS14 构建TTF和Web Font。
执行 npm run build -- ttf::IosevkaSS14 只构建TTF。默认情况下，构建会根据系统的CPU线程数启动多个并发任务，可能会导致CPU被全部占用，或者是内存不足导致OOM，通过执行 npm run build -- --jCmd=2 ttf::IosevkaSS14 来指定并发任务数目。
构建完成后，字体文件保存在 dist 目录下。