[stachbial]

Description

• --check reports the sets a build would regenerate and exits with 1 if there are any. It builds, writes and links nothing. It checks the sets the same command would build without it: the icon and symbol sets of .nanoicons.json, or only the dynamic sets with --dynamic or --dynamic-app-config.
• Without --dynamic, a static font set is also out of date when its copy in android/ or ios/ differs from the generated font, e.g. after the Metro plugin rebuilt it without linking.
• A set is out of date for the same reasons a build regenerates it: a missing file, changed SVGs, options or installed versions, a changed linking mode, or web output turned on or off. Each set is named with its reason.
• The build and the check use the same up-to-date test.
• The SVG fingerprint reads CRLF line endings as LF, so a Windows checkout stays up to date. A glyphmap that is not valid JSON, or has no fingerprint or family, is out of date, and the build regenerates it.
• README: the flag in the CLI table and a CI note under "When fonts are regenerated". FONT_INTEGRITY.md: the CLI run.

Test plan

• yarn test (653 tests), ts-check and lint clean. New: each reason for an icon set, the flag with every set source, and a real build of fonts and symbols that stays up to date until an SVG changes, with nothing written, and linked fonts that are missing or differ.
• Bare example: --check names the three font sets whose committed android/ fonts were built from older outputs, and passes after a full CLI run. After editing one of its SVGs it names that set and exits with 1, and the outputs stay byte-identical.
• Expo example: --check --dynamic-app-config reads the app config and checks only the dynamic set.

[github-actions]

Font benchmark: ✅ pass

base b002d89 → pr ba41806. 3 runs per set. Sizes are exact; times come from separate runners.

Details

Fonts

Raw is the .ttf on disk. Compressed is the same file after deflate at level 9, which is roughly what an APK or IPA carries.

Set	Raw	Compressed
MaterialIcons_baseline	307,528 → 307,528 (0.0%)	163,775 → 163,775 (0.0%)
MaterialIcons_outline	338,072 → 338,072 (0.0%)	182,651 → 182,651 (0.0%)
MaterialIcons_round	416,936 → 416,936 (0.0%)	216,846 → 216,846 (0.0%)
MaterialIcons_sharp	273,232 → 273,232 (0.0%)	150,630 → 150,630 (0.0%)
MaterialIcons_twotone	451,268 → 451,268 (0.0%)	236,463 → 236,463 (0.0%)
SWMIcons_outline	107,116 → 107,116 (0.0%)	28,632 → 28,632 (0.0%)
SWMIcons_duotone	115,860 → 115,860 (0.0%)	34,184 → 34,184 (0.0%)
SWMIcons_curved	102,524 → 102,524 (0.0%)	31,597 → 31,597 (0.0%)

Package

	base	pr	Δ
Tarball bytes	135,800	137,233	+1.1%
Files	290	290

Checks

Check	Limit	Result
Raw font growth	≤ 6% per set	✅
Tarball growth	≤ 6%	✅
Byte-identical rebuilds	required	✅ (base: yes)
OpenType Sanitizer	every font accepted	✅

Build time, median of 3 runs (not gated)

Set	base	pr	Δ
MaterialIcons_baseline	3,578 ms	4,866 ms	+36.0%
MaterialIcons_outline	3,825 ms	5,252 ms	+37.3%
MaterialIcons_round	4,742 ms	6,521 ms	+37.5%
MaterialIcons_sharp	3,232 ms	4,606 ms	+42.5%
MaterialIcons_twotone	4,780 ms	6,777 ms	+41.8%
SWMIcons_outline	1,851 ms	2,603 ms	+40.6%
SWMIcons_duotone	1,972 ms	2,811 ms	+42.5%
SWMIcons_curved	1,762 ms	2,496 ms	+41.7%