It's used at build time in 19 crates (of which 1 optionally, 7 directly). It's used only as a dev dependency in 13 crates.

Depender (with downloads and own rev deps) esp-build version
22K 22 esp-println build ^0.1.0
21K 20 esp-backtrace build ^0.1.0
19K 13 esp-hal build ^0.1.0
3.7K 1 esp-wifi build ^0.1.0
2.5K 2 esp-hal-embassy build ^0.1.0
460 esp-storage build ^0.1.0
esp-lp-hal build ^0.1.0