par-iter is used at run time in 54 crates (of which 6 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) par-iter version
203K 62 swc_ecma_utils ^1.0.2
73K 18 swc_ecma_minifier ^1.0.2
19K 22 swc ^1.0.2