par-iter is used at run time in 49 crates (of which 4 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
168K 61 swc_ecma_utils ^1.0.2
70K 18 swc_ecma_minifier ^1.0.2
14K 22 swc ^1.0.2