par-core is used at run time in 57 crates (of which 7 optionally). It is a direct run-time dependency in 15 crates. It's used at build time in 4 crates (of which 3 optionally, ). It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) par-core version
211K 62 swc_ecma_utils ^1.0.3
207K 53 swc_ecma_transforms_base ^1.0.3
114K 3 par-iter ^1.0.0
83K 8 swc_ecma_transforms_optimization ^1.0.3
75K 19 swc_ecma_minifier ^1.0.3
30K 12 swc_ecma_transforms_compat ^1.0.3
26K 14 swc_ecma_transforms ^1.0.3
24K 3 swc_ecma_lints ^1.0.3
22K 22 swc ^1.0.3
39K 87 swc_core optional ^1.0.3
750 swc_cli ^1.0.0
750 1 swc_cli_impl ^1.0.3
370 dbg-swc ^1.0.3
52K 11 swc_bundler dev ^1.0.3
1.0K 12 swc_ecmascript dev ^1.0.3