ShrinkToFit is used at run time in 4 crates (of which 4 optionally). It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps) ShrinkToFit version
900K 190 swc_common optional ^0.2.1
898K 122 swc_atoms optional ^0.2.1
893K 128 swc_ecma_ast optional ^0.2.1