Cargo Features

swc_ecma_utils has no features set by default.

swc_ecma_utils = { version = "0.131.0", features = ["concurrent", "stacker"] }
concurrent = rayon

Process in parallel.

Enables concurrent of swc_common

Affects parallel::Items

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

rayon concurrent?
stacker not wasm32 arm implicit feature

Affects stack_size::maybe_grow