Cargo Features

wasm-tracing has no features set by default.

[dependencies]
wasm-tracing = { version = "0.2.1", features = ["mark-with-rayon-thread-index", "tracing-log"] }
mark-with-rayon-thread-index = rayon

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.

tracing-log implicit feature

Enables tracing-log

tracing-log:

Provides compatibility between tracing and the log crate

rayon mark-with-rayon-thread-index?