Cargo Features

[dependencies]
sp-externalities = { version = "0.29.0", default-features = false, features = ["std"] }
default = std

The std feature is set by default whenever sp-externalities is added without default-features = false somewhere in the dependency tree.

std default

Enables std of parity-scale-codec, environmental, and sp-storage

sp-externalities has 2 features without comments.