Add support for serializing trees as JSON

This adds support for serializing the mdast syntax tree as JSON,
with serde, through a feature.

Closes GH-10.
Related-to GH-30.
Closes GH-37.

1 files changed, 6 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index ca71e3f..0e1b7a9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,9 +17,15 @@ name = "bench"
 path = "benches/bench.rs"
 harness = false
 
+[features]
+default = ["json"]
+json = ["dep:serde", "dep:serde_json"]
+
 [dependencies]
 log = "0.4"
 unicode-id = { version = "0.3", features = ["no_std"] }
+serde = { version = "1.0", optional = true }
+serde_json = { version = "1.0", optional = true }
 
 [dev-dependencies]
 env_logger = "0.10"