Fix serde dependency usage (#141)

Author: mondeja

examples/csr-minimal/Cargo.toml

@@ -9,7 +9,7 @@ path = "src/lib.rs"
 
 [dependencies]
 leptos = { version = "0.6.12", features = ["csr"] }
-leptos-fluent = { path = "../../leptos-fluent" }
+leptos-fluent = { path = "../../leptos-fluent", default-features = false }
 fluent-templates = "0.9"
 console_error_panic_hook = "0.1"
 

leptos-fluent-macros/src/languages.rs

@@ -1,13 +1,15 @@
 use std::fs;
 use std::path::PathBuf;
 
+#[cfg(any(feature = "json", feature = "yaml", feature = "json5"))]
 #[derive(serde::Deserialize)]
 #[serde(untagged)]
 enum LanguagesFileLanguage {
     CodeName(String, String),
     CodeNameDir(String, String, String),
 }
 
+#[cfg(any(feature = "json", feature = "yaml", feature = "json5"))]
 fn set_dir_to_languages_from_languages_file(
     languages: &[LanguagesFileLanguage],
 ) -> Vec<(String, String, String)> {