Stdlib reference

Every entry on this page comes from stdlib.json , a single IonDocManifest document embedded in ion-core at compile time. The Ion language server reads the same manifest for hover and completion, so what you see here is what you'll get in your editor.

Modules

• bytes — Byte construction, encoding, concatenation, and endian packing.
• core — Global builtins available in every Ion program without `use`.
• fs — Filesystem I/O. Sync (`std::fs`) or async (`tokio::fs`) impl picked by the build's runtime feature.
• io — Standard input/output.
• json — JSON encoding and decoding.
• log — Leveled logging — `log::trace` / `debug` / `info` / `warn` / `error`. Compile-time stripped above the cap.
• math — Mathematical constants and functions.
• os — OS / arch detection, environment variables, and process info.
• path — Pure-string path manipulation (no I/O).
• rand — Random values, ranges, and collection sampling.
• semver — Semantic version parsing, comparison, and constraint matching.
• string — String utilities.
• types — Built-in value types and the methods callable on them.