What's Changed

Fix for JSONL streaming output to emit initial state before execution begins.

Bug Fixes

• Emit JSONL initial state before execution for streaming UI compatibility

Full Changelog: 1.0.1...1.0.2

What's Changed

Added JSON output support for the --version flag.

Features

• Add JSON output support for --version flag

Other Changes

• Add Vixen to related implementations table

Full Changelog: 1.0.0...1.0.1

What's Changed

This release marks the 1.0.0 milestone for Prancer, featuring CLI improvements with new output formats, enhanced environment inspection, and improved documentation.

Features

• Add JSON and JSONL output formats for machine-readable CLI output
• Improve env() to show all scoped variables and update CLI branding
• Add version-resolver for PR-based version bumps

Other Changes

• Rename repository references to santa-lang-prancer
• Remove evaluate builtin
• Align exit codes and help text with specification
• Use type aliases instead of interfaces for object types
• Add comprehensive architecture documentation and update README
• Add AGENTS.md for AI coding agent guidance
• Standardize GitHub workflow configuration
• Add MIT license

Full Changelog: 0.1.7...1.0.0

What's Changed

Adds string and sequence operations, fixes arity-aware map/filter, all? for strings, and infinite sequence handling.

Features

• Add reverse(), multiply(), and cycle() methods to strings
• Add cycle() method to Range and Sequence classes

Bug Fixes

• Make map/filter arity-aware and fix all? for strings
• Fix Sequence.fold() to handle infinite sequences with manual iteration
• Fix zip() spread bug by converting Immutable.Seq to array before spreading

Other Changes

• Add test coverage for arity-aware map/filter and cycle operations

Full Changelog: 0.1.6...0.1.7

What's Changed

This release adds grapheme cluster indexing for strings and aligns the implementation with the language specification.

Features

• Implement grapheme cluster indexing for strings

Bug Fixes

• Add missing md5 and signum functions and fix int() rounding behavior
• Align with spec: remove and/or builtins, fix type names, fix dictionary includes?

Full Changelog: 0.1.5...0.1.6

Minor Enhancement: Version Flag

Adds -v/--version flag to the CLI with dynamic release versioning.

Usage

santa --version
santa -v

Breaking Change: Remove else if Syntax

This release removes support for the else if syntax. Use match expressions for multi-way conditionals instead.

Migration

// Before (no longer supported)
if score >= 90 { "A" }
else if score >= 80 { "B" }
else { "C" }

// After (use match)
match score {
  90.. => "A",
  80..90 => "B",
  _ => "C"
}

Why?

• match is more declarative and expresses intent clearly
• Pattern matching with destructuring is built-in
• Exhaustiveness is clearer
• Aligns with functional programming idioms

Introducing Prancer

This release officially introduces Prancer as the codename for the TypeScript tree-walking interpreter implementation of santa-lang.

Standardized Release Artifacts

All release artifacts have been renamed to follow a consistent naming convention:

Docker Images

• ghcr.io/eddmann/santa-lang-prancer:cli-{version}
• ghcr.io/eddmann/santa-lang-prancer:cli-latest

About Prancer

Prancer is the original santa-lang implementation, featuring:

• Tree-walking interpreter in TypeScript
• CLI for running solutions
• Web runtime (JavaScript)
• AWS Lambda runtime

Try it online: eddmann.com/santa-lang-ts

What's Changed

New env() Builtin Function

Added env() for REPL introspection - displays all variables defined in the current session.

let x = 42;
let add = |a, b| a + b;
env();
// Environment:
//   x = 42
//   add = Function

New bit_not Bitwise Function

Added bitwise NOT (complement) operation.

bit_not(0);   // -1
bit_not(5);   // -6

String Comparison Operators

Strings now support <= and >= comparison operators for lexicographic ordering.

"a" <= "b";  // true
"b" >= "a";  // true

Fold Over Infinite Ranges

Infinite ranges can now be folded using break to terminate.

fold(0, |acc, v| if v > 5 { break acc } else { acc + v }, 1..);  // 15

Bug Fixes

• Fixed short-circuit evaluation for && and || operators
• Fixed match expression case scoping to prevent variable leakage
• Fixed parser consuming trailing semicolons after match expressions

What's Changed

Enhanced List Pattern Matching

Rest patterns (..name) can now appear at any position in list patterns, not just the end.

New patterns supported:

• Prefix patterns: [..init, last] - capture all but the last element
• Middle patterns: [first, ..middle, last] - capture elements between first and last

Examples:

let [..init, last] = [1, 2, 3, 4];
// init = [1, 2, 3], last = 4

let [first, ..middle, last] = [1, 2, 3, 4, 5];
// first = 1, middle = [2, 3, 4], last = 5

This enhancement enables more expressive pattern matching, particularly useful for AoC puzzles requiring list manipulation from both ends.