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#!/usr/bin/env bash
# claude-code-decompile.sh - Extract and analyze Claude Code CLI source
#
# Extracts the bundled JavaScript from the Claude Code binary or npm package,
# applies basic beautification, and splits into logical modules.
#
# Usage: ./scripts/claude-code-decompile.sh [output-dir]
#
# Output directory defaults to ./claude-code-extracted/
set -euo pipefail
OUTPUT_DIR="${1:-./claude-code-extracted}"
BINARY=""
CLI_JS=""
# Color output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'
log() { echo -e "${GREEN}[+]${NC} $*"; }
warn() { echo -e "${YELLOW}[!]${NC} $*"; }
err() { echo -e "${RED}[-]${NC} $*" >&2; }
# Find the Claude Code source
find_source() {
# Method 1: NPM package (preferred - cleaner JS)
local npm_paths=(
"$(npm root -g 2>/dev/null)/claude-flow/node_modules/@anthropic-ai/claude-code/cli.js"
"$(npm root -g 2>/dev/null)/@anthropic-ai/claude-code/cli.js"
"./node_modules/@anthropic-ai/claude-code/cli.js"
)
for p in "${npm_paths[@]}"; do
if [[ -f "$p" ]]; then
CLI_JS="$p"
log "Found NPM package: $CLI_JS"
return 0
fi
done
# Method 2: Bun SEA binary
local bin_paths=(
"$HOME/.local/bin/claude"
"$HOME/.local/share/claude/versions/"
"/usr/local/bin/claude"
)
for p in "${bin_paths[@]}"; do
if [[ -f "$p" ]]; then
BINARY="$(readlink -f "$p" 2>/dev/null || echo "$p")"
log "Found binary: $BINARY"
return 0
elif [[ -d "$p" ]]; then
BINARY="$(ls -t "$p"* 2>/dev/null | head -1)"
if [[ -n "$BINARY" ]]; then
log "Found binary: $BINARY"
return 0
fi
fi
done
err "Could not find Claude Code binary or npm package"
echo "Install via: npm install -g @anthropic-ai/claude-code"
echo "Or ensure claude is installed: claude --version"
return 1
}
# Extract JS from Bun SEA binary using strings
extract_from_binary() {
local binary="$1"
local output="$2"
log "Extracting strings from binary ($(du -h "$binary" | cut -f1))..."
strings "$binary" > "${output}/raw-strings.txt"
local total_lines
total_lines=$(wc -l < "${output}/raw-strings.txt")
log "Extracted $total_lines string fragments"
# Extract JS-like patterns
log "Filtering JavaScript patterns..."
grep -E '(function\s|class\s|=>\s*\{|export\s|import\s|require\(|async\s|await\s|const\s|let\s|var\s)' \
"${output}/raw-strings.txt" > "${output}/js-fragments.txt" 2>/dev/null || true
local js_lines
js_lines=$(wc -l < "${output}/js-fragments.txt")
log "Found $js_lines JS-like fragments"
}
# Process the cli.js bundle
process_bundle() {
local source="$1"
local output="$2"
log "Processing bundle: $(du -h "$source" | cut -f1)"
# Copy original
cp "$source" "${output}/cli.js.original"
# Basic beautification: add newlines at statement boundaries
log "Beautifying (adding newlines at statement boundaries)..."
sed 's/;/;\n/g' "$source" | \
sed 's/{/{\n/g' | \
sed 's/}/}\n/g' > "${output}/cli.beautified.js"
local beautified_lines
beautified_lines=$(wc -l < "${output}/cli.beautified.js")
log "Beautified: $beautified_lines lines"
# Extract metrics
log "Computing code metrics..."
{
echo "=== Claude Code Source Metrics ==="
echo "Date: $(date -Iseconds)"
echo "Source: $source"
echo "Original size: $(wc -c < "$source") bytes"
echo "Original lines: $(wc -l < "$source")"
echo "Beautified lines: $beautified_lines"
echo ""
echo "--- Counts ---"
echo "Functions: $(grep -oP 'function\s*\w*\s*\(' "$source" | wc -l)"
echo "Async functions: $(grep -oP 'async\s+function' "$source" | wc -l)"
echo "Arrow functions: $(grep -oP '=>' "$source" | wc -l)"
echo "Classes: $(grep -oP 'class \w+' "$source" | wc -l)"
echo "Extends: $(grep -oP 'extends \w+' "$source" | wc -l)"
echo "For-await loops: $(grep -c 'for await' "$source")"
echo "Yield statements: $(grep -c 'yield' "$source")"
echo ""
echo "--- Node.js Imports ---"
grep -oP 'from"[^"]*"' "$source" | sort -u | grep -P 'from"(node:|assert|child_process|crypto|events|fs|http|https|module|net|os|path|process|stream|tty|url|util|zlib)'
echo ""
echo "--- Class Definitions ---"
grep -oP 'class \w+( extends \w+)?' "$source" | sort -u
} > "${output}/metrics.txt"
log "Metrics saved to ${output}/metrics.txt"
}
# Split into logical modules based on patterns
split_modules() {
local source="$1"
local output="$2"
local modules_dir="${output}/modules"
mkdir -p "$modules_dir"
log "Splitting into logical modules..."
# Extract tool-related code
grep -oP '.{0,200}(BashTool|FileReadTool|FileEditTool|FileWriteTool|AgentOutputTool|WebFetch|WebSearch|TodoWrite|NotebookEdit|GlobTool|GrepTool).{0,200}' \
"$source" > "${modules_dir}/tools.txt" 2>/dev/null || true
# Extract permission-related code
grep -oP '.{0,200}(permission|Permission|canUseTool|alwaysAllowRules|denyWrite|sandbox|Sandbox).{0,200}' \
"$source" > "${modules_dir}/permissions.txt" 2>/dev/null || true
# Extract MCP-related code
grep -oP '.{0,200}(mcp__|McpClient|McpServer|McpError|callTool|listTools|initialize).{0,200}' \
"$source" > "${modules_dir}/mcp.txt" 2>/dev/null || true
# Extract streaming-related code
grep -oP '.{0,200}(content_block_delta|message_start|message_stop|message_delta|content_block_start|content_block_stop|stream_event|text_delta|input_json_delta).{0,200}' \
"$source" > "${modules_dir}/streaming.txt" 2>/dev/null || true
# Extract context/compaction code
grep -oP '.{0,200}(compact|compaction|tengu_compact|microcompact|auto_compact|compact_boundary|preCompactTokenCount|postCompactTokenCount).{0,200}' \
"$source" > "${modules_dir}/compaction.txt" 2>/dev/null || true
# Extract agent loop code
grep -oP '.{0,200}(agentLoop|mainLoop|s\$\(|querySource|toolUseContext|systemPrompt).{0,200}' \
"$source" > "${modules_dir}/agent-loop.txt" 2>/dev/null || true
# Extract telemetry events
grep -oP '"tengu_[^"]*"' "$source" | sort -u > "${modules_dir}/telemetry-events.txt" 2>/dev/null || true
# Extract string constants (tool names, commands, etc.)
grep -oP 'name:"[a-z][-a-z]*",description:"[^"]*"' "$source" | sort -u > "${modules_dir}/commands.txt" 2>/dev/null || true
# Extract class hierarchy
grep -oP 'class \w+ extends \w+' "$source" | sort -u > "${modules_dir}/class-hierarchy.txt" 2>/dev/null || true
# Count extracted lines per module
for f in "${modules_dir}"/*.txt; do
local name
name=$(basename "$f" .txt)
local lines
lines=$(wc -l < "$f")
log " Module '$name': $lines fragments"
done
}
# Generate RVF files from extracted modules
generate_rvf() {
local modules_dir="$1/modules"
local rvf_dir="$1/rvf"
mkdir -p "$rvf_dir"
log "Generating RVF files..."
local version
version=$(grep -oP 'VERSION:"[^"]*"' "$modules_dir/../cli.js.original" 2>/dev/null | head -1 | grep -oP '\d+\.\d+\.\d+' || echo "unknown")
for f in "${modules_dir}"/*.txt; do
local name
name=$(basename "$f" .txt)
local rvf_file="${rvf_dir}/${name}.rvf"
{
echo "---"
echo "type: source-extraction"
echo "module: ${name}"
echo "binary: claude-code"
echo "version: ${version}"
echo "extraction-method: strings+pattern-match"
echo "confidence: medium"
echo "fragments: $(wc -l < "$f")"
echo "---"
echo ""
echo "# ${name} - Extracted Fragments"
echo ""
echo '```javascript'
cat "$f"
echo '```'
} > "$rvf_file"
log " Created ${rvf_file}"
done
}
# Main
main() {
log "Claude Code Decompiler"
log "======================"
mkdir -p "$OUTPUT_DIR"
find_source
if [[ -n "$CLI_JS" ]]; then
process_bundle "$CLI_JS" "$OUTPUT_DIR"
split_modules "$CLI_JS" "$OUTPUT_DIR"
generate_rvf "$OUTPUT_DIR"
elif [[ -n "$BINARY" ]]; then
extract_from_binary "$BINARY" "$OUTPUT_DIR"
# If we got enough JS, process it
if [[ -f "${OUTPUT_DIR}/js-fragments.txt" ]]; then
split_modules "${OUTPUT_DIR}/js-fragments.txt" "$OUTPUT_DIR"
generate_rvf "$OUTPUT_DIR"
fi
fi
log ""
log "Extraction complete!"
log "Output directory: $OUTPUT_DIR"
log ""
log "Key files:"
log " metrics.txt - Code metrics and counts"
log " cli.beautified.js - Beautified bundle (if from NPM)"
log " modules/ - Split by logical module"
log " rvf/ - RVF files with metadata headers"
# Summary
if [[ -f "${OUTPUT_DIR}/metrics.txt" ]]; then
echo ""
head -15 "${OUTPUT_DIR}/metrics.txt"
fi
}
main "$@"
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