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‎.agents/skills/ab-testing-implementation/SKILL.md‎

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---
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name: ab-testing-implementation
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description: Implement and review MetaMask Mobile A/B tests using the canonical repository standard. Use for any task that adds or modifies A/B test flags, variant configs, useABTest usage, analytics payloads, or A/B-test-related tests and docs.
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---
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# A/B Testing Implementation
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`docs/ab-testing.md` is the single source of truth.
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Follow `docs/ab-testing.md` section `Agent Execution Standard (SSOT)` for:
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- workflow
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- analytics rules
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- risk-based testing policy
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- required response sections
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- compliance command
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Run and report:
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```bash
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bash .agents/skills/ab-testing-implementation/scripts/check-ab-testing-compliance.sh --staged
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```

‎.agents/skills/ab-testing-implementation/agents/openai.yaml‎

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interface:
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display_name: "A/B Test Implementation"
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short_description: "Implement and validate MetaMask A/B tests."
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default_prompt: "Use $ab-testing-implementation to implement or review an A/B test with our canonical useABTest and active_ab_tests standards."

‎.agents/skills/ab-testing-implementation/scripts/check-ab-testing-compliance.sh‎

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#!/usr/bin/env bash
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set -euo pipefail
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usage() {
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cat <<'USAGE'
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Usage:
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check-ab-testing-compliance.sh --staged
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check-ab-testing-compliance.sh --files <file1,file2,...> [--base <git-ref>]
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Checks changed files for A/B testing implementation compliance.
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Rules:
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- Fail: New ab_tests payload additions in checked code diffs
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- Fail: Malformed literal active_ab_tests objects missing key/value
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- Fail: Inline useABTest variants object missing control
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- Warn: Flag key naming mismatch for Abtest keys
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- Warn: Risky A/B integration changes without test-file updates
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USAGE
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}
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MODE=""
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FILES_ARG=""
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BASE_REF=""
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FALLBACK_TO_WORKTREE=0
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FALLBACK_NOTE=""
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set_mode() {
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local new_mode="$1"
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if [[ -n "$MODE" ]]; then
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echo "ERROR: Choose exactly one mode: --staged or --files."
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usage
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exit 2
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fi
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MODE="$new_mode"
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}
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--staged)
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set_mode "staged"
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shift
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;;
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--files)
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set_mode "files"
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FILES_ARG="${2:-}"
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if [[ -z "$FILES_ARG" ]]; then
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echo "ERROR: --files requires a comma-separated value."
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exit 2
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fi
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shift 2
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;;
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--base)
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BASE_REF="${2:-}"
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if [[ -z "$BASE_REF" ]]; then
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echo "ERROR: --base requires a git ref (for example origin/main)."
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exit 2
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fi
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shift 2
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;;
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-h|--help)
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usage
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exit 0
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;;
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*)
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echo "ERROR: Unknown argument: $1"
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usage
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exit 2
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;;
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esac
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done
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if [[ -z "$MODE" ]]; then
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echo "ERROR: Choose exactly one mode: --staged or --files."
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usage
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exit 2
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fi
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resolve_default_base_ref() {
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if [[ "$MODE" != "files" || -n "$BASE_REF" ]]; then
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return
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fi
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local candidate
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for candidate in "origin/main" "main" "HEAD~1"; do
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if git rev-parse --verify "$candidate" >/dev/null 2>&1; then
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BASE_REF="$candidate"
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return
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fi
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done
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}
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trim() {
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local value="$1"
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value="${value#"${value%%[![:space:]]*}"}"
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value="${value%"${value##*[![:space:]]}"}"
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printf '%s' "$value"
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}
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is_code_file() {
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local file="$1"
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[[ "$file" =~ \.(ts|tsx|js|jsx)$ ]]
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}
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is_test_file() {
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local file="$1"
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[[ "$file" =~ \.test\.(ts|tsx|js|jsx)$ ]] || [[ "$file" =~ /__tests__/ ]]
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}
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is_valid_flag_key() {
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local key="$1"
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[[ "$key" =~ ^[a-z][A-Za-z0-9]*[A-Z]{2,}[0-9]+Abtest[A-Z][A-Za-z0-9]*$ ]]
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}
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collect_staged_files() {
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git diff --cached --name-only --diff-filter=ACMR | awk 'NF && !seen[$0]++'
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}
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collect_worktree_files() {
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{
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git diff --name-only --diff-filter=ACMR
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git ls-files --others --exclude-standard
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} | awk 'NF && !seen[$0]++'
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}
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collect_explicit_files() {
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local raw
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local item
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IFS=',' read -r -a raw <<< "$FILES_ARG"
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for item in "${raw[@]}"; do
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item="$(trim "$item")"
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[[ -n "$item" ]] && printf '%s\n' "$item"
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done | awk 'NF && !seen[$0]++'
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}
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extract_added_lines_from_diff() {
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awk '
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/^\+\+\+ / { next }
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/^\+/ { sub(/^\+/, ""); print }
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' || true
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}
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get_added_lines() {
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local file="$1"
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local base_ref="${2:-}"
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if [[ "$MODE" == "staged" ]]; then
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if [[ "$FALLBACK_TO_WORKTREE" -eq 1 ]]; then
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if [[ -f "$file" ]] && ! git ls-files --error-unmatch "$file" >/dev/null 2>&1; then
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cat "$file"
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return
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fi
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git diff --unified=0 -- "$file" | extract_added_lines_from_diff
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return
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fi
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git diff --cached --unified=0 -- "$file" | extract_added_lines_from_diff
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return
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fi
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if [[ -f "$file" ]] && ! git cat-file -e "HEAD:$file" >/dev/null 2>&1; then
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cat "$file"
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return
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fi
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if [[ -n "$base_ref" ]] && git rev-parse --verify "$base_ref" >/dev/null 2>&1; then
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git diff --unified=0 "$base_ref"...HEAD -- "$file" | extract_added_lines_from_diff
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return
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fi
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if git ls-files --error-unmatch "$file" >/dev/null 2>&1; then
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git diff --unified=0 HEAD -- "$file" | extract_added_lines_from_diff
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fi
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}
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FAILURES=()
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WARNINGS=()
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AB_RISKY_CHANGE_FILES=()
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TEST_CHANGED=0
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CHANGED_FILES=()
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if [[ "$MODE" == "staged" ]]; then
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while IFS= read -r file; do
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[[ -n "$file" ]] && CHANGED_FILES+=("$file")
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done < <(collect_staged_files)
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if [[ ${#CHANGED_FILES[@]} -eq 0 ]]; then
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FALLBACK_TO_WORKTREE=1
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FALLBACK_NOTE="Info: no staged files found; falling back to working-tree changed files."
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while IFS= read -r file; do
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[[ -n "$file" ]] && CHANGED_FILES+=("$file")
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done < <(collect_worktree_files)
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fi
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else
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while IFS= read -r file; do
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[[ -n "$file" ]] && CHANGED_FILES+=("$file")
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done < <(collect_explicit_files)
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fi
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resolve_default_base_ref
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if [[ ${#CHANGED_FILES[@]} -eq 0 || ( ${#CHANGED_FILES[@]} -eq 1 && -z "${CHANGED_FILES[0]}" ) ]]; then
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if [[ "$MODE" == "staged" ]]; then
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echo "A/B compliance check: no staged files and no working-tree changed files to inspect."
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else
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echo "A/B compliance check: no files to inspect from --files input."
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fi
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exit 0
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fi
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for file in "${CHANGED_FILES[@]}"; do
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[[ -z "$file" ]] && continue
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if is_test_file "$file"; then
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TEST_CHANGED=1
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fi
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if ! is_code_file "$file"; then
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continue
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fi
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added="$(get_added_lines "$file" "$BASE_REF")"
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[[ -z "$added" ]] && continue
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if grep -Eq 'useABTest\(|active_ab_tests[[:space:]]*:|ab_tests[[:space:]]*:|trackEvent\(|createEventBuilder\(|MetaMetricsEvents\.|EXPERIMENT_VIEWED|Experiment Viewed' <<< "$added"; then
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AB_RISKY_CHANGE_FILES+=("$file")
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fi
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# Rule: strict ban on new ab_tests payload additions.
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while IFS= read -r line; do
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if [[ "$line" =~ active_ab_tests[[:space:]]*: ]]; then
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continue
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fi
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if [[ "$line" =~ (^|[^A-Za-z0-9_])ab_tests[[:space:]]*: ]] && [[ ! "$line" =~ LEGACY_AB_TEST_ALLOWED ]]; then
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FAILURES+=("$file: added 'ab_tests' payload. New ab_tests payloads are forbidden.")
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fi
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done <<< "$added"
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added_lines=()
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while IFS= read -r added_line; do
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added_lines+=("$added_line")
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done <<< "$added"
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line_count="${#added_lines[@]}"
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for ((i=0; i<line_count; i++)); do
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line="${added_lines[$i]}"
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# Rule: validate literal active_ab_tests payloads include both key and value.
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if [[ "$line" =~ active_ab_tests[[:space:]]*: ]]; then
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if [[ "$line" =~ active_ab_tests[[:space:]]*:[[:space:]]*(\[|\{) ]]; then
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window="$line"
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for ((j=i+1; j<line_count && j<=i+8; j++)); do
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window+=$'\n'"${added_lines[$j]}"
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done
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if ! grep -Eq 'key[[:space:]]*:' <<< "$window" || ! grep -Eq 'value[[:space:]]*:' <<< "$window"; then
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FAILURES+=("$file: malformed literal active_ab_tests object (expected key and value).")
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fi
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fi
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fi
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# Rule: inline useABTest variants object must include control.
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if [[ "$line" =~ useABTest[[:space:]]*\( ]]; then
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call_window=""
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paren_depth=0
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for ((j=i; j<line_count; j++)); do
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segment="${added_lines[$j]}"
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if (( j == i )); then
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segment="useABTest${segment#*useABTest}"
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fi
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call_window+="${call_window:+$'\n'}${segment}"
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open_count="$(printf '%s' "$segment" | tr -cd '(' | wc -c | tr -d ' ')"
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close_count="$(printf '%s' "$segment" | tr -cd ')' | wc -c | tr -d ' ')"
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paren_depth=$((paren_depth + open_count - close_count))
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if (( paren_depth <= 0 )); then
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break
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fi
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done
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normalized_call="$(printf '%s' "$call_window" | tr '\n' ' ')"
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if grep -Eq 'useABTest[[:space:]]*\([^,]+,[[:space:]]*\{' <<< "$normalized_call"; then
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if ! grep -Eq 'control[[:space:]]*:' <<< "$call_window"; then
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FAILURES+=("$file: inline useABTest variants object is missing control.")
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fi
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fi
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fi
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# Rule: warn on useABTest literal flag keys that do not follow naming convention.
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use_abtest_literal_key="$(sed -nE "s/.*useABTest[[:space:]]*\\([[:space:]]*['\"]([^'\"]+)['\"].*/\\1/p" <<< "$line")"
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if [[ -n "$use_abtest_literal_key" ]]; then
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if ! is_valid_flag_key "$use_abtest_literal_key"; then
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WARNINGS+=("$file: flag key '$use_abtest_literal_key' does not match {team}{TICKET}Abtest{Name}.")
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fi
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fi
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# Rule: warn for explicit Abtest keys that do not match naming convention.
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while IFS= read -r quoted; do
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[[ -z "$quoted" ]] && continue
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key="${quoted:1:${#quoted}-2}"
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if [[ -n "$use_abtest_literal_key" && "$key" == "$use_abtest_literal_key" ]]; then
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continue
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fi
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if ! is_valid_flag_key "$key"; then
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WARNINGS+=("$file: Abtest key '$key' does not match {team}{TICKET}Abtest{Name}.")
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fi
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done < <(grep -oE "['\"][^'\"]*Abtest[^'\"]*['\"]" <<< "$line" || true)
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done
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done
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if [[ ${#AB_RISKY_CHANGE_FILES[@]} -gt 0 && "$TEST_CHANGED" -eq 0 ]]; then
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WARNINGS+=("Risky A/B integration changes were detected without any test-file updates. For copy/config-only changes, document rationale in your response.")
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fi
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echo "A/B compliance check summary"
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echo "Mode: $MODE"
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if [[ -n "$FALLBACK_NOTE" ]]; then
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echo "$FALLBACK_NOTE"
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fi
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if [[ "$MODE" == "files" && -n "$BASE_REF" ]]; then
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echo "Base ref: $BASE_REF"
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fi
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echo "Files inspected: ${#CHANGED_FILES[@]}"
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if [[ ${#FAILURES[@]} -gt 0 ]]; then
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echo ""
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echo "Failures:"
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printf '%s\n' "${FAILURES[@]}" | awk '!seen[$0]++' | sed 's/^/- /'
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fi
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if [[ ${#WARNINGS[@]} -gt 0 ]]; then
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echo ""
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echo "Warnings:"
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printf '%s\n' "${WARNINGS[@]}" | awk '!seen[$0]++' | sed 's/^/- /'
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fi
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if [[ ${#FAILURES[@]} -gt 0 ]]; then
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exit 1
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fi
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exit 0

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