Distillation

Date: Sep 8, 2026

• 🔴 [requested-read-only-research] (13:30) User directed read-only research only: inspect /home/byk/Code/getsentry/cli for directory-walking and workspace-discovery implementation potentially reusable by Craft PR #872; do not modify either repository.
• 🟡 (13:30) User requested identification with file:line citations of exact modules, algorithms/contracts (globs, ignores, symlink handling, path normalization, validation), dependencies, public APIs, and test coverage; requested a concise recommendation of directly reuse/extract/adapt versus retain Craft’s implementation, including compatibility/security risks. User said to compare with Craft’s current workspace resolver only if necessary.
• 🔴 (13:31) User stated the inspected /home/byk/Code/getsentry/cli repository root contains 30 entries, including .craft.yml, .env.local, .git/, .github/, .gitignore, .lore.md, AGENTS.md, apps/, packages/, package.json, pnpm-lock.yaml, pnpm-workspace.yaml, README.md, and test/.
• 🔴 (13:31) User stated AGENTS.md:18-19 defines pipeline triage → explore → plan → implement → review → ship; worker is a deprecated alias of implement.
• 🔴 (13:31) User stated AGENTS.md:25-29 says long-term knowledge lives in .lore.md; target repositories require reading AGENTS.md / CONTRIBUTING.md first; skills are generated from canonical skills/ into .agents/skills/ via scripts/sync-skills.mjs.
• 🔴 (13:31) User directive: Always load repo-setup before situation skills.
• 🔴 (13:31) User stated walker ignore behavior means ignored directories such as node_modules are never opened.
• 🔴 (13:31) User stated that when followSymlinks is false (the default), the walker never re-enters a directory.
• 🔴 (13:31) User stated parallel-walker coordination must always wake the consumer so it can detect “all workers done” and terminate.
• 🔴 (13:31) User stated an uncaught pre-fired abort can cause the consumer to hang because it never sees a producer error and worker counters are not decremented.
• 🔴 (13:31) User supplied relevant source/test paths: packages/cli/src/lib/walk-up.ts, packages/cli/src/lib/scan/glob.ts, packages/cli/src/lib/scan/walker.ts, packages/cli/src/lib/scan/ignore.ts, packages/cli/src/lib/init/tools/glob.ts, packages/cli/test/lib/scan/walker.test.ts, packages/cli/test/lib/scan/walker.property.test.ts, packages/cli/test/lib/scan/ignore.test.ts, packages/cli/test/lib/scan/ignore.property.test.ts, and packages/cli/test/lib/scan/glob.test.ts.
• 🟡 (13:31) Source artifact packages/cli/src/lib/scan/walker.ts:1-40 documents public API walkFiles(opts): AsyncIterable<WalkEntry>: recursively yields one entry per regular file under absolute opts.cwd; traverses but never yields directories; skips symlinks unless followSymlinks: true; emits POSIX-normalized paths; supports AbortSignal, throwing DOMException("Walk aborted", "AbortError") on the next advance after abort.
• 🟡 (13:31) Source artifact walker.ts:11-22 contract: DFS traversal, lexicographically sorted entries per directory for deterministic filesystem-independent yield order; every directory at depth ≤ minDepth is explored regardless of elapsed time; beyond minDepth, new descents require clock() - startedAt ≤ timeBudgetMs; already queued directories drain after budget exhaustion.
• 🟡 (13:31) Source artifact walker.ts:24-33, 169-182, 670-687: ignore matcher is checked before directory descent and file yield; nested .gitignore is lazily loaded only after readdir finds a regular .gitignore dentry, avoiding failed reads in directories without one.
• 🟡 (13:31) Source artifact walker.ts:225-283: walkFilesImpl normalizes options, builds an IgnoreStack, initializes telemetry (filesYielded, dirsVisited, filesSkippedBySize, filesSkippedByBinary, hitTimeBudget, maxDepthReached), optionally seeds root inode for symlink-cycle detection, and dispatches to walkSerial for concurrency <= 1 or walkParallel otherwise.
• 🟡 (13:31) Source artifact walker.ts:286-328: walkSerial is the early-exit fast path: LIFO stack DFS, direct yield, sync readdirSync at concurrency === 1, nested ignore loading and onDirectoryVisit before entry processing.
• 🟡 (13:31) Source artifact walker.ts:330-538: walkParallel uses cfg.concurrency workers pulling a shared LIFO DFS stack; a producer-consumer pending: WalkEntry[] channel emits completion-order results, and a separate worker wake channel parks idle workers. signalWorkers() swaps in a fresh unresolved Promise before resolving the old Promise to prevent late awaiters from observing stale resolution. Consumer checks pending results, producerError, and stack.length === 0 && activeWorkers === 0; cleanup sets cancelled, signals workers/consumer, and awaits Promise.all(workers).
• 🟡 (13:31) Source artifact walker.ts:407-421: parallel descent uses ctx.pushFrame rather than monkey-patching Array.prototype.push; parallel implementation sets pushFrame to stack.push(frame); signalWorkers();.
• 🟡 (13:31) Source artifact walker.ts:430-507: worker lifecycle handles abort and unexpected errors by setting producerError, cancelled = true, signaling workers and consumer; allWorkersDone = Promise.all(workers).finally(() => wakeConsumer()) guarantees consumer notification even if workers fail before their normal finally.
• 🟡 (13:31) Source artifact walker.ts:548-629: processEntry skips dotfiles when hidden: false; skips symlinks unless enabled; creates abs by native-separator concatenation and derives rel by slicing cached cwd prefix, converting \ to / on Windows; follows enabled symlinks with stat; skips ignored files; applies lowercase extension allowlist; then emits through tryYieldFile.
• 🟡 (13:31) Source artifact walker.ts:631-673: maybeDescend computes child depth through optional descentHook(relPath, currentDepth), enforces maxDepth, ignores, and time budget; enabled symlink traversal deduplicates target directories by stat-derived ${dev}:${ino} inode keys; allowed children are queued through ctx.pushFrame.
• 🟡 (13:31) Source artifact walker.ts:697-800: tryYieldFile uses statSync for size and mtime, skips files over maxFileSize, optionally floors mtimeMs, and classifies binary files. classifyFile bypasses sniffing when classifyBinary: false, an extension allowlist is supplied, a known TEXT_EXTENSIONS result exists, or file is empty; otherwise calls readHeadAndSniff (8 KB NUL sniff). Read/classification failures are routed through handleFileError; unreadable files fail closed as binary.
• 🟡 (13:31) Source artifact walker.ts:814-913: listDirEntries sorts dentry names; uses readdirSync(dir, { withFileTypes: true }) for concurrency 1 and async readdir otherwise; filesystem errors go to handleFileError and return []. notifyDirectoryVisit passes Math.floor(stat.mtimeMs) and swallows errors. statSymlinkTarget follows symlinks and skips broken/error targets. checkAborted throws DOMException("Walk aborted", "AbortError").
• 🟡 (13:31) Source artifact walker.ts:915-1004: validation requires absolute opts.cwd, otherwise throws Error(\walkFiles: cwd must be absolute, got ${opts.cwd}`); defaults include hidden: true, respectGitignore: true, nestedGitignore: true, maxDepth: Infinity, followSymlinks: false, timeBudgetMs: Infinity, recordMtimes: false, classifyBinary: true. bulkConcurrency()returnsMath.max(2, availableParallelism()); normalizeConcurrency()treats undefined, non-finite, and<1values as default, otherwise floors to integer≥1. Matcher construction calls IgnoreStack.create()withincludeGitInfoExclude: cfg.respectGitignore`.
• 🟡 (13:32) Source artifact packages/cli/src/lib/scan/ignore.ts:1-42: IgnoreStack uses dependency ignore to aggregate root and nested .gitignore semantics; parent rules apply cumulatively and child negations can override parent matches. It also supports a built-in alwaysSkipDirs basename list and optional ${cwd}/.git/info/exclude, matching ripgrep behavior.
• 🟡 (13:32) Source artifact ignore.ts:50-130: public IgnoreStackOptions are cwd, required alwaysSkipDirs, optional respectGitignore, and optional includeGitInfoExclude; public async factory IgnoreStack.create(opts) seeds bare alwaysSkipDirs patterns even when gitignore support is disabled, then loads root .gitignore and optionally .git/info/exclude.
• 🟡 (13:32) Source artifact ignore.ts:132-172: public IgnoreStack.loadFromDir(absDir) is a no-op when gitignore respect is disabled or path is root; reads ${absDir}/.gitignore, ignores missing/empty files, creates a scoped ignore() matcher, accepts only directories validated as descendants of cwd, and replaces prior matcher for the same relative directory. Errors route through handleFileError.
• 🟡 (13:32) Source artifact ignore.ts:174-244: public IgnoreStack.isIgnored(relPath, isDirectory) rejects absolute paths with Error(\IgnoreStack.isIgnored requires a relative path, got: ${relPath}`); root/.return false; directories append/; fast path queries root matcher when no nested ignores exist. Otherwise it applies root-to-leaf loaded ancestor matchers using re-anchored suffixes; child unignored` negations set result false and child ignored matches set it true.
• 🟡 (13:32) Source artifact ignore.ts:246-282: #relDirFor(absDir) validates containment using cwd prefix and separator boundary, then normalizes Windows separators to POSIX /; appendGitignoreFile() reads gitignore-like files into existing matchers, swallows expected ENOENT, and sends other errors to handleFileError.