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Combines syntax detection with light data-flow filtering.","url":"https://app.codemod.com/registry/async-waterfall-mining","publisher":{"@id":"https://app.codemod.com#org"},"softwareVersion":"0.1.5","applicationCategory":"DeveloperApplication","operatingSystem":"Cross-platform","offers":{"@type":"Offer","price":"0","priceCurrency":"USD","availability":"https://schema.org/InStock"}}]}49:T1148,# Async Waterfall Mining Read-only JSSG mining codemod that surfaces **async serialization / parallelization opportunities** in TypeScript codebases. Each workflow step emits a separate metric namespace; no source files are modified. Findings are **candidates for review**, not proof that code is safe to parallelize. Use metrics to narrow the search space in Codemod Insights; confirm with profiling and domain analysis before refactoring. ## Metrics | Metric atom | Pattern | |-------------|---------| | `async_waterfall_await_in_loop` | `await` inside `for` / `for...of` / `for await...of` / `while` / `do...while` | | `async_waterfall_consecutive_await` | Adjacent sibling `await` statements (with independence heuristic) | | `async_waterfall_async_reduce` | `.reduce()` with `async` callback or `await` in reducer | | `async_waterfall_sequential_chunk` | `await` inside loops over chunks, batches, or pages | | `async_waterfall_repeated_await_call` | Same awaited call shape repeated 2+ times in one function | Metrics do not include a `severity` or `impact` field. Tier findings in Insights using cardinality (for example `io_likelihood`, `independence`, `inside_loop`). ## Metric cardinality Every finding includes: - `file_path`, `function_name`, `line`, `snippet` Additional dimensions per metric: | Metric | Cardinality | |--------|-------------| | `async_waterfall_await_in_loop` | `loop_kind`, `nesting_depth`, `await_count`, `io_likelihood` | | `async_waterfall_consecutive_await` | `independence`, `first_callee`, `second_callee`, `first_io`, `second_io` | | `async_waterfall_async_reduce` | (location only) | | `async_waterfall_sequential_chunk` | `loop_var`, `iterable_hint`, `io_likelihood` | | `async_waterfall_repeated_await_call` | `callee`, `occurrence_count`, `inside_loop` | `io_likelihood` and `first_io` / `second_io` are heuristic (`high`, `medium`, `low`) based on callee names (for example `fetch`, `query`, `insert`, `checkpoint`). ## Emit conditions - **await-in-loop** — loop body has at least one non-suppressed `await`, and (`io_likelihood` is not `low` or `nesting_depth` is `2+`). Skips loop bodies that are only `await Promise.all(...)`. - **consecutive-await** — two adjacent statements in the same block each have a top-level `await`. Suppresses `likely_dependent` pairs unless `emit_dependent_consecutive` is enabled. - **async-reduce** — any `.reduce()` whose callback is `async` or contains `await` (no I/O gate). - **sequential-chunk** — loop variable or iterable matches chunk/batch/page naming (for example `chunk`, `batch`, `page`, `chunk(...)`, `paginate(...)`), with at least one non-suppressed `await` in the body. - **repeated-await-call** — identical awaited call shape appears 2+ times in one function, and (`inside_loop` is true or occurrences span 2+ lines). **Suppressed awaits** (not counted toward await-in-loop or sequential-chunk): `await` inside `Promise.all` / `allSettled` / `any` / `race` callbacks, or inside `p-limit`-style limiter callbacks. ## Consecutive-await independence For pairs of consecutive `await` statements, the miner checks whether identifiers bound by the first appear in the **call arguments** of the second. This is a shallow, same-block heuristic — not full data-flow or control-flow analysis. - `likely_independent` — no overlap (candidate for `Promise.all`) - `likely_dependent` — second uses first's binding (suppressed by default) - `unknown` — cannot determine from binding walk Enable dependent pairs for tuning: workflow param `emit_dependent_consecutive: true`. ## Semantic analysis Steps **2** (`consecutive-await`) and **5** (`repeated-await-call`) enable workspace semantic analysis (oxc) for richer callee resolution. Run from a TypeScript project root. Steps 1, 3, and 4 use file-scope AST only. ## Workflow params - `include_tests` (default `false`) — include `*.test.*` / `*.spec.*` - `emit_dependent_consecutive` (default `false`) — emit `likely_dependent` consecutive-await pairs ## Limits This tool **reports** suspicious patterns only. It does not: - Prove calls are safe to parallelize (transactions, ordering, rate limits) - Auto-apply `Promise.all` or `p-limit` refactors - Model full TypeScript control-flow or cross-function dependencies All findings require human review before refactoring. 19:[["$","script",null,{"type":"application/ld+json","dangerouslySetInnerHTML":{"__html":"$47"}}],["$","$L48",null,{"state":{"mutations":[],"queries":[{"dehydratedAt":1789944599087,"state":{"data":{"json":{"id":"12d9f94e-5297-4d92-a9c4-4f5830075c08","name":"async-waterfall-mining","displayName":"async-waterfall-mining","description":"Mine TypeScript async serialization / parallelization opportunities via read-only JSSG metrics (await-in-loop, consecutive awaits, async reduce, sequential chunks, repeated await calls). 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