$ show dataform-co/dataform
Dataform is an open-source data transformation and workflow orchestration tool focused on BigQuery. It compiles a custom SQLX language—which embeds JavaScript (JS) within SQL—into executable SQL pipelines. The repository provides a CLI (`dataform compile|run|test`), a core library defining action types (tables, views, incremental tables, assertions, operations, notebooks, property graphs), a just-in-time (JIT) compilation engine, and optional lineage emission to Google Cloud Data Lineage via OpenLineage. The architecture separates the CLI layer, core compilation logic (using protobuf for structured configs), database adapters (primarily BigQuery with Iceberg support), and a custom testing framework. Bazel is used for building and packaging npm distributions (`@dataform/cli`, `@dataform/core`). The codebase is well-structured, extensively tested, and actively maintained, though it carries some technical debt from legacy config formats and a deprecated VSCode extension. Its components are highly cohesive but tightly coupled to BigQuery, making it a specialized rather than general-purpose data tool.
The LLM identified 4 files worth highlighting for reuse:
A robust, well-tested stringifier that serializes arbitrary JavaScript objects to JSON, handling circular references, Maps, Sets, BigInts, regular expressions, and other non-standard types. It is self-contained, depends only on standard Node.js modules, and can be extracted into any TypeScript project needing a lossy but comprehensive object-to-string conversion. The implementation demonstrates careful edge-case handling and clear documentation.
A collection of generic async utility functions including `retry` (with configurable delays and retry on error predicate), `timeout` (with custom timeout error), `sleep`, `allSettled` (an implementation of Promise.allSettled supporting older Node versions), and `waitFor` (poll until condition). Each function is standalone, well-documented, and tested. This module could be dropped into any Node.js project to improve async workflows without modification.
Provides an `ErrorWithCause` class that allows chaining errors while preserving stack traces, and a `flattenError` function to traverse the error chain into a readable string. This is a common requirement for robust production debugging and is implemented cleanly with no external dependencies. The pattern is reusable in any TypeScript application needing improved error propagation.
An OpenLineage event emitter that sends RunEvents to a Google Cloud Data Lineage API endpoint, with support for a regional endpoint provider (REP) and a global fallback. It implements fail-open semantics (errors are logged and a kill-switch disables further emissions) and is configurable via environment variables. While it imports from internal modules (`payload_builder` and `endpoint_router`), those are logically co-located in the same lineage folder and the overall design is a clear, reusable pattern for any project needing to emit standardized lineage events to an OpenLineage-compatible sink.