Effect: A Functional Foundation For TypeScript
summary
Effect presents a concrete library stack for TypeScript: runtime schemas with roundtrip serialization and property testing, composable dependency layers and generator-based effects for determinism, automatic native open-telemetry spans across client/server and SQL calls, generated OpenAPI server + type-safe client, structured concurrency and plans for cluster/durable workflows (alpha). Claims include a stable Effect 3.0 release and a minimal client bundle around ~40KB gzipped; demo shows working SQL + traces end-to-end.
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chapters (22)
- 0:00Introduction and talk overview
- 1:09What Effect is and its purpose
- 3:00Effect’s scope and ecosystem
- 6:15Why Effect was created
- 9:07JavaScript’s concurrency model
- 13:08Real problems in TypeScript development
- 17:08Effect solving real-world problems
- 19:38Advantages of using TypeScript
- 22:46Full-stack API demo introduction
- 23:31Building schemas and API specification
- 25:21Dependency injection with layers
- 27:31Service construction and composition
- 29:23Core application and SQL integration
- 31:57Observability and telemetry setup
- 33:05Running the API server
- 34:09Building the type-safe API client
- 35:33Demo results and API documentation
- 36:57OpenTelemetry traces in Honeycomb
- 38:21Demo recap and features
- 39:23Effect 3.0 stable release and funding
- 40:49Future plans and ecosystem growth
- 41:10Closing remarks and Q&A
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