The Path to Native TypeScript
summary
Node.js implements a type stripping runtime that erases TypeScript-only syntax by replacing it with whitespace so source locations stay unchanged, using a customized SWC WebAssembly build wrapped as Amaro. The staged rollout lands an experimental flag (experimental-strip-types in Node 22.6, enabled by default in 23.6) after a PR that landed in 20 days; it supports most erased syntax fast but rejects enums/namespaces unless experimental-transform-types (with source maps) is enabled and forbids running .ts inside node_modules.
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chapters (8)
- 0:00Introduction to Native TypeScript in Node.js
- 3:56Challenges in Implementing TypeScript in Node.js
- 7:18TypeStripping: Implementing TypeScript in Node.js
- 10:48TypeStripping: How It Works and the Amaro Package
- 13:48Experimental Strip Types and Transform Types
- 15:19TypeScript Limitations and Code Migration
- 18:37TypeScript Import Types and Syntax Detection
- 21:57Ambiguity in Syntax and Future Steps
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