TypeScript 7: 10x Faster Builds, Strictness by Default

TypeScript 7: A Performance Leap

The Microsoft update on TypeScript 7 represents a substantial leap forward for the language, primarily driven by the rewrite of the compiler in Go (tsgo). The promise of a 10x speedup in build times and reduced memory usage is a compelling proposition, particularly for large TypeScript codebases where compilation times can be a significant bottleneck in the development workflow. The shift to strict mode by default is a welcome change, pushing developers towards more robust and type-safe code, which aligns with industry best practices and can help prevent subtle bugs. The adoption of Go for the compiler implementation is an interesting choice, given its performance characteristics and the existing codebase's functional style. However, the article also highlights a critical area of concern: the migration path for tools that rely on the TypeScript compiler API. The lack of clarity around API compatibility and distribution of the native compiler raises valid questions about the ease with which existing tools can adapt to the new architecture. This is a potential hurdle that could impede adoption if not addressed effectively.

Key Points

• TypeScript 7 introduces tsgo, a new compiler written in Go, promising up to 10x faster build times and reduced memory usage.
• Strict mode is now enabled by default, representing a breaking change aimed at improving type safety.
• The choice of Go as the implementation language offers performance benefits and a natural fit for the existing codebase's functional style.
• Concerns exist regarding the migration path for tools that utilize the TypeScript compiler API.

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📖 Source: Microsoft Share Update on TypeScript 7