Does NHS DTAC require TypeScript?

DTAC Domain 3 does not explicitly require TypeScript. But: IEC 62304 Class B requires V&V evidence -- TypeScript provides compile-time V&V that JavaScript cannot. DTAC assessors reviewing IEC 62304 for Class B will note absent type safety. ClickMasters: TypeScript for all NHS clinical software (Class B and C). For Class A: TypeScript still recommended, JavaScript defensible.

Is TypeScript too slow for UK startup MVPs?

TypeScript adds compilation step -- initial setup 1-2 hours. Long-term it saves time because: (1) runtime type errors caught at compile time (a runtime null in an NHS DTAC product is a clinical safety incident -- TypeScript catches it before deployment), (2) refactoring is safer, (3) code review faster. ClickMasters: TypeScript setup cost recovered in 2-3 sprints for NHS and FCA projects.

Typescript Vs Javascript Uk Development 2026

TypeScript vs JavaScript -- UK Development (2026)

Updated: June 20269 min read

UKGBPComparisonUK GDPRUK Law

Direct Answer

TypeScript is the UK standard for all new production projects in 2026 -- NHS DTAC, FCA PS21/3, and GDS compliance benefit from compile-time error catching. New UK projects should default to TypeScript. JavaScript-only remains acceptable for scripts, quick prototypes, and simple tooling only. TypeScript vs JavaScript affects NHS DTAC IEC 62304 traceability, FCA Consumer Duty code quality, and long-term maintainability of UK regulated software.

Factor	TypeScript	JavaScript (plain)
NHS IEC 62304 (medical device)	BEST -- compile-time type checking reduces Class B runtime failures	Runtime errors possible -- harder to evidence type safety
FCA PS21/3 code quality	BEST -- TypeScript errors = CI/CD failures = pre-production detection	Runtime errors may reach production
NHS DTAC Domain 3 security	BEST -- catches undefined property access (common XSS vector)	No compile-time protection against type-related runtime issues
IDE support / productivity	BEST -- autocomplete, refactoring, inline docs across codebase	Basic autocomplete -- no cross-file type inference
NHS FHIR R4 UK Core types	BEST -- @types/fhir + custom UK Core -- FHIR resources fully typed	FHIR resources as any -- no type checking on clinical data
Team onboarding	Steeper learning curve -- worth it for regulated projects	Faster initial -- cheaper short-term
Legacy JavaScript codebase	Gradual migration -- allowJs in tsconfig	Existing state -- no change
ClickMasters default	All new UK projects -- NHS, FCA, GDS, commercial	Legacy codebases only