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Live Coding: Eliminating Redundant Runtime Checks with Config as Code&Type in TypeScript

watch on portal.gitnation.org ↗https://portal.gitnation.org/contents/live-coding-eliminating-redundant-runtime-checks-with-config-as-codeandtype-in-typescript
Talkat JSNation 2025 · 2025-06-12..06-16· [typescript, developer-experience]

speaker

name:Jannik Sommerfeld
website:https://www.janniksommerfeld.de

resources

video:https://portal.gitnation.org/contents/live-coding-eliminating-redundant-runtime-checks-with-config-as-codeandtype-in-typescript
slides:none on file

summary

Shows how to treat runtime configuration as typed code in TypeScript to move validation to build time: uses an Express example that fetches products per market, defines a repository-style config of markets, sellers and locales, derives TypeScript types from that config, and uses those types to validate market keys, seller locales and product routing so many redundant runtime checks can be removed and branches get early feedback during development and testing.

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