Stop trusting environment variables in your TypeScript apps

Short summary

Environment variables in JavaScript often contain invalid values that pass type checks—Boolean('false') returns true, Number('') returns 0. TypeScript apps can ship with broken configuration because type safety doesn't validate environment values. Implement strict validation schemas at startup or build time to catch configuration errors before deployment.

• •JavaScript's type coercion silently accepts invalid environment values
• •TypeScript builds can pass but fail at runtime due to bad config
• •Use strict validation schemas to catch errors before deployment

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