ts-invariant: TypeScript Assertions

ts-invariant is a TypeScript-first implementation of the widely used `invariant(condition, message)` assertion pattern. It's designed for validating preconditions and ensuring consistent program state, primarily in development builds. The current stable version is 0.10.3. Actively maintained as part of the Apollo GraphQL ecosystem, its release cadence is tied to broader project needs rather than a fixed schedule. Key differentiators include robust TypeScript typing for compile-time safety, extended logging capabilities (`invariant.log`, `invariant.warn`, `invariant.error`), and configurable verbosity via `setVerbosity`. A significant feature is its compatibility with bundler plugins (like `rollup-plugin-invariant`, though that plugin is now archived), which can strip assertion messages from production bundles to reduce file size, making it a performance-conscious choice for assertions.