I’ve worked with relatively large projects in TypeScript, Python, C#, and Swift, and I’ve come to believe the more opinionated the language and framework, the better. C# .NET, despite being a monster, was a breath of fresh air after TS. Each iteration just worked. Each new feature simply gets implemented.
My experience also points to compiled languages that give immediate feedback on build. It’s nearly impossible to stop any AI agent from using 'as any' or 'as unknown as X'casts in TypeScript - LLMs will “fix” problems by sweeping them under the rug. The larger the codebase, the more review and supervision is required. TS codebase rots much faster then rust/C#/swift etc.
You can fix a lot of that with a strict tsconfig, Biome and a handful of claude.md rules, I’ve found. That said, it’s been ages since I wrote a line of C#, but it remains the most productive language I’ve used. My TypeScript productivity has only recently begun to approach it.
My experience also points to compiled languages that give immediate feedback on build. It’s nearly impossible to stop any AI agent from using 'as any' or 'as unknown as X'casts in TypeScript - LLMs will “fix” problems by sweeping them under the rug. The larger the codebase, the more review and supervision is required. TS codebase rots much faster then rust/C#/swift etc.