TypeScript

TypeScript has effectively replaced JavaScript as the language you actually write for production web apps — JavaScript is now the compile target, not the authoring language. The 2025 Stack Overflow survey found TypeScript overtook JavaScript in most loved rankings for the third consecutive year. The data point that matters: 74% of new npm packages published in 2025 include TypeScript type definitions. Learning TypeScript in 2026 means learning the full-stack web: React/Next.js on the front, Node/Deno/Bun on the back, and edge runtimes everywhere. TypeScript developer salaries now trail Python by only $4k median, a gap that has closed by $11k since 2022.