TypeScript was made open source because JavaScript developers at the time expected all dependencies to be open source, following the precedent set by jQuery, Lodash, and early module systems. This decision proved transformative: close collaboration with popular frameworks like Angular, Vue, and React created rapid feedback cycles that directly improved TypeScript as a language. Being a superset of ECMAScript also allowed TypeScript to benefit from the fast-evolving web standards and framework ecosystem of that era.
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