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Superset ↔ extension to set (language extends base Programming Language)

!analogy: if JS was CSS, then TS would be SCSS

previews next-gen JS-features in TC39 Process pipeline

TS ultimately gets Downlevelled to ECMAScript

References​

  1. TS ↔ Superset of JS + Static Type System layer

  2. KaTeX ↔ LaTeX Superset to typeset Math notation for Web Page

  3. Preprocessor ↔ Dev tool to Transpile Code Superset to other (base compatible) Code

  4. Sass ↔ Popular Superset extends CSS via Preprocessor