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Babel cheat sheet & developer notes

Babel cheat sheet and 2 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Babel

Polyfills, TypeScript & the JSX Runtime

Polyfills, TypeScript & the JSX Runtime. Syntax Transforms vs. Polyfills. Syntax transforms rewrite new SYNTAX into equivalent old syntax at compile time (const → var). Polyfills add missing RUNTIME features (Promise, Ar…

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02 · Babel

Presets, Plugins & Config

Presets, Plugins & Config. What Babel Does. Babel is a compiler: it parses source into an AST, applies plugin-defined transforms, then generates new code. It rewrites modern/non-standard syntax (arrow functions, optional…

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Notes from developers

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Apr 2, 2026
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Concepts to know for Babel

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ES Modules vs CommonJS: How JavaScript Modules LoadWhy require runs a file on the spot while import builds the whole graph first, what live bindings and circular imports do, and how Node picks a module system.Intermediate·14 min

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