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Transpiler

Source-to-Source Compiler

Definition

A transpiler converts source code from one language or syntax version to another — for example, TypeScript to JavaScript or modern ESNext to ES5 for older browsers. Babel pioneered JavaScript transpilation; esbuild and SWC are faster modern alternatives.

TypeScript's tsc is the canonical TypeScript transpiler. Transpilation enables developers to use modern language features while targeting broader runtime compatibility.

Related Terms

Bundler
JavaScript Bundler
AST
Abstract Syntax Tree
IDE
Integrated Development Environment
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