SYSTEM Cited by 1 source

esbuild

esbuild is an extremely fast JavaScript/TS bundler written in Go by Evan Wallace (former Figma CTO, also author of systems/skew). Benchmark-competitive with earlier bundlers by 10–100×. Emits .map files automatically (the ts-to-js.map side of a composed source-map pipeline in transpiler-driven migrations).

Two features referenced in the wiki's migration literature:

• defines: compile-time constant substitution that, paired with dead code elimination, approximates language-level conditional compilation at the bundler tier. Used by Figma as the TS-era replacement for Skew's if BUILD == "TEST" top-level conditional — branches with a define-matched predicate are stripped post-type-check.
• Source-map emission: transpiler pipelines use it as the outer map in concepts/source-map-composition.

Evan Wallace cites his Skew experience as a design influence on esbuild.

Seen in

• sources/2024-05-03-figma-typescript-migration — bundler underneath Figma's post-migration TS build; defines + dead code elimination cited as the conditional-compilation replacement.