RuntimeLib.lua and Promise.lua are copied byte-for-byte from reference/roblox-ts/include/ (roblox-ts 3.0.0). Per the rotor design doc (docs/superpowers/specs/2026-06-05-rotor-design.md), they are reused verbatim — never modified. Do not edit these files; to update them, re-copy from the reference checkout.

These are the files rotor build writes into a project's include folder (default <projectDir>/include, overridable with --includePath, skipped with --noInclude), porting upstream Project/functions/copyInclude.ts.

The same bytes are embedded in the rotor binary via internal/includefiles (go:embed cannot reach above its package directory, so that package carries a second copy); internal/includefiles/includefiles_test.go fails if the two copies ever drift.