Files, tags, includes

Everything the compiler reads is CL++. The extension only chooses role.

Extension	Role	C++ analog	Emitted?
`.clh`	Header: `struct`, constants, prototypes	`.h`	Types and constants; no function bodies
`.clp`	Module implementation	`.c` / untagged `.cpp`	ModuleScript by default
`.clpp`	Script / methods	`.cpp`	Script / LocalScript / ModuleScript from the tag

Prefer .clh + .clpp: declare in the header, define in the script.

Filename tags

Source	Instance
`Foo.server.clpp`	Script
`Foo.client.clpp`	LocalScript
`Foo.plugin.clpp`	Plugin Script
`Foo.legacy.clpp`	Legacy Script
`Foo.clp` / `Foo.clpp` (no tag)	ModuleScript
`Foo.clh`	type ModuleScript

Includes

#include <clpp/roblox.clh>
#include <clpp/libs/janitor.clh>
#include "LeaderstatsServer.clh"
#include "../shared/PlayerData.clh"

Form	Effect
`<clpp/roblox.clh>`	IntelliSense only
`<clpp/libs/janitor.clh>`	IntelliSense and `require`
`"Stem.clh"` with the same stem	Inlined into the `.clpp`
`"Other.clh"`	`require`

#pragma once is valid in .clh (include guard). #pragma strict → --!strict. #pragma nostrict → --!nonstrict. #pragma native → --!native. #pragma optimize / #pragma optimize 2 → --!optimize 2.

using …; is skipped. namespace { } is flattened. // and /* */ comments are stripped.

Next: Types and values.