Function resolveCppIncludePath

src/resolution/import-resolver.ts:686–706

* Resolve a C/C++ include path by searching include directories. * Called as a fallback after relative and aliased resolution fail.

(
  importPath: string,
  language: Language,
  context: ResolutionContext
)

 * Called as a fallback after relative and aliased resolution fail.
 */
function resolveCppIncludePath(
  importPath: string,
  language: Language,
  context: ResolutionContext
): string | null {
  const includeDirs = context.getCppIncludeDirs?.() ?? [];
  const extensions = EXTENSION_RESOLUTION[language] ?? [];

  for (const dir of includeDirs) {
    const normalizedDir = dir.replace(/\\/g, '/');
    for (const ext of extensions) {
      const candidate = normalizedDir + '/' + importPath + ext;
      if (context.fileExists(candidate)) return candidate;
    }
    // Try as-is (already has extension)
    const candidate = normalizedDir + '/' + importPath;
    if (context.fileExists(candidate)) return candidate;
  }

  return null;
}

/**
 * Is this reference a PHP include/require PATH (vs a namespace `use` symbol)?