function _isPrivate()

in src/assembler.ts [2537:2578]
33 lines of code
11 McCabe index (conditional complexity)

function _isPrivate(symbol: ts.Symbol): boolean {
  // Private identifiers are always private...
  if (symbol.name.startsWith('#')) {
    return true;
  }

  const TYPE_DECLARATION_KINDS = new Set([
    ts.SyntaxKind.ClassDeclaration,
    ts.SyntaxKind.InterfaceDeclaration,
    ts.SyntaxKind.EnumDeclaration,
  ]);

  // if the symbol doesn't have a value declaration, we are assuming it's a type (enum/interface/class)
  // and check that it has an "export" modifier
  if (
    !isInternalSymbol(symbol) &&
    (!symbol.valueDeclaration || TYPE_DECLARATION_KINDS.has(symbol.valueDeclaration.kind))
  ) {
    let hasExport = false;
    for (const decl of symbol.declarations ?? []) {
      if (ts.getCombinedModifierFlags(decl) & ts.ModifierFlags.Export) {
        hasExport = true;
        break;
      }
      // Handle nested classes from project references
      if (ts.isModuleBlock(decl.parent)) {
        const moduleDeclaration = decl.parent.parent;
        const modifiers = ts.getCombinedModifierFlags(moduleDeclaration);
        // The trick is the module is declared as ambient & exported
        if ((modifiers & ts.ModifierFlags.Ambient) !== 0 && (modifiers & ts.ModifierFlags.Export) !== 0) {
          hasExport = true;
          break;
        }
      }
    }
    return !hasExport;
  }

  const decl = symbol.valueDeclaration ?? symbol.declarations?.[0];

  return decl != null && (ts.getCombinedModifierFlags(decl) & ts.ModifierFlags.Private) !== 0;
}