Function isNonModuleWithAmbiantDeclarations

compiler/companion/src/AST.ts:560–595

(sourceFile: ts.SourceFile)

function isFileAffectingGlobalScope(sourceFile: ts.SourceFile): boolean {
  return (
    containsGlobalScopeAugmentation(sourceFile) ||
    (!isExternalOrCommonJsModule(sourceFile) &&
      !isJsonSourceFile(sourceFile) &&
      !containsOnlyAmbientModules(sourceFile))
  );
}

export function isNonModuleWithAmbiantDeclarations(sourceFile: ts.SourceFile): boolean {
  const statements = sourceFile.statements;

  if (!statements.length) {
    return false;
  }

  let hasAmbiantModuleDeclarations = false;
  let hasImport = false;
  let hasExports = false;

  for (const statement of statements) {
    const modifiers = ts.getCombinedModifierFlags(statement as unknown as ts.Declaration);
    const isAmbiant = (modifiers & ts.ModifierFlags.Ambient) != 0;
    const isExports = (modifiers & ts.ModifierFlags.Export) !== 0;

    if (isAmbiant) {
      if (ts.isModuleDeclaration(statement) && ts.isStringLiteral(statement.name)) {
        hasAmbiantModuleDeclarations = true;
      }
    }
    if (isExports) {
      hasExports = true;
    }

    if (ts.isExportDeclaration(statement) || ts.isExportAssignment(statement)) {
      hasExports = true;
    }

    if (ts.isImportDeclaration(statement) || ts.isImportEqualsDeclaration(statement)) {
      hasImport = true;