code: function getSourceString(visitor, decl) {
    const code = visitor.code;
    if (code) {
      return code.slice(
        decl.source.start,
        decl.source.end
      );
    }
  
    assert.strictEqual(typeof decl.source.value, "string");
  
    return JSON.stringify(decl.source.value);
  }
docs: Gets a string representation (including quotes) from an import or export declaration node.