babel/packages/babel-parser/test/fixtures/experimental/pipeline-operator/hack-hash-proposal-percent-topic/options.json

{
  "plugins": [["pipelineOperator", { "proposal": "hack", "topicToken": "#" }]],
  "throws": "Invalid topic token %. In order to use % as a topic reference, the pipelineOperator plugin must be configured with { \"proposal\": \"hack\", \"topicToken\": \"%\" }. (1:9)"
}