babel/packages/babel-parser/test/fixtures/experimental/pipeline-operator-hack/hack-percent-proposal-hash-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)"
}