engine biome(1.0)
language js(typescript, jsx)

or {
  JsMethodClassMember() as $method where {
    $method <: contains JsPrivateClassMemberName() as $name,
    $method <: r"async\s+#",
    $method <: contains `async` as $asyncToken,
    $name <: r"#(.*)"($bareName),
    $privateName = join(list = ["_", $bareName], separator = ""),
    register_diagnostic(
      span = $method,
      message = "JavaScript private class methods (#) should not be used in mixin-enabled modules. Use a TypeScript private method with an underscore prefix instead.",
      severity = "error"
    ),
    $asyncToken => `private async`,
    $name => $privateName
  },
  JsMethodClassMember() as $method where {
    $method <: contains JsPrivateClassMemberName() as $name,
    not $method <: r"async\s+#",
    $name <: r"#(.*)"($bareName),
    $privateName = join(list = ["private _", $bareName], separator = ""),
    register_diagnostic(
      span = $method,
      message = "JavaScript private class methods (#) should not be used in mixin-enabled modules. Use a TypeScript private method with an underscore prefix instead.",
      severity = "error"
    ),
    $name => $privateName
  },
  JsCallExpression() as $call where {
    $call <: contains JsPrivateName() as $name,
    $name <: r"#(.*)"($bareName),
    $privateName = join(list = ["_", $bareName], separator = ""),
    register_diagnostic(
      span = $call,
      message = "Calls to JavaScript private class methods (#) should use the underscore-prefixed TypeScript private method.",
      severity = "error"
    ),
    $name => $privateName
  }
}