flow like the river

BACK_BACK/node_modules/graphql/utilities/assertValidName.js

@@ -0,0 +1,44 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.assertValidName = assertValidName;
+exports.isValidNameError = isValidNameError;
+
+var _devAssert = _interopRequireDefault(require("../jsutils/devAssert.js"));
+
+var _GraphQLError = require("../error/GraphQLError.js");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var NAME_RX = /^[_a-zA-Z][_a-zA-Z0-9]*$/;
+/**
+ * Upholds the spec rules about naming.
+ */
+
+function assertValidName(name) {
+  var error = isValidNameError(name);
+
+  if (error) {
+    throw error;
+  }
+
+  return name;
+}
+/**
+ * Returns an Error if a name is invalid.
+ */
+
+
+function isValidNameError(name) {
+  typeof name === 'string' || (0, _devAssert.default)(0, 'Expected name to be a string.');
+
+  if (name.length > 1 && name[0] === '_' && name[1] === '_') {
+    return new _GraphQLError.GraphQLError("Name \"".concat(name, "\" must not begin with \"__\", which is reserved by GraphQL introspection."));
+  }
+
+  if (!NAME_RX.test(name)) {
+    return new _GraphQLError.GraphQLError("Names must match /^[_a-zA-Z][_a-zA-Z0-9]*$/ but \"".concat(name, "\" does not."));
+  }
+}