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node_modules/graphql/utilities/assertValidName.mjs

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+import devAssert from '../jsutils/devAssert';
+import { GraphQLError } from '../error/GraphQLError';
+var NAME_RX = /^[_a-zA-Z][_a-zA-Z0-9]*$/;
+/**
+ * Upholds the spec rules about naming.
+ */
+
+export function assertValidName(name) {
+  var error = isValidNameError(name);
+
+  if (error) {
+    throw error;
+  }
+
+  return name;
+}
+/**
+ * Returns an Error if a name is invalid.
+ */
+
+export function isValidNameError(name, node) {
+  typeof name === 'string' || devAssert(0, 'Expected string');
+
+  if (name.length > 1 && name[0] === '_' && name[1] === '_') {
+    return new GraphQLError("Name \"".concat(name, "\" must not begin with \"__\", which is reserved by GraphQL introspection."), node);
+  }
+
+  if (!NAME_RX.test(name)) {
+    return new GraphQLError("Names must match /^[_a-zA-Z][_a-zA-Z0-9]*$/ but \"".concat(name, "\" does not."), node);
+  }
+}