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