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// @flow strict
import devAssert from '../jsutils/devAssert';
import { GraphQLError } from '../error/GraphQLError';
const NAME_RX = /^[_a-zA-Z][_a-zA-Z0-9]*$/;
/**
* Upholds the spec rules about naming.
*/
export function assertValidName(name: string): string {
const error = isValidNameError(name);
if (error) {
throw error;
}
return name;
}
/**
* Returns an Error if a name is invalid.
*/
export function isValidNameError(name: string): GraphQLError | void {
devAssert(typeof name === 'string', 'Expected name to be a string.');
if (name.length > 1 && name[0] === '_' && name[1] === '_') {
return new GraphQLError(
`Name "${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]*$/ but "${name}" does not.`,
);
}
}
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