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// @flow strict
import { GraphQLError } from '../../error/GraphQLError';
import type { ASTVisitor } from '../../language/visitor';
import type { SDLValidationContext } from '../ValidationContext';
/**
* Unique directive names
*
* A GraphQL document is only valid if all defined directives have unique names.
*/
export function UniqueDirectiveNamesRule(
context: SDLValidationContext,
): ASTVisitor {
const knownDirectiveNames = Object.create(null);
const schema = context.getSchema();
return {
DirectiveDefinition(node) {
const directiveName = node.name.value;
if (schema?.getDirective(directiveName)) {
context.reportError(
new GraphQLError(
`Directive "@${directiveName}" already exists in the schema. It cannot be redefined.`,
node.name,
),
);
return;
}
if (knownDirectiveNames[directiveName]) {
context.reportError(
new GraphQLError(
`There can be only one directive named "@${directiveName}".`,
[knownDirectiveNames[directiveName], node.name],
),
);
} else {
knownDirectiveNames[directiveName] = node.name;
}
return false;
},
};
}
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