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