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47 lines
1.2 KiB
47 lines
1.2 KiB
import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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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(context) { |
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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 ( |
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schema !== null && |
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schema !== void 0 && |
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schema.getDirective(directiveName) |
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) { |
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context.reportError( |
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new GraphQLError( |
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`Directive "@${directiveName}" already exists in the schema. It cannot be redefined.`, |
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{ |
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nodes: node.name, |
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}, |
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), |
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); |
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return; |
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} |
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if (knownDirectiveNames[directiveName]) { |
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context.reportError( |
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new GraphQLError( |
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`There can be only one directive named "@${directiveName}".`, |
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{ |
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nodes: [knownDirectiveNames[directiveName], node.name], |
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}, |
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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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