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41 lines
1.2 KiB
41 lines
1.2 KiB
import { groupBy } from '../../jsutils/groupBy.mjs'; |
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import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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/** |
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* Unique variable names |
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* |
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* A GraphQL operation is only valid if all its variables are uniquely named. |
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*/ |
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export function UniqueVariableNamesRule(context) { |
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return { |
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OperationDefinition(operationNode) { |
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var _operationNode$variab; |
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// See: https://github.com/graphql/graphql-js/issues/2203 |
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/* c8 ignore next */ |
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const variableDefinitions = |
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(_operationNode$variab = operationNode.variableDefinitions) !== null && |
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_operationNode$variab !== void 0 |
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? _operationNode$variab |
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: []; |
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const seenVariableDefinitions = groupBy( |
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variableDefinitions, |
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(node) => node.variable.name.value, |
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); |
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for (const [variableName, variableNodes] of seenVariableDefinitions) { |
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if (variableNodes.length > 1) { |
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context.reportError( |
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new GraphQLError( |
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`There can be only one variable named "$${variableName}".`, |
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{ |
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nodes: variableNodes.map((node) => node.variable.name), |
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}, |
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), |
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); |
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} |
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} |
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}, |
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}; |
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}
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