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25 lines
831 B
25 lines
831 B
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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var knownVariableNames = Object.create(null);
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return {
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OperationDefinition: function OperationDefinition() {
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knownVariableNames = Object.create(null);
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},
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VariableDefinition: function VariableDefinition(node) {
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var variableName = node.variable.name.value;
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if (knownVariableNames[variableName]) {
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context.reportError(new GraphQLError("There can be only one variable named \"$".concat(variableName, "\"."), [knownVariableNames[variableName], node.variable.name]));
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} else {
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knownVariableNames[variableName] = node.variable.name;
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}
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}
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};
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}
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