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import { GraphQLError } from "../../error/GraphQLError.mjs";
/**
* Unique variable names
*
* A GraphQL operation is only valid if all its variables are uniquely named.
*/
export function UniqueVariableNamesRule(context) {
var knownVariableNames = Object.create(null);
return {
OperationDefinition: function OperationDefinition() {
knownVariableNames = Object.create(null);
},
VariableDefinition: function VariableDefinition(node) {
var variableName = node.variable.name.value;
if (knownVariableNames[variableName]) {
context.reportError(new GraphQLError("There can be only one variable named \"$".concat(variableName, "\"."), [knownVariableNames[variableName], node.variable.name]));
} else {
knownVariableNames[variableName] = node.variable.name;
}
}
};
}
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