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// @flow strict
import { GraphQLError } from '../../error/GraphQLError';
import type { ASTVisitor } from '../../language/visitor';
import type { ValidationContext } from '../ValidationContext';
/**
* No unused variables
*
* A GraphQL operation is only valid if all variables defined by an operation
* are used, either directly or within a spread fragment.
*/
export function NoUnusedVariablesRule(context: ValidationContext): ASTVisitor {
let variableDefs = [];
return {
OperationDefinition: {
enter() {
variableDefs = [];
},
leave(operation) {
const variableNameUsed = Object.create(null);
const usages = context.getRecursiveVariableUsages(operation);
for (const { node } of usages) {
variableNameUsed[node.name.value] = true;
}
for (const variableDef of variableDefs) {
const variableName = variableDef.variable.name.value;
if (variableNameUsed[variableName] !== true) {
context.reportError(
new GraphQLError(
operation.name
? `Variable "$${variableName}" is never used in operation "${operation.name.value}".`
: `Variable "$${variableName}" is never used.`,
variableDef,
),
);
}
}
},
},
VariableDefinition(def) {
variableDefs.push(def);
},
};
}
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