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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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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);
- },
- };
-}