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// @flow strict
import { GraphQLError } from '../../error/GraphQLError';
import type { ASTVisitor } from '../../language/visitor';
import type { ASTValidationContext } from '../ValidationContext';
/**
* No unused fragments
*
* A GraphQL document is only valid if all fragment definitions are spread
* within operations, or spread within other fragments spread within operations.
*/
export function NoUnusedFragmentsRule(
context: ASTValidationContext,
): ASTVisitor {
const operationDefs = [];
const fragmentDefs = [];
return {
OperationDefinition(node) {
operationDefs.push(node);
return false;
},
FragmentDefinition(node) {
fragmentDefs.push(node);
return false;
},
Document: {
leave() {
const fragmentNameUsed = Object.create(null);
for (const operation of operationDefs) {
for (const fragment of context.getRecursivelyReferencedFragments(
operation,
)) {
fragmentNameUsed[fragment.name.value] = true;
}
}
for (const fragmentDef of fragmentDefs) {
const fragName = fragmentDef.name.value;
if (fragmentNameUsed[fragName] !== true) {
context.reportError(
new GraphQLError(
`Fragment "${fragName}" is never used.`,
fragmentDef,
),
);
}
}
},
},
};
}
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