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