74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
import { inspect } from '../../jsutils/inspect.mjs';
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import { GraphQLError } from '../../error/GraphQLError.mjs';
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import { isCompositeType } from '../../type/definition.mjs';
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import { doTypesOverlap } from '../../utilities/typeComparators.mjs';
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import { typeFromAST } from '../../utilities/typeFromAST.mjs';
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/**
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* Possible fragment spread
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*
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* A fragment spread is only valid if the type condition could ever possibly
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* be true: if there is a non-empty intersection of the possible parent types,
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* and possible types which pass the type condition.
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*/
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export function PossibleFragmentSpreadsRule(context) {
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return {
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InlineFragment(node) {
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const fragType = context.getType();
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const parentType = context.getParentType();
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if (
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isCompositeType(fragType) &&
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isCompositeType(parentType) &&
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!doTypesOverlap(context.getSchema(), fragType, parentType)
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) {
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const parentTypeStr = inspect(parentType);
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const fragTypeStr = inspect(fragType);
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context.reportError(
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new GraphQLError(
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`Fragment cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`,
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{
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nodes: node,
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},
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),
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);
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}
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},
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FragmentSpread(node) {
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const fragName = node.name.value;
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const fragType = getFragmentType(context, fragName);
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const parentType = context.getParentType();
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if (
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fragType &&
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parentType &&
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!doTypesOverlap(context.getSchema(), fragType, parentType)
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) {
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const parentTypeStr = inspect(parentType);
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const fragTypeStr = inspect(fragType);
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context.reportError(
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new GraphQLError(
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`Fragment "${fragName}" cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`,
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{
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nodes: node,
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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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function getFragmentType(context, name) {
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const frag = context.getFragment(name);
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if (frag) {
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const type = typeFromAST(context.getSchema(), frag.typeCondition);
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if (isCompositeType(type)) {
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return type;
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}
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}
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}
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