graphql
Version:
A Query Language and Runtime which can target any service.
42 lines • 1.99 kB
JavaScript
import { inspect } from "../../jsutils/inspect.mjs";
import { GraphQLError } from "../../error/GraphQLError.mjs";
import { isCompositeType } from "../../type/definition.mjs";
import { doTypesOverlap } from "../../utilities/typeComparators.mjs";
import { typeFromAST } from "../../utilities/typeFromAST.mjs";
export function PossibleFragmentSpreadsRule(context) {
return {
InlineFragment(node) {
const fragType = context.getType();
const parentType = context.getParentType();
if (isCompositeType(fragType) &&
isCompositeType(parentType) &&
!doTypesOverlap(context.getSchema(), fragType, parentType)) {
const parentTypeStr = inspect(parentType);
const fragTypeStr = inspect(fragType);
context.reportError(new GraphQLError(`Fragment cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`, { nodes: node }));
}
},
FragmentSpread(node) {
const fragName = node.name.value;
const fragType = getFragmentType(context, fragName);
const parentType = context.getParentType();
if (fragType &&
parentType &&
!doTypesOverlap(context.getSchema(), fragType, parentType)) {
const parentTypeStr = inspect(parentType);
const fragTypeStr = inspect(fragType);
context.reportError(new GraphQLError(`Fragment "${fragName}" cannot be spread here as objects of type "${parentTypeStr}" can never be of type "${fragTypeStr}".`, { nodes: node }));
}
},
};
}
function getFragmentType(context, name) {
const frag = context.getFragment(name);
if (frag) {
const type = typeFromAST(context.getSchema(), frag.typeCondition);
if (isCompositeType(type)) {
return type;
}
}
}
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