@theguild/federation-composition
Version:
Open Source Composition library for Apollo Federation
43 lines (42 loc) • 2.14 kB
JavaScript
import { GraphQLError } from 'graphql';
export function InterfaceKeyMissingImplementationTypeRule(context) {
return {
InterfaceType(interfaceState) {
let someSubgraphsAreMissingImplementation = false;
for (const interfaceStateInGraph of interfaceState.byGraph.values()) {
if (interfaceStateInGraph.keys.length === 0) {
continue;
}
if (interfaceStateInGraph.implementedBy.size === 0) {
someSubgraphsAreMissingImplementation = true;
break;
}
}
if (!someSubgraphsAreMissingImplementation) {
return;
}
for (const [graph, interfaceStateInGraph] of interfaceState.byGraph) {
if (interfaceStateInGraph.keys.length === 0) {
continue;
}
const firstKeyFields = interfaceStateInGraph.keys[0].fields;
const graphName = context.graphIdToName(graph);
const typesToDefine = Array.from(interfaceState.implementedBy)
.filter(objectTypeName => !interfaceStateInGraph.implementedBy.has(objectTypeName))
.sort();
context.reportError(new GraphQLError(`[${graphName}] Interface type "${interfaceState.name}" has a resolvable key () in subgraph "${graphName}" but that subgraph is missing some of the supergraph implementation types of "${interfaceState.name}". Subgraph "${graphName}" should define ${typesToDefine.length > 1 ? 'types' : 'type'} ${joinWithAnd(typesToDefine)} (and have ${typesToDefine.length > 1 ? 'them' : 'it'} implement "${interfaceState.name}").`, {
extensions: {
code: 'INTERFACE_KEY_MISSING_IMPLEMENTATION_TYPE',
},
}));
}
},
};
}
function joinWithAnd(list) {
if (list.length <= 2) {
return `"${list.join('" and "')}"`;
}
const last = list.pop();
return `"${list.join('", "')}" and "${last}"`;
}