@theguild/federation-composition
Version:
Open Source Composition library for Apollo Federation
50 lines (49 loc) • 2.43 kB
JavaScript
import { GraphQLError } from "graphql";
import { andList } from "../../../utils/format.js";
import { isRealExtension } from "../../composition/object-type.js";
export function ExternalTypeMismatchRule(context) {
return {
ObjectTypeField(objectTypeState, fieldState) {
if (fieldState.usedAsKey) {
return;
}
const groupByType = new Map();
const graphsWithEqualType = [];
for (const [graphId, field] of fieldState.byGraph) {
const graphVersion = context.subgraphStates.get(graphId).federation.version;
const isExternal = graphVersion === "v1.0"
? field.external &&
isRealExtension(objectTypeState.byGraph.get(graphId), graphVersion)
: field.external;
if (!isExternal) {
graphsWithEqualType.push(graphId);
continue;
}
if (field.type === fieldState.type) {
graphsWithEqualType.push(graphId);
continue;
}
const existing = groupByType.get(field.type);
if (existing) {
existing.push(graphId);
}
else {
groupByType.set(field.type, [graphId]);
}
}
if (groupByType.size && graphsWithEqualType.length) {
const groups = Array.from(groupByType.entries()).map(([type, graphs]) => {
const plural = graphs.length > 1 ? "s" : "";
return `type "${type}" in subgraph${plural} ${andList(graphs.map(context.graphIdToName), true, '"')}`;
});
const [first, ...rest] = groups;
const nonExternal = `type "${fieldState.type}" in subgraph${graphsWithEqualType.length > 1 ? "s" : ""} ${andList(graphsWithEqualType.map(context.graphIdToName), true, '"')}`;
context.reportError(new GraphQLError(`Type of field "${objectTypeState.name}.${fieldState.name}" is incompatible across subgraphs (where marked @external): it has ${nonExternal} but ${first}${rest.length ? ` and ${rest.join(" and ")}` : ""}`, {
extensions: {
code: "EXTERNAL_TYPE_MISMATCH",
},
}));
}
},
};
}