@theguild/federation-composition
Version:
Open Source Composition library for Apollo Federation
59 lines (58 loc) • 3.21 kB
JavaScript
import { GraphQLError } from "graphql";
export function EnumValuesRule(context) {
return {
EnumType(enumTypeState) {
if (enumTypeState.referencedByInputType &&
enumTypeState.referencedByOutputType) {
const missingValues = [];
const total = enumTypeState.byGraph.size;
for (const [valueName, valueState] of enumTypeState.values) {
if (valueState.byGraph.size !== total) {
if (!valueState.inaccessible) {
missingValues.push(valueName);
}
}
}
if (missingValues.length === 0) {
return;
}
const exampleInputType = `(for example, as type of "${enumTypeState.inputTypeReferences.values().next().value}")`;
const exampleOutputType = `(for example, as type of "${enumTypeState.outputTypeReferences.values().next().value}")`;
for (const missingValue of missingValues) {
const valueState = enumTypeState.values.get(missingValue);
const definedIn = Array.from(valueState.byGraph.keys()).map(context.graphIdToName);
const notDefinedIn = Array.from(enumTypeState.byGraph.keys())
.filter((key) => !valueState.byGraph.has(key))
.map(context.graphIdToName);
const msg = [
`Enum type "${enumTypeState.name}" is used as both input type ${exampleInputType} and output type ${exampleOutputType},`,
`but value "${missingValue}" is not defined in all the subgraphs defining "${enumTypeState.name}":`,
`"${missingValue}" is defined in subgraph${definedIn.length > 1 ? "s" : ""} "${definedIn.join('", "')}"`,
`but not in subgraph${notDefinedIn.length > 1 ? "s" : ""} "${notDefinedIn.join('", "')}"`,
].join(" ");
context.reportError(new GraphQLError(msg, {
extensions: {
code: "ENUM_VALUE_MISMATCH",
},
}));
}
}
else if (enumTypeState.referencedByInputType) {
const valuesInCommon = [];
const total = enumTypeState.byGraph.size;
for (const [valueName, valueState] of enumTypeState.values) {
if (valueState.byGraph.size === total) {
valuesInCommon.push(valueName);
}
}
if (valuesInCommon.length === 0) {
context.reportError(new GraphQLError(`None of the values of enum type "${enumTypeState.name}" are defined consistently in all the subgraphs defining that type. As only values common to all subgraphs are merged, this would result in an empty type.`, {
extensions: {
code: "EMPTY_MERGED_ENUM_TYPE",
},
}));
}
}
},
};
}