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import { GraphQLError } from "../../error/GraphQLError.mjs";
import { isObjectType, isInterfaceType, isInputObjectType } from "../../type/definition.mjs";
/**
* Unique field definition names
*
* A GraphQL complex type is only valid if all its fields are uniquely named.
*/
export function UniqueFieldDefinitionNamesRule(context) {
var schema = context.getSchema();
var existingTypeMap = schema ? schema.getTypeMap() : Object.create(null);
var knownFieldNames = Object.create(null);
return {
InputObjectTypeDefinition: checkFieldUniqueness,
InputObjectTypeExtension: checkFieldUniqueness,
InterfaceTypeDefinition: checkFieldUniqueness,
InterfaceTypeExtension: checkFieldUniqueness,
ObjectTypeDefinition: checkFieldUniqueness,
ObjectTypeExtension: checkFieldUniqueness
};
function checkFieldUniqueness(node) {
var _node$fields;
var typeName = node.name.value;
if (!knownFieldNames[typeName]) {
knownFieldNames[typeName] = Object.create(null);
} // istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2203')
var fieldNodes = (_node$fields = node.fields) !== null && _node$fields !== void 0 ? _node$fields : [];
var fieldNames = knownFieldNames[typeName];
for (var _i2 = 0; _i2 < fieldNodes.length; _i2++) {
var fieldDef = fieldNodes[_i2];
var fieldName = fieldDef.name.value;
if (hasField(existingTypeMap[typeName], fieldName)) {
context.reportError(new GraphQLError("Field \"".concat(typeName, ".").concat(fieldName, "\" already exists in the schema. It cannot also be defined in this type extension."), fieldDef.name));
} else if (fieldNames[fieldName]) {
context.reportError(new GraphQLError("Field \"".concat(typeName, ".").concat(fieldName, "\" can only be defined once."), [fieldNames[fieldName], fieldDef.name]));
} else {
fieldNames[fieldName] = fieldDef.name;
}
}
return false;
}
}
function hasField(type, fieldName) {
if (isObjectType(type) || isInterfaceType(type) || isInputObjectType(type)) {
return type.getFields()[fieldName] != null;
}
return false;
}
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