@graphql-tools/merge
Version:
A set of utils for faster development of GraphQL tools
82 lines (81 loc) • 3.81 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.mergeFields = mergeFields;
const utils_1 = require("@graphql-tools/utils");
const arguments_js_1 = require("./arguments.js");
const directives_js_1 = require("./directives.js");
const utils_js_1 = require("./utils.js");
function fieldAlreadyExists(fieldsArr, otherField) {
const resultIndex = fieldsArr.findIndex(field => field.name.value === otherField.name.value);
return [resultIndex > -1 ? fieldsArr[resultIndex] : null, resultIndex];
}
function mergeFields(type, f1, f2, config, directives) {
const result = [];
if (f2 != null) {
result.push(...f2);
}
if (f1 != null) {
for (const field of f1) {
const [existing, existingIndex] = fieldAlreadyExists(result, field);
if (existing && !config?.ignoreFieldConflicts) {
const newField = (config?.onFieldTypeConflict &&
config.onFieldTypeConflict(existing, field, type, config?.throwOnConflict)) ||
preventConflicts(type, existing, field, config?.throwOnConflict);
newField.arguments = (0, arguments_js_1.mergeArguments)(field['arguments'] || [], existing['arguments'] || [], config);
newField.directives = (0, directives_js_1.mergeDirectives)(field.directives, existing.directives, config, directives);
newField.description = field.description || existing.description;
result[existingIndex] = newField;
}
else {
result.push(field);
}
}
}
if (config && config.sort) {
result.sort(utils_1.compareNodes);
}
if (config && config.exclusions) {
const exclusions = config.exclusions;
return result.filter(field => !exclusions.includes(`${type.name.value}.${field.name.value}`));
}
return result;
}
function preventConflicts(type, a, b, ignoreNullability = false) {
const aType = (0, utils_js_1.printTypeNode)(a.type);
const bType = (0, utils_js_1.printTypeNode)(b.type);
if (aType !== bType) {
const t1 = (0, utils_js_1.extractType)(a.type);
const t2 = (0, utils_js_1.extractType)(b.type);
if (t1.name.value !== t2.name.value) {
throw new Error(`Field "${b.name.value}" already defined with a different type. Declared as "${t1.name.value}", but you tried to override with "${t2.name.value}"`);
}
if (!safeChangeForFieldType(a.type, b.type, !ignoreNullability)) {
throw new Error(`Field '${type.name.value}.${a.name.value}' changed type from '${aType}' to '${bType}'`);
}
}
if ((0, utils_js_1.isNonNullTypeNode)(b.type) && !(0, utils_js_1.isNonNullTypeNode)(a.type)) {
a.type = b.type;
}
return a;
}
function safeChangeForFieldType(oldType, newType, ignoreNullability = false) {
// both are named
if (!(0, utils_js_1.isWrappingTypeNode)(oldType) && !(0, utils_js_1.isWrappingTypeNode)(newType)) {
return oldType.toString() === newType.toString();
}
// new is non-null
if ((0, utils_js_1.isNonNullTypeNode)(newType)) {
const ofType = (0, utils_js_1.isNonNullTypeNode)(oldType) ? oldType.type : oldType;
return safeChangeForFieldType(ofType, newType.type);
}
// old is non-null
if ((0, utils_js_1.isNonNullTypeNode)(oldType)) {
return safeChangeForFieldType(newType, oldType, ignoreNullability);
}
// old is list
if ((0, utils_js_1.isListTypeNode)(oldType)) {
return (((0, utils_js_1.isListTypeNode)(newType) && safeChangeForFieldType(oldType.type, newType.type)) ||
((0, utils_js_1.isNonNullTypeNode)(newType) && safeChangeForFieldType(oldType, newType['type'])));
}
return false;
}