@apollo/client
Version:
A fully-featured caching GraphQL client.
68 lines (67 loc) • 2.71 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.DeepMerger = void 0;
const isNonNullObject_js_1 = require("./isNonNullObject.cjs");
const { hasOwnProperty } = Object.prototype;
const defaultReconciler = function (target, source, property) {
return this.merge(target[property], source[property]);
};
/**
* @internal
*
* @deprecated This is an internal API and should not be used directly. This can be removed or changed at any time.
*/
class DeepMerger {
reconciler;
constructor(reconciler = defaultReconciler) {
this.reconciler = reconciler;
}
merge(target, source, ...context) {
if ((0, isNonNullObject_js_1.isNonNullObject)(source) && (0, isNonNullObject_js_1.isNonNullObject)(target)) {
Object.keys(source).forEach((sourceKey) => {
if (hasOwnProperty.call(target, sourceKey)) {
const targetValue = target[sourceKey];
if (source[sourceKey] !== targetValue) {
const result = this.reconciler(target, source, sourceKey, ...context);
// A well-implemented reconciler may return targetValue to indicate
// the merge changed nothing about the structure of the target.
if (result !== targetValue) {
target = this.shallowCopyForMerge(target);
target[sourceKey] = result;
}
}
}
else {
// If there is no collision, the target can safely share memory with
// the source, and the recursion can terminate here.
target = this.shallowCopyForMerge(target);
target[sourceKey] = source[sourceKey];
}
});
return target;
}
// If source (or target) is not an object, let source replace target.
return source;
}
isObject = isNonNullObject_js_1.isNonNullObject;
pastCopies = new Set();
shallowCopyForMerge(value) {
if ((0, isNonNullObject_js_1.isNonNullObject)(value)) {
if (!this.pastCopies.has(value)) {
if (Array.isArray(value)) {
value = value.slice(0);
}
else {
value = {
__proto__: Object.getPrototypeOf(value),
...value,
};
}
this.pastCopies.add(value);
}
}
return value;
}
}
exports.DeepMerger = DeepMerger;
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