59 lines
2.1 KiB
JavaScript
59 lines
2.1 KiB
JavaScript
// istanbul ignore next
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const isObject = (obj) => {
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if (typeof obj === "object" && obj !== null) {
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if (typeof Object.getPrototypeOf === "function") {
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const prototype = Object.getPrototypeOf(obj);
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return prototype === Object.prototype || prototype === null;
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}
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return Object.prototype.toString.call(obj) === "[object Object]";
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}
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return false;
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};
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export const merge = (...objects) => objects.reduce((result, current) => {
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if (current === undefined) {
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return result;
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}
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if (Array.isArray(current)) {
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throw new TypeError("Arguments provided to ts-deepmerge must be objects, not arrays.");
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}
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Object.keys(current).forEach((key) => {
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if (["__proto__", "constructor", "prototype"].includes(key)) {
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return;
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}
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if (Array.isArray(result[key]) && Array.isArray(current[key])) {
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result[key] = merge.options.mergeArrays
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? merge.options.uniqueArrayItems
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? Array.from(new Set(result[key].concat(current[key])))
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: [...result[key], ...current[key]]
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: current[key];
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}
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else if (isObject(result[key]) && isObject(current[key])) {
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result[key] = merge(result[key], current[key]);
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}
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else if (!isObject(result[key]) && isObject(current[key])) {
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result[key] = merge(current[key], undefined);
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}
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else {
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result[key] =
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current[key] === undefined
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? merge.options.allowUndefinedOverrides
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? current[key]
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: result[key]
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: current[key];
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}
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});
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return result;
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}, {});
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const defaultOptions = {
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allowUndefinedOverrides: true,
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mergeArrays: true,
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uniqueArrayItems: true,
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};
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merge.options = defaultOptions;
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merge.withOptions = (options, ...objects) => {
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merge.options = Object.assign(Object.assign({}, defaultOptions), options);
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const result = merge(...objects);
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merge.options = defaultOptions;
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return result;
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};
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