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index.js
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index.js
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const isObjectLike = (value) =>
value !== null &&
typeof value === "object" &&
!(value instanceof RegExp) &&
!(value instanceof Error) &&
!(value instanceof Date) &&
!(globalThis.Blob && value instanceof globalThis.Blob);
/**
* Recursively traverses an object or array and applies a function to each value.
* Mainly the same as JSON.parse(JSON.stringify(input, reviver)) but faster & async.
* See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse#Using_the_reviver_parameter
*
* @param input The object or array to traverse.
* @param mapper An optional function to apply to each value during traversal.
* @param key The current key being traversed (used for error messages).
* @param isSeen WeakMap of objects that have already been traversed (used to prevent circular references).
* @returns A Promise that resolves to the traversed object or array.
*/
const _traverse = async (source, mapper, key = "", isSeen = new WeakMap()) => {
if (isSeen.has(source)) {
return isSeen.get(source);
}
const data = mapper ? await mapper(key, source) : source;
if (Array.isArray(data)) {
const result = [...data];
isSeen.set(source, result);
for (let i = 0; i < data.length; i++) {
result[i] = await _traverse(result[i], mapper, `${i}`, isSeen);
}
return result;
}
if (isObjectLike(data)) {
const result = { ...data };
isSeen.set(source, result);
for (const [key, value] of Object.entries(result)) {
result[key] = await _traverse(value, mapper, `${key}`, isSeen);
}
return result;
}
return data;
};
export const traverse = (source, mapper) => {
return _traverse(source, mapper);
};