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32 lines
876 B
JavaScript
32 lines
876 B
JavaScript
"use strict";
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const isIterable = require("is-iterable");
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const map = require("../map");
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// FIXME: Untested
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module.exports = function treeMap(tree, mapper, options = {}) {
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let key = options.key ?? "children";
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function step(subtree) {
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let mapped = mapper(subtree);
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let modifiedProperties = {};
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if (isIterable(mapped[key])) {
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modifiedProperties[key] = mapped[key].map((item) => step(item));
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} else if (mapped[key] != null && typeof mapped[key] === "object") {
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modifiedProperties[key] = step(mapped[key]);
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}
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// We track modified properties separately and (immutably) merge them at the end, because it's the fastest way to ensure that we don't mutate the input object under any circumstances (even after we add multi-key support)
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return {
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... mapped,
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... modifiedProperties
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};
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}
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return isIterable(tree)
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? map(tree, step)
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: step(tree);
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};
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