'use strict';
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var isObject = require('is-extendable');
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var union = require('arr-union');
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var get = require('get-value');
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var set = require('set-value');
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module.exports = function unionValue(obj, prop, value) {
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if (!isObject(obj)) {
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throw new TypeError('union-value expects the first argument to be an object.');
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}
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if (typeof prop !== 'string') {
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throw new TypeError('union-value expects `prop` to be a string.');
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}
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var arr = arrayify(get(obj, prop));
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set(obj, prop, union(arr, arrayify(value)));
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return obj;
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};
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function arrayify(val) {
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if (val === null || typeof val === 'undefined') {
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return [];
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}
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if (Array.isArray(val)) {
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return val;
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}
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return [val];
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}
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