Tools/Scripts/webkitpy/benchmark_runner/benchmark_json_merge.py

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def deepAppend(value1, value2, currentKey=None):
    if type(value1) != type(value2):
        raise TypeError("values have different types for key: {}, {} and {}".format(currentKey, type(value1), type(value2)))
    if isinstance(value1, list):
        return value1 + value2

    result = {}
    for key in (value1.keys() + value2.keys()):
        if key not in result:
            result[key] = deepAppend(value1[key], value2[key], key)
    return result


def mergeJSONs(jsons):
    if len(jsons) == 0:
        raise TypeError("no jsons to merge")

    last = jsons.pop()
    return reduce(deepAppend, jsons, last)