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VarStore.js

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export default function VarStore(def) {

let v = def;

function get() {

const ret = v;

set(def);

return ret;

}

function peak() {

return v;

}

function set(val) {

return v = val;

}

function isSet() {

return v !== def;

}

const ret = {

get, set, peak, isSet, value: v,

};

Object.defineProperty(ret, 'value', {

get,

set,

});

return Object.freeze(ret);

}