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const isObject = (v) => !!v && typeof v === 'object' && !Array.isArray(v);
const areArraysEqual = (a, b) => {
if (a.length !== b.length) {
return false;
}
for (let i = 0; i < a.length; i++) {
if (a[i] !== b[i]) {
return false;
}
}
return true;
};
/**
* @returns {*|null} null means "do not store"
*/
const serialize = (value, defaultValue) => {
// Never serialize blobs.
if (value instanceof Blob) {
return null;
}
if (isObject(defaultValue)) {
const result = {};
for (const key of Object.keys(defaultValue)) {
if (!Object.prototype.hasOwnProperty.call(value, key)) {
continue;
}
const serialized = serialize(value[key], defaultValue[key]);
if (serialized !== null) {
result[key] = serialized;
}
}
if (Object.keys(result).length === 0) {
return null;
}
return result;
}
if (Array.isArray(value)) {
if (Array.isArray(defaultValue)) {
if (areArraysEqual(value, defaultValue)) {
return null;
}
} else {
return null;
}
}
if (value === defaultValue) {
return null;
}
return value;
};
export default serialize;
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