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index.js
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index.js
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const fs = require("fs");
function readFile(file) {
let parsed;
try {
parsed = JSON.parse(fs.readFileSync(file, "utf8"));
} catch (err) {
if (err.code === "ENOENT") {
return {};
}
throw err;
}
if (typeof parsed === "object" && parsed && !Array.isArray(parsed)) {
return parsed;
}
throw new Error("File does not contain a JSON object");
}
class ProxyHandler {
constructor(file) {
this.file = file;
}
get(target, key) {
return target[key];
}
set(target, key, value) {
let json;
try {
json = JSON.stringify({
...target,
[key]: value,
});
} catch (err) {
throw new Error(
`Setting ${JSON.stringify(key)} to ${JSON.stringify(
value
)} would make this object unable to be serialized as JSON.`
);
}
fs.writeFileSync(this.file, json, "utf8");
target[key] = value;
return value;
}
deleteProperty(target, key) {
const testTarget = { ...target, [key]: undefined };
fs.writeFileSync(this.file, JSON.stringify(testTarget), "utf8");
return delete target[key];
}
}
module.exports = function jsonObject(options) {
return new Proxy(readFile(options.file), new ProxyHandler(options.file));
};