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index.ts
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index.ts
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import fs from "fs";
import path from "path";
const main = require.main?.path ?? process.cwd();
export default function lnjson<T extends any = any>(ln: string, interval: number = 0): T {
if (interval < 0) throw new Error(`Linked JSON save interval must be a positive number.`);
let target = {};
try {
if (!fs.existsSync(path.join(main, ln))) {
fs.writeFileSync(path.join(main, ln), "{}");
} else {
target = JSON.parse(fs.readFileSync(path.join(main, ln), "utf8"));
}
} catch {
throw new Error(`Unable to initiate linked JSON.`);
}
const save = () => fs.writeFileSync(path.join(main, ln), JSON.stringify(target, undefined, 4));
if (interval) setInterval(save, interval);
return new Proxy(target, {
apply() {
throw new Error(`Cannot call linked JSON as a function.`);
},
construct() {
throw new Error(`Cannot use the 'new' operator with linked JSON.`);
},
defineProperty(target, p, attributes) {
try {
return Reflect.defineProperty(target, p, attributes);
} finally {
if (!interval) save();
}
},
deleteProperty(target, p) {
try {
return Reflect.deleteProperty(target, p);
} finally {
if (!interval) save();
}
},
getOwnPropertyDescriptor(target, p) {
return Reflect.getOwnPropertyDescriptor(target, p);
},
get(target, p, receiver) {
return Reflect.get(target, p, receiver);
},
has(target, p) {
return Reflect.has(target, p);
},
set(target, p, value, receiver) {
try {
return Reflect.set(target, p, value, receiver);
} finally {
if (!interval) save();
}
},
ownKeys(target) {
return Reflect.ownKeys(target);
},
isExtensible(target) {
return Reflect.isExtensible(target);
},
preventExtensions(target) {
return Reflect.preventExtensions(target);
},
getPrototypeOf(target) {
return Reflect.getPrototypeOf(target);
},
setPrototypeOf(target, prototype) {
return Reflect.setPrototypeOf(target, prototype);
},
}) as T;
}