"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.installFileWatcher = void 0;
const node_fs_1 = __importDefault(require("node:fs"));
const installFileWatcher = ({ file, onChange, }) => {
    const existedAtBeginning = node_fs_1.default.existsSync(file);
    let existedBefore = existedAtBeginning;
    const listener = () => {
        const existsNow = node_fs_1.default.existsSync(file);
        if (!existedBefore && existsNow) {
            onChange('created');
            existedBefore = true;
            return;
        }
        if (existedBefore && !existsNow) {
            onChange('deleted');
            existedBefore = false;
            return;
        }
        if (existsNow) {
            if (typeof Deno !== 'undefined') {
                // Deno always goes here, even if the file has not changed.
                // Don't support this for now.
                return;
            }
            onChange('changed');
        }
    };
    node_fs_1.default.watchFile(file, { interval: 100 }, listener);
    return {
        exists: existedAtBeginning,
        unwatch: () => {
            node_fs_1.default.unwatchFile(file, listener);
        },
    };
};
exports.installFileWatcher = installFileWatcher;