preload.ts

const { contextBridge, ipcRenderer } = require('electron');

contextBridge.exposeInMainWorld('electronAPI', {
	getVideoInfo: (url: unknown) => {
		if (typeof url !== 'string') {
			return Promise.reject(new Error('URL must be a string'));
		}
		return ipcRenderer.invoke('get-video-info', { url });
	},
	openFileDialog: () => ipcRenderer.invoke('open-file-dialog'),
	getLocalFileInfo: (filePath: unknown) => {
		if (typeof filePath !== 'string') {
			return Promise.reject(new Error('filePath must be a string'));
		}
		return ipcRenderer.invoke('get-local-file-info', { filePath });
	},
	downloadMP3: (params: unknown) => {
		if (params == null || typeof params !== 'object' || Array.isArray(params)) {
			return Promise.reject(new Error('Params must be an object'));
		}
		const { url, sourceFilePath, title, startTime, endTime, playbackSpeed } = params as Record<string, unknown>;
		return ipcRenderer.invoke('download-mp3', {
			url: url != null ? url : undefined,
			sourceFilePath: sourceFilePath != null ? sourceFilePath : undefined,
			title: title != null ? title : undefined,
			startTime: startTime != null ? startTime : undefined,
			endTime: endTime != null ? endTime : undefined,
			playbackSpeed: playbackSpeed != null ? playbackSpeed : undefined,
		});
	},
	showItemInFolder: (filePath: unknown) => {
		if (typeof filePath !== 'string') {
			return Promise.reject(new Error('filePath must be a string'));
		}
		return ipcRenderer.invoke('show-item-in-folder', { filePath });
	},
	onProcessingPhase: (callback: (phase: 'downloading' | 'converting') => void) => {
		const listener = (_event: unknown, phase: 'downloading' | 'converting') => callback(phase);
		ipcRenderer.on('processing-phase', listener);
		return () => {
			ipcRenderer.removeListener('processing-phase', listener);
		};
	},
});