trilium/apps/server/src/routes/electron.ts

import electron from "electron";

interface Response {
    statusCode: number;
    getHeader: (name: string) => string;
    setHeader: (name: string, value: string) => Response;
    header: (name: string, value: string) => Response;
    status: (statusCode: number) => Response;
    send: (obj: {}) => void; // eslint-disable-line @typescript-eslint/no-empty-object-type
}

function init(app: Express.Application) {
    electron.ipcMain.on("server-request", (event, arg) => {
        const req = {
            url: arg.url,
            method: arg.method,
            body: arg.data,
            headers: arg.headers,
            session: {
                loggedIn: true
            }
        };

        const respHeaders: Record<string, string> = {};

        const res: Response = {
            statusCode: 200,
            getHeader: (name) => respHeaders[name],
            setHeader: (name, value) => {
                respHeaders[name] = value.toString();
                return res;
            },
            header: (name, value) => {
                respHeaders[name] = value.toString();
                return res;
            },
            status: (statusCode) => {
                res.statusCode = statusCode;
                return res;
            },
            send: (obj) => {
                event.sender.send("server-response", {
                    url: arg.url,
                    method: arg.method,
                    requestId: arg.requestId,
                    statusCode: res.statusCode,
                    headers: respHeaders,
                    body: obj
                });
            }
        };

        return (app as any)._router.handle(req, res, () => {});
    });
}

export default init;