Generate a typescript Interface from any object (does not support circular references)

genInterface.js

var identifierRegex = /^[A-Za-z_$]\w*$/;
function getType(v, indent) {
    switch (typeof v) {
        case "bigint":
        case "boolean":
        case "number":
        case "string":
        case "symbol":
            return typeof v + ";";
        case "function":
            if (v.length) {
                if (v.length > 10) return "(...args: any[]) => any;";
                return `(${Array.from({ length: v.length }, (_, i) => `p${i}: any`).join(", ")}) => any;`;
            }
            const str = v.toString();
            const mightHaveVarArgs =
                str === "function () { [native code] }"
                || str.includes("arguments")
                || /\(.+?\.{3}.+?\)/.test(str);
            if (mightHaveVarArgs) return "(...args: any[]) => any;";
            return "() => any;";
        case "object":
            if (v === null) return "any | null";
            return genInterface(v, true, indent + "    ");
        case "undefined":
            return "any | undefined;";
        default:
            throw new Error("??");
    }
}

function genInterface(obj, isInner = false, indent = "    ") {
    let inter = `${isInner ? "" : "interface RootObject "}{\n`;
    for (const key in obj) {
        const sanitizedKey = identifierRegex.test(key) ? key : JSON.stringify(key);
        inter += `${indent}${sanitizedKey}: ${getType(obj[key], indent)}\n`;
    }
    return `${inter}${indent.slice(4)}};`;
}

Z_DiscordNative.example.ts

interface RootObject {
    isRenderer: boolean;
    setUncaughtExceptionHandler: (...args: any[]) => any;
    nativeModules: {
        ensureModule: (...args: any[]) => any;
        requireModule: (...args: any[]) => any;
        canBootstrapNewUpdater: boolean;
    };
    process: {
        platform: string;
        arch: string;
        env: {
            DISCORD_TEST: any | undefined;
            DISCORD_GATEWAY_PLAINTEXT: any | undefined;
            DISCORD_DISALLOW_POPUPS: any | undefined;
            LOCALAPPDATA: string;
            "PROGRAMFILES(X86)": string;
            PROGRAMFILES: string;
            PROGRAMW6432: string;
            PROGRAMDATA: string;
        };
    };
    os: {
        release: string;
        arch: string;
    };
    app: {
        getReleaseChannel: (...args: any[]) => any;
        getVersion: (...args: any[]) => any;
        getModuleVersions: (...args: any[]) => any;
        getBuildNumber: (...args: any[]) => any;
        getPath: (...args: any[]) => any;
        setBadgeCount: (...args: any[]) => any;
        dock: {
            setBadge: (...args: any[]) => any;
            bounce: (...args: any[]) => any;
            cancelBounce: (...args: any[]) => any;
        };
        relaunch: (...args: any[]) => any;
        getDefaultDoubleClickAction: (...args: any[]) => any;
        registerUserInteractionHandler: (...args: any[]) => any;
    };
    clipboard: {
        copy: (...args: any[]) => any;
        copyImage: (...args: any[]) => any;
        cut: (...args: any[]) => any;
        paste: (...args: any[]) => any;
        read: (...args: any[]) => any;
    };
    ipc: {
        send: (...args: any[]) => any;
        on: (...args: any[]) => any;
        invoke: (...args: any[]) => any;
    };
    gpuSettings: {
        getEnableHardwareAcceleration: (...args: any[]) => any;
        setEnableHardwareAcceleration: (...args: any[]) => any;
    };
    window: {
        flashFrame: (...args: any[]) => any;
        minimize: (...args: any[]) => any;
        restore: (...args: any[]) => any;
        maximize: (...args: any[]) => any;
        focus: (...args: any[]) => any;
        blur: (...args: any[]) => any;
        fullscreen: (...args: any[]) => any;
        close: (...args: any[]) => any;
        setAlwaysOnTop: (...args: any[]) => any;
        isAlwaysOnTop: (...args: any[]) => any;
        setZoomFactor: (...args: any[]) => any;
        setBackgroundThrottling: (...args: any[]) => any;
        setProgressBar: (...args: any[]) => any;
        setDevtoolsCallbacks: (...args: any[]) => any;
        USE_OSX_NATIVE_TRAFFIC_LIGHTS: boolean;
    };
    powerMonitor: {
        on: (...args: any[]) => any;
        removeListener: (...args: any[]) => any;
        removeAllListeners: (...args: any[]) => any;
        getSystemIdleTimeMs: (...args: any[]) => any;
    };
    spellCheck: {
        on: (...args: any[]) => any;
        removeListener: (...args: any[]) => any;
        getAvailableDictionaries: (...args: any[]) => any;
        setLocale: (...args: any[]) => any;
        setLearnedWords: (...args: any[]) => any;
        replaceMisspelling: (...args: any[]) => any;
    };
    crashReporter: {
        updateCrashReporter: (...args: any[]) => any;
        getMetadata: (...args: any[]) => any;
    };
    desktopCapture: {
        getDesktopCaptureSources: (...args: any[]) => any;
    };
    fileManager: {
        readLogFiles: (...args: any[]) => any;
        readTimeSeriesLogFiles: (...args: any[]) => any;
        cleanupTempFiles: (...args: any[]) => any;
        saveWithDialog: (...args: any[]) => any;
        openFiles: (...args: any[]) => any;
        showOpenDialog: (...args: any[]) => any;
        showItemInFolder: (...args: any[]) => any;
        getModulePath: (...args: any[]) => any;
        getModuleDataPathSync: (...args: any[]) => any;
        getCrashFiles: (...args: any[]) => any;
        extname: (...args: any[]) => any;
        basename: (...args: any[]) => any;
        dirname: (...args: any[]) => any;
        join: (...args: any[]) => any;
    };
    processUtils: {
        flushDNSCache: (...args: any[]) => any;
        flushCookies: (...args: any[]) => any;
        getLastCrash: (...args: any[]) => any;
        flushStorageData: (...args: any[]) => any;
        purgeMemory: (...args: any[]) => any;
        getCurrentCPUUsagePercent: (...args: any[]) => any;
        getCurrentMemoryUsageKB: (...args: any[]) => any;
        getCPUCoreCount: (...args: any[]) => any;
        getMainArgvSync: (...args: any[]) => any;
    };
    powerSaveBlocker: {
        blockDisplaySleep: (...args: any[]) => any;
        unblockDisplaySleep: (...args: any[]) => any;
        cleanupDisplaySleep: (...args: any[]) => any;
    };
    http: {
        getAPIEndpoint: (...args: any[]) => any;
        makeChunkedRequest: (...args: any[]) => any;
    };
    accessibility: {
        isAccessibilitySupportEnabled: (...args: any[]) => any;
    };
    features: {
        supports: (...args: any[]) => any;
        declareSupported: (...args: any[]) => any;
    };
    settings: {
        get: (...args: any[]) => any;
        set: (...args: any[]) => any;
        getSync: (...args: any[]) => any;
    };
    userDataCache: {
        getCached: (...args: any[]) => any;
        cacheUserData: (...args: any[]) => any;
        deleteCache: (...args: any[]) => any;
    };
    thumbar: {
        setThumbarButtons: (...args: any[]) => any;
    };
    safeStorage: {
        isEncryptionAvailable: (...args: any[]) => any;
        decryptString: (...args: any[]) => any;
        encryptString: (...args: any[]) => any;
    };
    remoteApp: {
        getReleaseChannel: (...args: any[]) => any;
        getVersion: (...args: any[]) => any;
        getModuleVersions: (...args: any[]) => any;
        getBuildNumber: (...args: any[]) => any;
        getPath: (...args: any[]) => any;
        setBadgeCount: (...args: any[]) => any;
        dock: {
            setBadge: (...args: any[]) => any;
            bounce: (...args: any[]) => any;
            cancelBounce: (...args: any[]) => any;
        };
        relaunch: (...args: any[]) => any;
        getDefaultDoubleClickAction: (...args: any[]) => any;
        registerUserInteractionHandler: (...args: any[]) => any;
    };
    remotePowerMonitor: {
        on: (...args: any[]) => any;
        removeListener: (...args: any[]) => any;
        removeAllListeners: (...args: any[]) => any;
        getSystemIdleTimeMs: (...args: any[]) => any;
    };
};