Raw NAPI Bridge

import ffi from 'liblibrary.so';

function load(libName: string): bigint;

const handle = ffi.load('libffi_target.so');

function close(handle: bigint): void;

function defineFunction(handle: bigint, funcName: string, argTypes: string, returnType: string): void;

ffi.defineFunction(handle, 'add', 'dd', 'd');

function callBySig(handle: bigint, funcName: string, numArgs: number[], strArgs: string[]): number;

ffi.callBySig(handle, 'add', [2.0, 3.0], []);

function callMixed(handle: bigint, funcName: string, argTypes: string, returnType: string, numArgs: number[], strArgs: string[]): number;

ffi.callMixed(handle, 'compute', 'ids', 'd', [0, 4.0], ['square']);

function callString(handle: bigint, funcName: string): string;

ffi.callString(handle, 'getVersion'); // → "1.0.0"

function readCString(ptr: number): string;

function callPtr(ptr: number, argTypes: string, returnType: string, numArgs: number[], strArgs: string[]): number;

function callPtrAsync(ptr: number, argTypes: string, returnType: string, numArgs: number[], strArgs: string[]): Promise<number>;

ffi.callPtrAsync(addPtr, 'dd', 'd', [2.0, 3.0], []).then(r => console.log(r));

function getSymbolPtr(handle: bigint, funcName: string): number;

function createCallback(callback: Function, argTypes: string, returnType: string, threadsafe?: boolean): number;

function destroyCallback(handle: number): void;

function invokeCallback(handle: number, ...args: any[]): any;

function getCallbackThreadsafe(handle: number): boolean;

function getCallbackPtr(handle: number): number;

function callCallbackThreadSafe(handle: number, arg: number): void;

function ptr(buffer: ArrayBuffer | TypedArray): number;

const buf = new ArrayBuffer(256);
const p = ffi.ptr(buf); // → memory address