feat: platform specific open options (#2428)

Make it a bit easier to have platform specific open options. I'm in love with the solution but it doesn't seem possible to filter the generic via a typecheck and have it apply to the open options. So casting the open options is the only recouse I've figured out.

packages/serialport/lib/index.test.ts

@@ -3,6 +3,7 @@ import { randomBytes } from 'crypto'
 import { SerialPort as SerialPortAutoDetect, SerialPortMock } from './'
 import { assert } from '../../../test/assert'
 import { testOnPlatform } from '../../../test/testOnPlatform'
+import { LinuxBinding, LinuxOpenOptions } from '@serialport/bindings-cpp'
 
 const platform = process.platform
 if (platform !== 'win32' && platform !== 'darwin' && platform !== 'linux') {
@@ -31,13 +32,13 @@ function testSerialPortClass(
 
     beforeEach(() => {
       if (platform === 'mock') {
-        SerialPortMock.MockBinding.createPort('/dev/exists', { echo: true, maxReadSize: 50 })
+        SerialPortMock.binding.createPort('/dev/exists', { echo: true, maxReadSize: 50 })
       }
     })
 
     afterEach(() => {
       if (platform === 'mock') {
-        SerialPortMock.MockBinding.reset()
+        SerialPortMock.binding.reset()
       }
     })
 
@@ -73,6 +74,16 @@ function testSerialPortClass(
           done()
         })
       })
+
+      it('allows platform specific options', done => {
+        new SerialPort({
+          path: '/bad/port',
+          baudRate: 9600,
+          vmin: 10,
+        } as LinuxOpenOptions).on('error', () => {
+          done()
+        })
+      })
     })
 
     describe('opening and closing', () => {

packages/serialport/lib/serialport-mock.ts

@@ -5,7 +5,7 @@ export type SerialPortMockOpenOptions = Omit<OpenOptions<MockBindingInterface>,
 
 export class SerialPortMock extends SerialPortStream<MockBindingInterface> {
   static list = MockBinding.list
-  static readonly MockBinding = MockBinding
+  static readonly binding = MockBinding
 
   constructor(options: SerialPortMockOpenOptions, openCallback?: ErrorCallback) {
     const opts: OpenOptions<MockBindingInterface> = {

packages/serialport/lib/serialport.ts

@@ -1,11 +1,11 @@
-import { ErrorCallback, OpenOptions, SerialPortStream } from '@serialport/stream'
-import { autoDetect, AutoDetectTypes } from '@serialport/bindings-cpp'
+import { ErrorCallback, OpenOptions, SerialPortStream, StreamOptions } from '@serialport/stream'
+import { autoDetect, AutoDetectTypes, OpenOptionsFromBinding } from '@serialport/bindings-cpp'
 
 const DetectedBinding = autoDetect()
 
-export type SerialPortOpenOptions = Omit<OpenOptions<AutoDetectTypes>, 'binding'>
+export type SerialPortOpenOptions<T extends AutoDetectTypes> = Omit<StreamOptions<T>, 'binding'> & OpenOptionsFromBinding<T>
 
-export class SerialPort extends SerialPortStream<AutoDetectTypes> {
+export class SerialPort<T extends AutoDetectTypes = AutoDetectTypes> extends SerialPortStream<T> {
   /**
    * Retrieves a list of available serial ports with metadata. Only the `path` is guaranteed. If unavailable the other fields will be undefined. The `path` is either the path or an identifier (eg `COM1`) used to open the SerialPort.
    *
@@ -57,10 +57,11 @@ export class SerialPort extends SerialPortStream<AutoDetectTypes> {
   ```
   */
   static list = DetectedBinding.list
+  static readonly binding = DetectedBinding
 
-  constructor(options: SerialPortOpenOptions, openCallback?: ErrorCallback) {
-    const opts: OpenOptions<AutoDetectTypes> = {
-      binding: DetectedBinding,
+  constructor(options: SerialPortOpenOptions<T>, openCallback?: ErrorCallback) {
+    const opts: OpenOptions<T> = {
+      binding: DetectedBinding as T,
       ...options,
     }
     super(opts, openCallback)

packages/stream/lib/index.ts

@@ -1,9 +1,18 @@
 import { Duplex } from 'stream'
 import debugFactory from 'debug'
-import { SetOptions, BindingInterface, PortInterfaceFromBinding, OpenOptions as BindingOpenOptions } from '@serialport/bindings-interface'
+import { SetOptions, BindingInterface, PortInterfaceFromBinding, OpenOptionsFromBinding } from '@serialport/bindings-interface'
 const debug = debugFactory('serialport/stream')
 
-interface InternalSettings<T extends BindingInterface> extends OpenOptions<T> {
+export class DisconnectedError extends Error {
+  disconnected: true
+  constructor(message: string) {
+    super(message)
+    this.disconnected = true
+  }
+}
+
+interface InternalSettings<T extends BindingInterface> {
+  binding: T
   autoOpen: boolean
   endOnClose: boolean
   highWaterMark: number
@@ -33,12 +42,14 @@ export type ErrorCallback = (err: Error | null) => void
 
 export type ModemBitsCallback = (err: Error | null, options?: { cts: boolean; dsr: boolean; dcd: boolean }) => void
 
+export type OpenOptions<T extends BindingInterface = BindingInterface> = StreamOptions<T> & OpenOptionsFromBinding<T>
+
 /**
  * Options to open a port
  */
-export interface OpenOptions<T extends BindingInterface> extends BindingOpenOptions {
+export interface StreamOptions<T extends BindingInterface> {
   /**
-   * The hardware access binding. `Bindings` are how Node-Serialport talks to the underlying system. By default we auto detect Windows (`WindowsBinding`), Linux (`LinuxBinding`) and OS X (`DarwinBinding`) and load the appropriate module for your system.
+   * The hardware access binding. `Bindings` are how Node-Serialport talks to the underlying system. If you're using the `serialport` package, this defaults to `'@serialport/bindings-cpp'` which auto detects Windows (`WindowsBinding`), Linux (`LinuxBinding`) and OS X (`DarwinBinding`) and load the appropriate module for your system.
    */
   binding: T
 
@@ -56,31 +67,16 @@ export interface OpenOptions<T extends BindingInterface> extends BindingOpenOpti
   endOnClose?: boolean
 }
 
-export class DisconnectedError extends Error {
-  disconnected: true
-  constructor(message: string) {
-    super(message)
-    this.disconnected = true
-  }
-}
-
 export class SerialPortStream<T extends BindingInterface = BindingInterface> extends Duplex {
   port?: PortInterfaceFromBinding<T>
   private _pool: PoolBuffer
   private _kMinPoolSpace: number
   opening: boolean
   closing: boolean
-  readonly settings: InternalSettings<T>
+  readonly settings: InternalSettings<T> & OpenOptionsFromBinding<T>
 
   /**
    * Create a new serial port object for the `path`. In the case of invalid arguments or invalid options, when constructing a new SerialPort it will throw an error. The port will open automatically by default, which is the equivalent of calling `port.open(openCallback)` in the next tick. You can disable this by setting the option `autoOpen` to `false`.
-   * @param {OpenOptions=} options - Port configuration options
-   * @param {ErrorCallback=} openCallback - If `autoOpen` is true (the default) it will be provided to `port.open()` and run after the port is opened. The callback will be ignored if `autoOpen` is set to `false`.
-   * @property {number} baudRate The port's baudRate. Use `.update` to change it. Read-only.
-   * @property {string} path The system path or name of the serial port. Read-only.
-   * @property {boolean} isOpen `true` if the port is open, `false` otherwise. Read-only.
-   * @property {InternalSettings} settings The current settings of the port
-   * @throws {TypeError} When given invalid arguments, a `TypeError` will be thrown.
    * @emits open
    * @emits data
    * @emits close

packages/terminal/lib/index.ts

@@ -30,7 +30,7 @@ const args = program.opts<{
   path?: string
   baud: number
   databits: 8 | 7 | 6 | 5
-  parity: string
+  parity: OpenOptions<AutoDetectTypes>['parity']
   stopbits: 1 | 1.5 | 2
   echo: boolean
   flowCtl?: string