TypeScript support (definition files) + a few small enhancement proposals (#5)

* add typescript definition files for this JS API

* server.js: replace console.log by debug() call

* server.js: set "iface" and "port" properties on SRTServer listen call
+ and init them with null in constructor

* stream.js: SRTReadStream: init fd property with null in constructor

* stream.js: SRTReadStream: add close method (to free the fd aquired with
connect()), likewise the writable stream methods

* example files: add "use strict"; directive on all

* examples/srt.js: correctly state variable fhandle (this would crash in strict mode
otherwise)

* NAPI: NodeSRT::GetSockOpt: fix error handling to really reach ThrowAsJavaScriptException

* add example: srt.ts (TypeScript usage)

* add .editoconfig to project root (helps keeping files free of whitespaces
and maintain indentation etc)

* package.json: improve metadata quality (via npm init call)

* package.json: add dev-deps for tsc/ts-node and node type-defs

* package.json: add check-tsc script to compile typescript example

* gitignore: add tsc-lib (typescript compiler test output)

* add tsconfig.json (typescript compiler config)

* some end-of-file newline and whitespace fixes

* stream.js: add const decls for all the magic numbers in SRTReadStream

* enable eslint static analysis to find possible issues upfront
+ and maintain codestyle

* update package-lock

* stream.js: fix whitespace and eof

* add lint script for src, examples and types modules

* types: lint error fix

examples/client.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const fs = require('fs');
 const { SRTWriteStream } = require('../index.js');
 
@@ -8,9 +10,9 @@ srt.connect(writeStream => {
 });
 srt.on('error', err => {
   console.error(err.message);
-})
+});
 
 process.on('SIGINT', () => {
   console.log("Closing connection");
   srt.close();
-});
+});

examples/epoll.js

@@ -1,10 +1,12 @@
+"use strict";
+
 const { SRT } = require('../index.js');
 
 const srt = new SRT();
 const socket = srt.createSocket();
 if (socket !== -1) {
   console.log("Created socket: " + socket);
-} 
+}
 
 let result;
 
@@ -41,7 +43,7 @@ while (true) {
     } else {
       while (true) {
         const chunk = srt.read(event.socket, 1316);
-        console.log("Read chunk: " + chunk.length);      
+        console.log("Read chunk: " + chunk.length);
       }
     }
   });

examples/readable.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const fs = require('fs');
 const dest = fs.createWriteStream('./output');
 const { SRTReadStream } = require('../index.js');
@@ -17,4 +19,4 @@ if (process.argv[2] === "listener") {
   srt.connect(readStream => {
     readStream.pipe(dest);
   });
-}
+}

examples/server.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const fs = require('fs');
 const { SRTReadStream } = require('../index.js');
 

examples/srt.js

@@ -1,10 +1,12 @@
+"use strict";
+
 const { SRT } = require('../index.js');
 
 const srt = new SRT();
 const socket = srt.createSocket();
 if (socket !== -1) {
   console.log("Created socket: " + socket);
-} 
+}
 
 let result;
 result = srt.bind(socket, "0.0.0.0", 1234);
@@ -22,10 +24,10 @@ if (!result) {
 }
 
 console.log("Waiting for client to connect");
-fhandle = srt.accept(socket);
+const fhandle = srt.accept(socket);
 
 if (fhandle) {
   console.log("Client connected");
   const chunk = srt.read(fhandle, 1316);
   console.log("Read chunk: " + chunk.length);
-}
+}

examples/srt.ts

@@ -0,0 +1,31 @@
+import {SRT} from '../index';
+
+const srt = new SRT();
+const socket = srt.createSocket();
+if (socket !== -1) {
+  console.log("Created socket: " + socket);
+}
+
+let result;
+result = srt.bind(socket, "0.0.0.0", 1234);
+if (!result) {
+  console.log("Bind success");
+} else {
+  console.log(result);
+}
+
+result = srt.listen(socket, 2);
+if (!result) {
+  console.log("Listen success");
+} else {
+  console.log(result);
+}
+
+console.log("Waiting for client to connect");
+const fhandle = srt.accept(socket);
+
+if (fhandle) {
+  console.log("Client connected");
+  const chunk = srt.read(fhandle, 1316);
+  console.log("Read chunk: " + chunk.length);
+}

examples/writable.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const fs = require('fs');
 const source = fs.createReadStream(process.argv[2], { highWaterMark: 1316 });
 const { SRTWriteStream } = require('../index.js');
@@ -5,4 +7,4 @@ const { SRTWriteStream } = require('../index.js');
 const srt = new SRTWriteStream('127.0.0.1', 1234);
 srt.connect(writeStream => {
   source.pipe(writeStream);
-});
+});