feat(ts) introduce TypeScript

This is just the stepping stone towards the goal of eventually having
lib-jitsi-meet fully written in JS.

- introduce ts-loader for webpack
- webpack will continue generating the UMD bundle
- tsc will generate an ES6 module
- output all bundles to dist/

.eslintignore

 # The build artifacts of the lib-jiti-meet project.
 lib-jitsi-meet.*
+dist/
 
 # Third-party source code which we (1) do not want to modify or (2) try to
 # modify as little as possible.

.gitignore

 .DS_Store
 stats.json
 .vscode
+dist

package-lock.json

         "karma-webpack": "5.0.0",
         "process": "0.11.10",
         "string-replace-loader": "3.0.3",
+        "ts-loader": "9.2.5",
+        "typescript": "4.3.5",
         "webpack": "5.57.1",
         "webpack-bundle-analyzer": "4.4.2",
         "webpack-cli": "4.9.0"
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       "dev": true
     },
+    "node_modules/micromatch": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.4.tgz",
+      "integrity": "sha512-pRmzw/XUcwXGpD9aI9q/0XOwLNygjETJ8y0ao0wdqprrzDa4YnxLcz7fQRZr8voh8V10kGhABbNcHVk5wHgWwg==",
+      "dev": true,
+      "dependencies": {
+        "braces": "^3.0.1",
+        "picomatch": "^2.2.3"
+      },
+      "engines": {
+        "node": ">=8.6"
+      }
+    },
     "node_modules/mime": {
       "version": "2.5.2",
       "resolved": "https://registry.npmjs.org/mime/-/mime-2.5.2.tgz",
         "node": ">=6"
       }
     },
+    "node_modules/ts-loader": {
+      "version": "9.2.5",
+      "resolved": "https://registry.npmjs.org/ts-loader/-/ts-loader-9.2.5.tgz",
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+      "dev": true,
+      "dependencies": {
+        "chalk": "^4.1.0",
+        "enhanced-resolve": "^5.0.0",
+        "micromatch": "^4.0.0",
+        "semver": "^7.3.4"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "peerDependencies": {
+        "typescript": "*",
+        "webpack": "^5.0.0"
+      }
+    },
+    "node_modules/ts-loader/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
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+      "dev": true,
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
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+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
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+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
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+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/ts-loader/node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
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+      "dependencies": {
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+      "dev": true
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+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ts-loader/node_modules/semver": {
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+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
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+      "dev": true,
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/ts-loader/node_modules/supports-color": {
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+      "dev": true,
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/tsconfig-paths": {
       "version": "3.11.0",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.11.0.tgz",
         "node": ">= 0.6"
       }
     },
+    "node_modules/typescript": {
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=4.2.0"
+      }
+    },
     "node_modules/ua-parser-js": {
       "version": "0.7.21",
       "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-0.7.21.tgz",
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       "dev": true
     },
+    "micromatch": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.4.tgz",
+      "integrity": "sha512-pRmzw/XUcwXGpD9aI9q/0XOwLNygjETJ8y0ao0wdqprrzDa4YnxLcz7fQRZr8voh8V10kGhABbNcHVk5wHgWwg==",
+      "dev": true,
+      "requires": {
+        "braces": "^3.0.1",
+        "picomatch": "^2.2.3"
+      }
+    },
     "mime": {
       "version": "2.5.2",
       "resolved": "https://registry.npmjs.org/mime/-/mime-2.5.2.tgz",
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       "dev": true
     },
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+      "resolved": "https://registry.npmjs.org/ts-loader/-/ts-loader-9.2.5.tgz",
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+      "dev": true,
+      "requires": {
+        "chalk": "^4.1.0",
+        "enhanced-resolve": "^5.0.0",
+        "micromatch": "^4.0.0",
+        "semver": "^7.3.4"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
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+          "dev": true,
+          "requires": {
+            "color-convert": "^2.0.1"
+          }
+        },
+        "chalk": {
+          "version": "4.1.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+          "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
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+          "dev": true
+        },
+        "has-flag": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+          "dev": true
+        },
+        "semver": {
+          "version": "7.3.5",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
+          "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
+      }
+    },
     "tsconfig-paths": {
       "version": "3.11.0",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.11.0.tgz",
         "mime-types": "~2.1.24"
       }
     },
+    "typescript": {
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
+      "dev": true
+    },
     "ua-parser-js": {
       "version": "0.7.21",
       "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-0.7.21.tgz",

package.json

     "karma-webpack": "5.0.0",
     "process": "0.11.10",
     "string-replace-loader": "3.0.3",
+    "ts-loader": "9.2.5",
+    "typescript": "4.3.5",
     "webpack": "5.57.1",
     "webpack-bundle-analyzer": "4.4.2",
     "webpack-cli": "4.9.0"
   "scripts": {
     "lint": "eslint .",
     "lint-fix": "eslint . --fix",
-    "postinstall": "webpack",
+    "postinstall": "webpack && tsc",
     "test": "karma start karma.conf.js",
     "test-watch": "karma start karma.conf.js --no-single-run",
     "validate": "npm ls",
     "watch": "webpack --config webpack.config.js --watch --mode development"
   },
-  "main": "./index.js",
+  "browser": "dist/umd/lib-jitsi-meet.min.js",
+  "module": "dist/esm/JitsiMeetJS.js",
   "license": "Apache-2.0"
 }

tsconfig.json

+{
+  "compilerOptions": {
+    "target": "es6",
+    "module": "es6",
+    "declaration": false,
+    "sourceMap": true,
+    "allowJs": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "lib": [
+      "esnext",
+      "dom"
+    ],
+    "outDir": "dist/esm/",
+  },
+  "exclude": [
+    "doc",
+    "dist",
+    "**/*.spec.js",
+    "*.conf*.js",
+    "webpack*.js",
+    "lib-jitsi-meet.*.js",
+    "types"
+  ]
+}

webpack-shared-config.js

                         ]
                     ]
                 },
-                test: /\.js$/
+                test: /\.(js|ts)$/
+            }, {
+                exclude: /node_modules/,
+                test: /\.ts$/,
+                use: 'ts-loader'
             } ]
         },
         node: {

webpack.config.js

+const path = require('path');
 const process = require('process');
 
 const sharedConfig = require('./webpack-shared-config');
             output: Object.assign({}, config.output, {
                 library: 'JitsiMeetJS',
                 libraryTarget: 'umd',
-                path: process.cwd()
+                path: path.join(process.cwd(), 'dist', 'umd')
             })
         }),
         {
             mode,
             output: {
                 filename: 'lib-jitsi-meet.e2ee-worker.js',
-                path: process.cwd()
+                path: path.join(process.cwd(), 'dist', 'umd')
             },
             optimization: {
                 minimize: false