Upgrade to Typescript (#50)

.babelrc

@@ -8,12 +8,12 @@
           "transform-regenerator"
         ]
       }
-    ]
+    ],
+    ["@babel/preset-typescript"]
   ],
   "plugins": [
-    "@babel/plugin-transform-flow-strip-types",
     [
-      "@babel/plugin-proposal-decorators", 
+      "@babel/plugin-proposal-decorators",
       {
         "decoratorsBeforeExport": false
       }

.eslintrc

@@ -1,28 +1,17 @@
 {
   "parser": "babel-eslint",
   "extends": [
-    "airbnb-base",
-    "plugin:flowtype/recommended"
-  ],
-  "plugins": [
-    "flowtype",
-    "flowtype-errors"
+    "airbnb-base"
   ],
   "env": {
     "node": true
   },
-  "settings": {
-    "flowtype": {
-      "onlyFilesWithFlowAnnotation": true
-    }
-  },
   "rules": {
     "arrow-parens": ["error", "always"],
     "max-len": ["error", 120],
     "no-duplicate-imports": "off",
     "no-restricted-syntax": "off",
     "generator-star-spacing": "off",
-    "import/no-extraneous-dependencies": ["error", {"peerDependencies": true}],
-    "flowtype-errors/show-errors": "error"
+    "import/no-extraneous-dependencies": ["error", {"peerDependencies": true}]
   }
 }

examples/debug-webpack4/webpack.config.js

@@ -1,8 +1,8 @@
 let config = {
   mode: process.env.NODE_ENV || 'development',
-  entry: './src/index.js',
+  entry: './lib/index.js',
   devServer: {
-    contentBase: './src'
+    contentBase: './lib'
   }
 };
 

package.json

@@ -17,10 +17,9 @@
   "scripts": {
     "clean-lib": "del-cli \"lib/**\" \"!lib\" \"!lib/reporters\" \"!lib/utils.js\" \"!lib/entry.js\" \"!lib/reporters/base.js\"",
     "clean-tmp": "del-cli \".tmp/**\"",
-    "build": "yarn run clean-lib && babel ./src -d lib --source-maps",
+    "build": "yarn run clean-lib && tsc",
     "lint": "eslint src test bin --fix",
-    "flow": "flow",
-    "test": "yarn run clean-tmp && yarn run build && mocha --timeout 10000 --recursive --require @babel/register \"test/**/*.test.js\"",
+    "test": "yarn run clean-tmp && yarn run build && ts-mocha --timeout 10000 --recursive --require @babel/register --exit \"test/**/*.test.ts\"",
     "cover": "cross-env BABEL_ENV=coverage nyc --reporter=lcov --reporter=text npm test",
     "posttest": "yarn run lint",
     "docs:clean": "del-cli _book",
@@ -31,7 +30,7 @@
     "prepublishOnly": "yarn run build  && yarn run docs:build",
     "postpublish": "yarn run docs:deploy",
     "release": "np",
-    "watch": "babel ./src -w -d lib"
+    "watch": "tsc -w"
   },
   "repository": {
     "type": "git",
@@ -56,11 +55,14 @@
     "@babel/plugin-proposal-class-properties": "^7.0.0",
     "@babel/plugin-proposal-decorators": "^7.0.0",
     "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
-    "@babel/plugin-transform-flow-strip-types": "^7.0.0",
     "@babel/plugin-transform-runtime": "^7.0.0",
     "@babel/preset-env": "^7.0.0",
-    "@babel/preset-flow": "^7.0.0",
+    "@babel/preset-typescript": "^7.7.4",
     "@babel/register": "^7.0.0",
+    "@babel/runtime": "^7.7.6",
+    "@types/lodash": "^4.14.149",
+    "@types/node": "^12.12.17",
+    "@types/webpack": "^4.41.0",
     "anymatch": "3.1.1",
     "babel-eslint": "^9.0.0",
     "babel-loader": "^8.0.0",
@@ -75,11 +77,7 @@
     "del-cli": "3.0.0",
     "eslint": "4.19.1",
     "eslint-config-airbnb-base": "12.1.0",
-    "eslint-plugin-flowtype": "4.3.0",
-    "eslint-plugin-flowtype-errors": "4.1.0",
     "eslint-plugin-import": "^2.9.0",
-    "fast-async": "^6.1.2",
-    "flow-bin": "^0.113.0",
     "fs-extra": "5.0.0",
     "gh-pages": "1.2.0",
     "gitbook-cli": "^2.3.2",
@@ -96,6 +94,8 @@
     "sinon": "7.5.0",
     "strip-ansi": "^5.2.0",
     "tiny-worker": "2.3.0",
+    "ts-mocha": "^6.0.0",
+    "typescript": "^3.7.3",
     "webpack": "4.41.0",
     "worker-loader": "2.0.0",
     "write-file-webpack-plugin": "^4.2.0"
@@ -130,11 +130,10 @@
     ]
   },
   "nyc": {
+    "extension": [".ts"],
     "include": [
-      "src/**/*.js"
-    ],
-    "sourceMap": false,
-    "instrument": false
+      "src/**/*.ts"
+    ]
   },
   "resolutions": {
     "js-yaml": ">=3.13.0",