Migrate to TypeScript

.editorconfig

@@ -0,0 +1,14 @@
+# http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+indent_size = 4
+trim_trailing_whitespace = false

.eslintignore

@@ -0,0 +1,4 @@
+*.js
+node_modules
+dist
+coverage

.eslintrc.js

@@ -0,0 +1,169 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+    'jest',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+  env: {
+    node: true,
+    'jest/globals': true
+  },
+  rules: {
+    "accessor-pairs": 2,
+    "arrow-spacing": [2, { "before": true, "after": true }],
+    "block-spacing": [2, "always"],
+    "brace-style": 0,
+    "camelcase": [2, { "properties": "never", "allow": ["^UNSAFE_"] }],
+    "comma-dangle": [2, "always-multiline"],
+    "comma-spacing": [2, { "before": false, "after": true }],
+    "comma-style": [2, "last"],
+    "constructor-super": 2,
+    "curly": 2,
+    "default-case": 2,
+    "dot-location": [2, "property"],
+    "eol-last": 2,
+    "eqeqeq": [2, "allow-null"],
+    "generator-star-spacing": [2, { "before": true, "after": true }],
+    "handle-callback-err": [2, "^(err|error)$" ],
+    "indent": 0,
+    "jsx-quotes": [2, "prefer-double"],
+    "key-spacing": 2,
+    "keyword-spacing": [2, { "before": true, "after": true }],
+    "new-cap": [2, { "newIsCap": true, "capIsNew": false }],
+    "new-parens": 2,
+    "no-array-constructor": 0,
+    "no-async-promise-executor": "error",
+    "no-caller": 2,
+    "no-class-assign": 2,
+    "no-cond-assign": 2,
+    "no-confusing-arrow": 2,
+    "no-const-assign": 2,
+    "no-control-regex": 2,
+    "no-debugger": 2,
+    "no-delete-var": 2,
+    "no-dupe-args": 2,
+    "no-dupe-class-members": 2,
+    "no-dupe-keys": 2,
+    "no-duplicate-case": 2,
+    "no-duplicate-imports": 2,
+    "no-empty-character-class": 2,
+    "no-empty-pattern": 2,
+    "no-eval": 2,
+    "no-ex-assign": 2,
+    "no-extend-native": 2,
+    "no-extra-bind": 2,
+    "no-extra-boolean-cast": 2,
+    "no-extra-parens": [2, "functions"],
+    "no-fallthrough": 2,
+    "no-floating-decimal": 2,
+    "no-func-assign": 2,
+    "no-implied-eval": 2,
+    "no-inner-declarations": [2, "functions"],
+    "no-invalid-regexp": 2,
+    "no-irregular-whitespace": 2,
+    "no-iterator": 2,
+    "no-label-var": 2,
+    "no-labels": [2, { "allowLoop": false, "allowSwitch": false }],
+    "no-lone-blocks": 2,
+    "no-mixed-spaces-and-tabs": 2,
+    "no-multi-spaces": 2,
+    "no-multi-str": 2,
+    "no-multiple-empty-lines": [2, { "max": 2 }],
+    "no-native-reassign": 2,
+    "no-negated-in-lhs": 2,
+    "no-new": 2,
+    "no-new-func": 2,
+    "no-new-object": 2,
+    "no-new-require": 2,
+    "no-new-symbol": 2,
+    "no-new-wrappers": 2,
+    "no-obj-calls": 2,
+    "no-octal": 2,
+    "no-octal-escape": 2,
+    "no-path-concat": 2,
+    "no-proto": 2,
+    "no-redeclare": 2,
+    "no-regex-spaces": 2,
+    "no-return-assign": [2, "except-parens"],
+    "no-self-assign": 2,
+    "no-self-compare": 2,
+    "no-sequences": 2,
+    "no-shadow-restricted-names": 2,
+    "no-spaced-func": 2,
+    "no-sparse-arrays": 2,
+    "no-this-before-super": 2,
+    "no-throw-literal": 2,
+    "no-trailing-spaces": 2,
+    "no-undef": 2,
+    "no-undef-init": 2,
+    "no-unexpected-multiline": 2,
+    "no-unmodified-loop-condition": 2,
+    "no-unneeded-ternary": [2, { "defaultAssignment": false }],
+    "no-unreachable": 2,
+    "no-unsafe-finally": 2,
+    "no-unused-expressions": 0,
+    "no-unused-vars": 0,
+    "no-use-before-define": 0,
+    "no-useless-call": 2,
+    "no-useless-computed-key": 2,
+
+    "no-useless-escape": 2,
+    "no-var": 2,
+    "no-whitespace-before-property": 2,
+    "no-with": 2,
+    "object-curly-spacing": [2, "always"],
+    "one-var": [2, { "initialized": "never" }],
+    "operator-linebreak": [2, "after", { "overrides": { "?": "ignore", ":": "ignore" } }],
+    "padded-blocks": "off",
+    "prefer-const": 2,
+    "quotes": 0,
+    "semi": 0,
+    "semi-spacing": [2, { "before": false, "after": true }],
+    "space-before-blocks": [2, "always"],
+    "space-before-function-paren": 0,
+    "space-in-parens": [2, "never"],
+    "space-infix-ops": 2,
+    "space-unary-ops": [2, { "words": true, "nonwords": false }],
+    "spaced-comment": [2, "always", { "markers": ["global", "globals", "eslint", "eslint-disable", "*package", "!", ","], "exceptions": ["=", "-"] } ],
+    "template-curly-spacing": [2, "never"],
+    "use-isnan": 2,
+    "valid-typeof": 2,
+    "wrap-iife": [2, "any"],
+    "yield-star-spacing": [2, "both"],
+    "yoda": [2, "never"],
+
+    '@typescript-eslint/array-type': 2,
+    "@typescript-eslint/consistent-type-definitions": [2, "type"],
+    '@typescript-eslint/no-explicit-any': 0,
+    '@typescript-eslint/prefer-for-of': 0,
+    '@typescript-eslint/prefer-function-type': 2,
+    '@typescript-eslint/prefer-optional-chain': 2,
+    '@typescript-eslint/triple-slash-reference': 2,
+    '@typescript-eslint/type-annotation-spacing': 2,
+    '@typescript-eslint/typedef': 0,
+    '@typescript-eslint/unified-signatures': 2,
+
+    "@typescript-eslint/brace-style": 2,
+    '@typescript-eslint/default-param-last': 2,
+    '@typescript-eslint/func-call-spacing': 2,
+    "@typescript-eslint/indent": [2, 2,{ "SwitchCase": 1 }],
+    '@typescript-eslint/no-array-constructor': 2,
+    '@typescript-eslint/no-empty-function': 2,
+    '@typescript-eslint/no-extra-parens': 0,
+    '@typescript-eslint/no-extra-semi': 2,
+    '@typescript-eslint/no-magic-numbers': 0,
+    "@typescript-eslint/no-unused-expressions": [2, { "allowShortCircuit" : true, "allowTernary": true }],
+    "@typescript-eslint/no-unused-vars": [2, { "vars": "all", "args": "all", "argsIgnorePattern": "[_]+" }],
+    "@typescript-eslint/no-use-before-define": [2, { "functions": false }],
+    "@typescript-eslint/no-useless-constructor": 2,
+    "@typescript-eslint/quotes": [2, "single", {"avoidEscape": true, "allowTemplateLiterals": true}],
+    '@typescript-eslint/semi': [2, "always"],
+    "@typescript-eslint/space-before-function-paren": [2, "always"],
+  }
+};

.gitattributes

@@ -0,0 +1,6 @@
+* text=auto
+
+# Reviewing the lockfile contents is an important step in verifying that
+# we're using the dependencies we expect to be using
+package-lock.json linguist-generated=false
+yarn.lock linguist-generated=false

.gitignore

@@ -1,7 +1,7 @@
+*.js
+*.d.ts
+*.map
 
-# Created by https://www.gitignore.io/api/osx,node
-
-### Node ###
 # Logs
 logs
 *.log
@@ -24,21 +24,8 @@ coverage
 # nyc test coverage
 .nyc_output
 
-# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (https://nodejs.org/api/addons.html)
-build/Release
-
 # Dependency directories
 node_modules/
-jspm_packages/
 
 # TypeScript v1 declaration files
 typings/

.npmignore

@@ -0,0 +1,9 @@
+.idea
+.editorconfig
+.eslintignore
+.eslintrc.js
+.gitattributes
+*.tgz
+*.ts
+!*.d.ts
+tsconfig.json

README.md

@@ -7,7 +7,7 @@ API is the same as `EventEmitter`.
 ### usage
 
 ```js
-const SafeEventEmitter = require('safe-event-emitter')
+import SafeEventEmitter from 'safe-event-emitter'
 
 const ee = new SafeEventEmitter()
 ee.on('boom', () => { throw new Error() })