feat: drop Node 6 support (#169)

Node 6.x became maintenance LTS since 2018-04-30.
Stopping old Node support leads to less maintenance cost.
For details, see <https://github.com/nodejs/Release>.

BREAKING CHANGE:

Stop supporting Node 6.x which is maintenance LTS.

.babelrc.js

@@ -1,10 +1,7 @@
 module.exports = {
-  presets: [['@babel/preset-env', { targets: { node: '6' } }]],
-
-  plugins: ['@babel/plugin-proposal-object-rest-spread'],
-
   env: {
     test: {
+      presets: [['@babel/preset-env', { targets: { node: 'current' } }]],
       plugins: ['istanbul'],
     },
   },

.gitignore

@@ -57,9 +57,3 @@ typings/
 
 # dotenv environment variables file
 .env
-
-# @std/esm
-.esm-cache
-
-# build directory
-/lib/

.nvmrc

@@ -1 +1 @@
-node
+8

.travis.yml

@@ -3,7 +3,6 @@ language: node_js
 node_js:
   - 10
   - 8
-  - 6
 
 cache:
   yarn: true
@@ -12,9 +11,7 @@ cache:
 
 script:
   - commitlint-travis
-  - npm run build
   - npm test
-  - npm run test:coverage
 
 deploy:
   provider: npm
@@ -23,7 +20,7 @@ deploy:
   skip_cleanup: true
   on:
     tags: true
-    node: 6
+    node: 8
 
 notifications:
   email: false

bin/cli.js

@@ -1,4 +1,4 @@
 #!/usr/bin/env node
-const dir = require('../src/select-dir')
+const cli = require(`../lib/cli`)
 
-require(`../${dir}/cli`)() // eslint-disable-line import/no-dynamic-require
+cli()

index.js

@@ -1,6 +1,3 @@
-const dir = require('./src/select-dir')
-
-// eslint-disable-next-line import/no-dynamic-require
-const init = require(`./${dir}/init`)
+const init = require(`./lib/init`)
 
 module.exports = { init }

package.json

@@ -18,12 +18,11 @@
   "files": [
     "bin",
     "lib",
-    "src",
     "templates",
     ".editorconfig"
   ],
   "engines": {
-    "node": ">=6"
+    "node": ">=8"
   },
   "dependencies": {
     "@commitlint/cli": "^6.0.2",
@@ -37,12 +36,10 @@
     "markdownlint-cli": "^0.8.0",
     "npm-run-all": "^4.1.2",
     "prettier": "^1.10.2",
-    "semver": "^5.5.0",
     "standard-version": "^4.3.0",
     "yargs": "^11.0.0"
   },
   "devDependencies": {
-    "@babel/cli": "7.0.0-beta.47",
     "@babel/core": "7.0.0-beta.47",
     "@babel/preset-env": "7.0.0-beta.47",
     "@babel/register": "7.0.0-beta.47",
@@ -51,10 +48,9 @@
     "nyc": "11.8.0"
   },
   "scripts": {
-    "build": "babel src/ -d lib/",
-    "test": "nyc --check-coverage mocha",
-    "test:watch": "mocha --watch",
-    "test:coverage": "nyc report --reporter=text-lcov > coverage.lcov",
+    "test": "NODE_ENV=test nyc --check-coverage mocha",
+    "test:watch": "NODE_ENV=test mocha --watch",
+    "test:coverage": "NODE_ENV=test nyc report --reporter=text-lcov > coverage.lcov",
     "lint:js": "eslint --ignore-path .gitignore --ext .js,.jsx,.mjs .",
     "lint:js:fix": "npm run lint:js -- --fix",
     "lint:md": "markdownlint --ignore node_modules --ignore CHANGELOG.md \"**/*.md\"",
@@ -81,6 +77,8 @@
     ]
   },
   "browserslist": [
-    "> 5%"
+    "> 1%",
+    "not ie 11",
+    "not op_mini all"
   ]
 }

test/fixtures/package-empty_expected.json

@@ -3,7 +3,6 @@
     "test": "test",
     "test:watch": "test --watch",
     "test:coverage": "echo \"unsupported.\" && exit 1",
-    "build": "babel src/ -d lib/",
     "lint:js": "eslint --ignore-path .gitignore --ext .js,.jsx,.mjs .",
     "lint:js:fix": "npm run lint:js -- --fix",
     "lint:md": "markdownlint --ignore node_modules --ignore CHANGELOG.md \"**/*.md\"",

test/fixtures/package-normal_expected.json

@@ -4,7 +4,6 @@
     "lint:js": "eslint --ignore-path .gitignore --ext .js,.jsx,.mjs .",
     "test:watch": "abc --watch",
     "test:coverage": "echo \"unsupported.\" && exit 1",
-    "build": "babel src/ -d lib/",
     "lint:js:fix": "npm run lint:js -- --fix",
     "lint:md": "markdownlint --ignore node_modules --ignore CHANGELOG.md \"**/*.md\"",
     "lint": "npm-run-all --print-name --print-label --parallel lint:*",