Create package configuration system

.pkgcfg.yaml

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+scopes:
+  - null # without scopes, e.g. 'hello-world'
+  - scope-name # with 'scope-name' scope, e.g. '@scope-name/hello-world'

tools/pkgcfg/index.d.ts

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+export const scopes: ReadonlyArray<string | null>

tools/pkgcfg/index.js

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+'use strict'
+const path = require('path')
+const fs = require('fs')
+const yaml = require('js-yaml')
+const places = require('@tools/places')
+const basename = '.pkgcfg.yaml'
+const filename = path.resolve(places.project, basename)
+const text = fs.readFileSync(filename, { encoding: 'utf8' })
+const pkgcfg = yaml.safeLoad(text)
+Object.defineProperty(exports, '__esModule', { value: true })
+Object.assign(exports, pkgcfg)

tools/pkgcfg/package.json

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+{
+  "name": "@tools/pkgcfg",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "js-yaml": "^3.12.2",
+    "@tools/places": "../places",
+    "@types/js-yaml": "^3.12.0",
+    "@types/node": "^11.10.4"
+  }
+}

tools/pkgcfg/shrinkwrap.yaml

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+dependencies:
+  '@tools/places': 'link:../places'
+  '@types/js-yaml': 3.12.0
+  '@types/node': 11.10.4
+  js-yaml: 3.12.2
+packages:
+  /@types/js-yaml/3.12.0:
+    dev: false
+    resolution:
+      integrity: sha512-UGEe/6RsNAxgWdknhzFZbCxuYc5I7b/YEKlfKbo+76SM8CJzGs7XKCj7zyugXViRbKYpXhSXhCYVQZL5tmDbpQ==
+  /@types/node/11.10.4:
+    dev: false
+    resolution:
+      integrity: sha512-wa09itaLE8L705aXd8F80jnFpxz3Y1/KRHfKsYL2bPc0XF+wEWu8sR9n5bmeu8Ba1N9z2GRNzm/YdHcghLkLKg==
+  /argparse/1.0.10:
+    dependencies:
+      sprintf-js: 1.0.3
+    dev: false
+    resolution:
+      integrity: sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==
+  /esprima/4.0.1:
+    dev: false
+    engines:
+      node: '>=4'
+    hasBin: true
+    resolution:
+      integrity: sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==
+  /js-yaml/3.12.2:
+    dependencies:
+      argparse: 1.0.10
+      esprima: 4.0.1
+    dev: false
+    hasBin: true
+    resolution:
+      integrity: sha512-QHn/Lh/7HhZ/Twc7vJYQTkjuCa0kaCcDcjK5Zlk2rvnUpy7DxMJ23+Jc2dcyvltwQVg1nygAVlB2oRDFHoRS5Q==
+  /sprintf-js/1.0.3:
+    dev: false
+    resolution:
+      integrity: sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=
+registry: 'https://registry.npmjs.org/'
+shrinkwrapMinorVersion: 9
+shrinkwrapVersion: 3
+specifiers:
+  '@tools/places': ../places
+  '@types/js-yaml': ^3.12.0
+  '@types/node': ^11.10.4
+  js-yaml: ^3.12.2