feat: add possibility to provide config via environment variables (#77)

* fix #76: reading options from environment

* Add information to README.md and fix for eslint

* Moved notice about env vars to another section of README.md

* chore: upgrade babel till 7.0.0

* chore: update other dependencies

* fix: reading default options from ENV variables

Author: vdakalov

.babelrc

@@ -1,19 +1,19 @@
-  {
+{
   "presets": [
-    ["env", {
-      "targets": {
-        "node": 6
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": 6
+        }
       }
-    }]
+    ],
+    "@babel/preset-flow"
   ],
   "plugins": [
-    "transform-object-rest-spread",
-    "transform-class-properties",
-    "transform-flow-strip-types",
-    ["transform-runtime", {
-      "helpers": false,
-      "polyfill": false,
-      "regenerator": true
-    }]
+    "@babel/plugin-proposal-object-rest-spread",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-transform-flow-strip-types",
+    ["@babel/plugin-proposal-optional-chaining", { "loose": false }]
   ]
 }

.flowconfig

@@ -40,3 +40,4 @@
 [options]
 esproposal.class_instance_fields=enable
 suppress_comment= \\(.\\|\n\\)*\\$FlowFixMe
+esproposal.optional_chaining=enable

.travis.yml

@@ -9,7 +9,6 @@ notifications:
   email: true
 node_js:
   - "10"
-  - "9"
   - "8"
 script:
   - yarn run test

README.md

@@ -64,7 +64,14 @@ const mongod = new MongodbMemoryServer({
   autoStart?: boolean, // by default true
 });
 ```
-
+Also you can use the environment variables for configure installation process
+```
+MONGOMS_DOWNLOAD_DIR=/path/to/mongodb/binaries
+MONGOMS_PLATFORM=linux
+MONGOMS_ARCH=x64
+MONGOMS_VERSION=3
+MONGOMS_DEBUG=1 # also available case-insensitive values: "on" "yes" "true"
+```
 ### Simple test with MongoClient
 
 Take a look at this [test file](https://github.com/nodkz/mongodb-memory-server/blob/master/src/__tests__/singleDB-test.js).

package.json

@@ -24,32 +24,35 @@
   },
   "homepage": "https://github.com/nodkz/mongodb-memory-server",
   "devDependencies": {
-    "babel-cli": "^6.26.0",
-    "babel-eslint": "^8.2.6",
-    "babel-jest": "^23.4.2",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-plugin-transform-flow-strip-types": "^6.22.0",
-    "babel-plugin-transform-object-rest-spread": "^6.26.0",
-    "babel-plugin-transform-runtime": "^6.23.0",
-    "babel-preset-env": "^1.7.0",
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-proposal-class-properties": "^7.0.0",
+    "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
+    "@babel/plugin-proposal-optional-chaining": "^7.0.0",
+    "@babel/plugin-transform-flow-strip-types": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "@babel/preset-flow": "^7.0.0",
+    "babel-core": "^7.0.0-bridge.0",
+    "babel-eslint": "^9.0.0",
+    "babel-jest": "^23.6.0",
     "cz-conventional-changelog": "^2.1.0",
-    "eslint": "^5.2.0",
-    "eslint-config-airbnb-base": "^13.0.0",
-    "eslint-config-prettier": "^2.9.0",
+    "eslint": "^5.5.0",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-config-prettier": "^3.0.1",
     "eslint-plugin-flowtype": "^2.50.0",
-    "eslint-plugin-import": "^2.12.0",
+    "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-prettier": "^2.6.2",
-    "flow-bin": "^0.77.0",
-    "jest": "^23.4.2",
-    "mongodb": "3.1.1",
+    "flow-bin": "^0.80.0",
+    "jest": "^23.6.0",
+    "mongodb": "3.1.4",
     "npm-run-all": "^4.1.3",
-    "prettier": "^1.14.0",
+    "prettier": "^1.14.2",
     "rimraf": "^2.6.2",
-    "semantic-release": "^15.9.3"
+    "semantic-release": "^15.9.15"
   },
   "dependencies": {
-    "babel-runtime": "^6.26.0",
-    "debug": "^3.1.0",
+    "@babel/runtime": "^7.0.0",
+    "debug": "^4.0.1",
     "decompress": "^4.2.0",
     "get-port": "^4.0.0",
     "getos": "^3.1.0",

src/util/MongoBinary.js

@@ -22,12 +22,19 @@ export default class MongoBinary {
   static cache: MongoBinaryCache = {};
 
   static async getPath(opts?: MongoBinaryOpts = {}): Promise<string> {
-    const {
-      downloadDir = path.resolve(os.homedir(), '.mongodb-binaries'),
-      platform = os.platform(),
-      arch = os.arch(),
-      version = 'latest',
-    } = opts;
+    const defaultOptions = {
+      downloadDir:
+        process.env?.MONGOMS_DOWNLOAD_DIR || path.resolve(os.homedir(), '.mongodb-binaries'),
+      platform: process.env?.MONGOMS_PLATFORM || os.platform(),
+      arch: process.env?.MONGOMS_ARCH || os.arch(),
+      version: process.env?.MONGOMS_VERSION || 'latest',
+      debug:
+        typeof process.env.MONGOMS_DEBUG === 'string'
+          ? ['1', 'on', 'yes', 'true'].indexOf(process.env.MONGOMS_DEBUG.toLowerCase()) !== -1
+          : false,
+    };
+
+    const { downloadDir, platform, arch, version } = Object.assign({}, defaultOptions, opts);
 
     let debug;
     if (opts.debug) {