+ test folder -> tests

+ babel build rework
+ preload result kept in global

Author: linhntaim

README.md

@@ -138,6 +138,95 @@ console.log(process.env.EXPONENTIAL)    // (string) 'false'
 console.log(process.env.NUMBER)         // (string) '100'
 ```
 
+## Preload
+
+You can use the `--require` (`-r`) [command line option](https://nodejs.org/api/cli.html#cli_r_require_module) 
+to preload dotenv & dotenv-conversion (and even dotenv-expand). 
+By doing this, you do not need to require and load dotenv or dotenv-conversion (or dotenv-expand)
+in your application code. 
+This is the preferred approach when using `import` instead of `require`.
+
+```bash
+# dotenv + dotenv-conversion
+$ node -r dotenv-conversion/config your_script.js
+
+# dotenv + dotenv-expand + dotenv-conversion
+$ node -r dotenv-conversion/config-expand your_script.js
+```
+
+The configuration options below are supported as command line arguments 
+in the format `dotenv_config_<option>=value`.
+
+```bash
+# dotenv + dotenv-conversion
+$ node -r dotenv-conversion/config your_script.js dotenv_config_path=/custom/path/to/your/env/vars
+
+# dotenv + dotenv-expand + dotenv-conversion
+$ node -r dotenv-conversion/config your_script.js dotenv_config_path=/custom/path/to/your/env/vars
+```
+
+Additionally, you can use environment variables to set configuration options. 
+Command line arguments will precede these.
+
+```bash
+# dotenv + dotenv-conversion
+$ DOTENV_CONFIG_<OPTION>=value node -r dotenv-conversion/config your_script.js
+
+# dotenv + dotenv-expand + dotenv-conversion
+$ DOTENV_CONFIG_<OPTION>=value node -r dotenv-conversion/config your_script.js
+```
+
+```bash
+# dotenv + dotenv-conversion
+$ DOTENV_CONFIG_ENCODING=latin1 node -r dotenv-conversion/config your_script.js dotenv_config_path=/custom/path/to/.env
+
+# dotenv + dotenv-expand + dotenv-conversion
+$ DOTENV_CONFIG_ENCODING=latin1 node -r dotenv-conversion/config your_script.js dotenv_config_path=/custom/path/to/.env
+```
+
+After preload, you can retrieve converted variables via `global.dotenvConversion.parsed`:
+
+```dotenv
+# .env file
+DEBUG_LEVEL=0
+DEBUG=boolean:$DEBUG_LEVEL
+
+EXPONENTIAL=2
+NUMBER=1e$EXPONENTIAL
+```
+
+```javascript
+// index.js file
+const parsedEnv = global.dotenvConversion.parsed
+console.log(parsedEnv.DEBUG_LEVEL)      // (number) 0 
+console.log(parsedEnv.DEBUG)            // (boolean) false
+console.log(parsedEnv.EXPONENTIAL)      // (boolean) 2
+console.log(parsedEnv.NUMBER)           // (boolean) 100
+console.log(process.env.DEBUG_LEVEL)    // (string) '0'
+console.log(process.env.DEBUG)          // (string) 'false'
+console.log(process.env.EXPONENTIAL)    // (string) 'false'
+console.log(process.env.NUMBER)         // (string) '100'
+```
+
+```bash
+# dotenv + dotenv-expand + dotenv-conversion
+$ node -r dotenv-conversion/config-expand index.js
+```
+
+Console output:
+
+```
+0
+false
+2
+100
+0
+false
+2
+100
+```
+
+
 ## Features
 
 ### Auto-Conversion

babel.config.json

@@ -4,8 +4,5 @@
     ],
     "plugins": [
         "add-module-exports"
-    ],
-    "comments": false,
-    "sourceMaps": true,
-    "minified": true
+    ]
 }

config-expand.js

@@ -10,5 +10,5 @@
         ),
     )
 
-    return dotenvConversion(dotenvExpand(env))
+    return global.dotenvConversion = dotenvConversion(dotenvExpand(env))
 })()

config.js

@@ -9,5 +9,5 @@
         ),
     )
 
-    return dotenvConversion(env)
+    return global.dotenvConversion = dotenvConversion(env)
 })()