Create main.js

node_modules/dotenv/lib/main.js

@@ -0,0 +1,118 @@
+/* @flow */
+/*::
+
+type DotenvParseOptions = {
+  debug?: boolean
+}
+
+// keys and values from src
+type DotenvParseOutput = { [string]: string }
+
+type DotenvConfigOptions = {
+  path?: string, // path to .env file
+  encoding?: string, // encoding of .env file
+  debug?: string // turn on logging for debugging purposes
+}
+
+type DotenvConfigOutput = {
+  parsed?: DotenvParseOutput,
+  error?: Error
+}
+
+*/
+
+const fs = require('fs')
+const path = require('path')
+const os = require('os')
+
+function log (message /*: string */) {
+  console.log(`[dotenv][DEBUG] ${message}`)
+}
+
+const NEWLINE = '\n'
+const RE_INI_KEY_VAL = /^\s*([\w.-]+)\s*=\s*(.*)?\s*$/
+const RE_NEWLINES = /\\n/g
+const NEWLINES_MATCH = /\r\n|\n|\r/
+
+// Parses src into an Object
+function parse (src /*: string | Buffer */, options /*: ?DotenvParseOptions */) /*: DotenvParseOutput */ {
+  const debug = Boolean(options && options.debug)
+  const obj = {}
+
+  // convert Buffers before splitting into lines and processing
+  src.toString().split(NEWLINES_MATCH).forEach(function (line, idx) {
+    // matching "KEY' and 'VAL' in 'KEY=VAL'
+    const keyValueArr = line.match(RE_INI_KEY_VAL)
+    // matched?
+    if (keyValueArr != null) {
+      const key = keyValueArr[1]
+      // default undefined or missing values to empty string
+      let val = (keyValueArr[2] || '')
+      const end = val.length - 1
+      const isDoubleQuoted = val[0] === '"' && val[end] === '"'
+      const isSingleQuoted = val[0] === "'" && val[end] === "'"
+
+      // if single or double quoted, remove quotes
+      if (isSingleQuoted || isDoubleQuoted) {
+        val = val.substring(1, end)
+
+        // if double quoted, expand newlines
+        if (isDoubleQuoted) {
+          val = val.replace(RE_NEWLINES, NEWLINE)
+        }
+      } else {
+        // remove surrounding whitespace
+        val = val.trim()
+      }
+
+      obj[key] = val
+    } else if (debug) {
+      log(`did not match key and value when parsing line ${idx + 1}: ${line}`)
+    }
+  })
+
+  return obj
+}
+
+function resolveHome (envPath) {
+  return envPath[0] === '~' ? path.join(os.homedir(), envPath.slice(1)) : envPath
+}
+
+// Populates process.env from .env file
+function config (options /*: ?DotenvConfigOptions */) /*: DotenvConfigOutput */ {
+  let dotenvPath = path.resolve(process.cwd(), '.env')
+  let encoding /*: string */ = 'utf8'
+  let debug = false
+
+  if (options) {
+    if (options.path != null) {
+      dotenvPath = resolveHome(options.path)
+    }
+    if (options.encoding != null) {
+      encoding = options.encoding
+    }
+    if (options.debug != null) {
+      debug = true
+    }
+  }
+
+  try {
+    // specifying an encoding returns a string instead of a buffer
+    const parsed = parse(fs.readFileSync(dotenvPath, { encoding }), { debug })
+
+    Object.keys(parsed).forEach(function (key) {
+      if (!Object.prototype.hasOwnProperty.call(process.env, key)) {
+        process.env[key] = parsed[key]
+      } else if (debug) {
+        log(`"${key}" is already defined in \`process.env\` and will not be overwritten`)
+      }
+    })
+
+    return { parsed }
+  } catch (e) {
+    return { error: e }
+  }
+}
+
+module.exports.config = config
+module.exports.parse = parse