(fix) create key flow

node_modules/loose-envify/replace.js

@@ -0,0 +1,65 @@
+'use strict';
+
+var jsTokens = require('js-tokens').default;
+
+var processEnvRe = /\bprocess\.env\.[_$a-zA-Z][$\w]+\b/;
+var spaceOrCommentRe = /^(?:\s|\/[/*])/;
+
+function replace(src, envs) {
+  if (!processEnvRe.test(src)) {
+    return src;
+  }
+
+  var out = [];
+  var purge = envs.some(function(env) {
+    return env._ && env._.indexOf('purge') !== -1;
+  });
+
+  jsTokens.lastIndex = 0
+  var parts = src.match(jsTokens);
+
+  for (var i = 0; i < parts.length; i++) {
+    if (parts[i    ] === 'process' &&
+        parts[i + 1] === '.' &&
+        parts[i + 2] === 'env' &&
+        parts[i + 3] === '.') {
+      var prevCodeToken = getAdjacentCodeToken(-1, parts, i);
+      var nextCodeToken = getAdjacentCodeToken(1, parts, i + 4);
+      var replacement = getReplacementString(envs, parts[i + 4], purge);
+      if (prevCodeToken !== '.' &&
+          nextCodeToken !== '.' &&
+          nextCodeToken !== '=' &&
+          typeof replacement === 'string') {
+        out.push(replacement);
+        i += 4;
+        continue;
+      }
+    }
+    out.push(parts[i]);
+  }
+
+  return out.join('');
+}
+
+function getAdjacentCodeToken(dir, parts, i) {
+  while (true) {
+    var part = parts[i += dir];
+    if (!spaceOrCommentRe.test(part)) {
+      return part;
+    }
+  }
+}
+
+function getReplacementString(envs, name, purge) {
+  for (var j = 0; j < envs.length; j++) {
+    var env = envs[j];
+    if (typeof env[name] !== 'undefined') {
+      return JSON.stringify(env[name]);
+    }
+  }
+  if (purge) {
+    return 'undefined';
+  }
+}
+
+module.exports = replace;