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Frontend-Learner/node_modules/replace-in-file/lib/helpers/replace-async.js

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+'use strict';
+
+/**
+ * Dependencies
+ */
+const fs = require('fs');
+const makeReplacements = require('./make-replacements');
+
+/**
+ * Helper to replace in a single file (async)
+ */
+module.exports = function replaceAsync(file, from, to, config) {
+
+  //Extract relevant config
+  const {encoding, dry, countMatches} = config;
+
+  //Wrap in promise
+  return new Promise((resolve, reject) => {
+    fs.readFile(file, encoding, (error, contents) => {
+      //istanbul ignore if
+      if (error) {
+        return reject(error);
+      }
+
+      //Make replacements
+      const [result, newContents] = makeReplacements(
+        contents, from, to, file, countMatches
+      );
+
+      //Not changed or dry run?
+      if (!result.hasChanged || dry) {
+        return resolve(result);
+      }
+
+      //Write to file
+      fs.writeFile(file, newContents, encoding, error => {
+        //istanbul ignore if
+        if (error) {
+          return reject(error);
+        }
+        resolve(result);
+      });
+    });
+  });
+};