Replace text in a given file.

npm install replace-in

It creates a read stream to read from the target file in chunks. Replace each request and write the results using write stream. A final report will be returned when the replacement is done.

options object contains:

• path: string file path
• request: array array of objects. Each object must have two properties:
  • regex for RegExp/String to be matched.
  • replace string replacement.
• encoding:? string read stream encoding (default: utf8)

The results is promise contains report: array An array of objects. Each element contains three keys:

• isChanged: Boolean search result.
• regex: string regex sent in the request.
• replace: string replacement sent in the request.

const replace = require("replace-in");

// let's create some phrases to replace it in our file.
const phrase1 = {
  // regex
  regex: /old/gi,
  // replace
  replace: "new",
};

// and we have to replace more.
const phrase1 = {
  // regex
  regex: "second",
  // replace
  replace: "third",
};

const report = await replace({
  path: "/path1/path2/fileName",
  request: [phrase1, phrase1],
});

// > report
// [
//   {
//     isChanged: true,
//     regex: /old/gi,
//     replace: "new",
//   },
//   {
//     isChanged: false, // not found so it wasn't changed
//     regex: "second",
//     replace: "third",
//   },
// ];

Or you can check specific phrase result:

const report = await replace({
  path: "/path1/path2/fileName",
  request: [phrase1, phrase1],
});

if (report[2].isChanged) {
  console.log("phrase1 was found and changed");
} else {
  console.log("phrase1 was not found in the file!");
}

test

• find-in - A tool, written in JS for Searching Text in Files.

• textics & textics-stream - counts lines, words, chars and spaces for a given string.

• packageSorter - Sorting packages for monorepos production.

• move-position - Moves element in given array form index-A to index-B.

This project is licensed under the MIT License