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magic-string

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magic-string

Modify strings, generate sourcemaps

  • 0.19.1
  • Source
  • npm
  • Socket score

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37M
increased by6.5%
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What is magic-string?

The magic-string package is a utility library designed for use in compilers and other tools that manipulate strings, particularly for source code transformations. It allows for efficient editing of string content, such as adding, replacing, and removing sections, while keeping track of original and modified positions. This is particularly useful for tasks like source map generation, code rewriting, and more.

What are magic-string's main functionalities?

Generate a source map

This feature demonstrates how to prepend and append content to a string and generate a source map for the transformation. It's useful for tracking changes between the original and transformed code.

const MagicString = require('magic-string');
let s = new MagicString('export var answer = 42;');
s.prepend('/* hello */\n').append('\n/* world */');
console.log(s.toString());
console.log(s.generateMap({ hires: true }));

Replace content

This feature shows how to replace a specific part of the string ('answer' with 'question'). It's particularly useful for code modifications where precise control over the text is needed.

const MagicString = require('magic-string');
let s = new MagicString('export var answer = 42;');
s.overwrite(12, 17, 'question');
console.log(s.toString());

Remove content

This feature illustrates how to remove a section of the string (the 'export ' part). It's useful for cleaning up or simplifying code by removing unnecessary parts.

const MagicString = require('magic-string');
let s = new MagicString('export var answer = 42;');
s.remove(0, 7);
console.log(s.toString());

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Package last updated on 09 May 2017

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