noyobo / offset-sourcemap

Offset the line number of the source map

offset-sourcemap

Description

offset-sourcemap is a utility for offsetting the lines of a source map. This can be useful in various scenarios where you need to adjust the line numbers in a source map, such as when concatenating files or adding/removing lines of code.

Installation

You can install the package using npm or yarn:

npm install offset-sourcemap

or

yarn add offset-sourcemap

Usage

Here is an example of how to use the offsetSourceMap function:

import { offsetSourceMap } from "offset-sourcemap";
import MagicString from "magic-string";

const s = new MagicString("var a = 1,\nb=2");
const map = s
  .generateMap({ includeContent: true, source: "a.js", hires: "boundary" })
  .toString();
const offsetMap = offsetSourceMap(map, 2);

console.log(offsetMap);

API

offsetSourceMap(sourceMap: RawSourceMap | string, offset: number): RawSourceMap | string

Offsets the lines in the given source map by the specified number of lines.

• sourceMap: The source map to offset. Can be a RawSourceMap object or a JSON string.
• offset: The number of lines to offset the source map by.

Returns the offset source map, either as a RawSourceMap object or a JSON string, depending on the input type.

License

This project is licensed under the MIT License.