@jridgewell/build-mapping

Build source and source maps

Allows you to iteratively build source code and source maps from previously generated code/maps.

Installation

1npm install @jridgewell/build-mapping

Usage

1import { build, unnormalizedBuild } from '@jridgewell/build-mapping';
2
3const input = transformFileSync('input.js')
4const { code, map } = build`foo ${input} bar`;
5
6assert.equal(code, `foo [input's code here…] bar`);
7assert.deepEqual(map, {
8  version: 3,
9  sections: [
10    { offset: { line: 0, column: 4 }, map: … },
11    { offset: { line: 0, column: 24 }, map: … },
12  ]
13});
14
15
16// If you're using @jridgewell/trace-mapping's `AnyMap`, you can use a faster unnormalized builder:
17const { code: sameCode, map: unnormalized } = unnormalizedBuild`foo ${input} bar`;
18
19
20
21// This can be anything that generates { code, map }.
22function transformFileSync(file: string): { code: string, map: string } {
23  return babel.transformFileSync('input.js');
24}