profiler-sourcemap-injector
v1.0.0
Published
Injects sourcemaps into .cpuprofile files
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Profiler sourcemap injector
This package injects source map files into .cpuprofile files generated by Chrome DevTools.
Installation
npm install profiler-sourcemap-injector
or
yarn add profiler-sourcemap-injector
Usage
import { injectSourceMaps } from 'profiler-sourcemap-injector';
const outputObject = await injectSourceMaps('path/to/profile.cpuprofile', 'path/to/output/profile.cpuprofile', {
sourceMapDir: 'path/to/source/maps', // Directory where source maps are located
sourceDir: 'path/to/source/files', // Optional path to source file directory
profileSourceRoot: 'root/of/profile/source/paths', // Optional root path of source paths in .cpuprofile file
log: (msg) => console.log(msg), // Optional logging function
transformSource: (path) => path, // Optional function to transform source paths
sourceMapProvider: (path) => null, // Optional function to provide source maps
});
.cpuprofile reading
You can specify JSON-parsed .cpuprofile object instead of file path.
Path resolution
If profileSourceRoot
is specified, the speicfied value will be removed from the start of each .cpuprofile path.
If sourceDir
is specified, the specified value will be appended to the start of each .cpuprofile path.
This is helpful if you want to forcefully resolve paths to use in e.g. VSCode
You can override that behavior by specifying transformSource
function. The function gets .cpuprofile path as an input, and outputs new path.
Source map reading
By default this package reads source maps from the sourceMapDir
, looking for files with the same name as .js, but with .map extension.
You can override that behavior by specifying sourceMapProvider
function. The function gets .cpuprofile path as an input, and outputs source map contents string.
Usage outside of NodeJS environment
To use this module outside of NodeJS you can override sourceMapProvider
function, provide profile object instead of .cpuprofile path, and specify null
to the output argument.
You can get resulting profile object from the return value of the function.
License
Contributions
PRs are very welcome!