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babel-plugin-source-map-support - a Babel plugin which automatically makes stack traces source-map aware

$ npm install source-map-support --save
$ npm install babel-plugin-source-map-support --save-dev

$ cat test.js

import foo from 'foo';
import bar from 'bar';

foo(bar);

$ babel --plugins source-map-support test.js

import 'source-map-support/register';
import foo from 'foo';
import bar from 'bar';

foo(bar);

This is a Babel plugin which prepends the following statement to source files:

import 'source-map-support/register';

In conjunction with the source-map-support module, which must be installed separately, this statement hooks into the v8 stack-trace API to translate call sites in the transpiled code back to their corresponding locations in the original code.

Note: this only works in environments which support the v8 stack-trace API (e.g. Node.js and Chrome), though it's harmless in other environments.

The source-map-support module only needs to be registered in the top-level file(s) of an application, but it no-ops if it has already been loaded, so there's no harm in registering it in every file.

You probably don't want to use this plugin when compiling code for the web because you probably don't want to bundle source-maps and the source-map-support module in minified code. An easy way to limit the plugin's scope to development/test builds is to use Babel's env option, e.g.:

{
    env: {
        development: {
            sourceMaps: 'inline',
            plugins: ['source-map-support', ...]
        }
    },

    presets: [ ... ]
}

Note that source-maps don't need to be inlined in each file. They can be externalised by using the { sourceMaps: true } option. This adds a link to the bottom of each file which points to its generated source-map, e.g.:

{
    env: {
        development: {
            sourceMaps: true,
            plugins: ['source-map-support', ...]
        }
    },
}

// index.js footer:
//# sourceMappingURL=index.js.map

• Babel >= 7
• Maintained Node.js versions

• babel
• source-map-support

2.1.3

chocolateboy

Copyright © 2015-2020 by chocolateboy.

This module is free software; you can redistribute it and/or modify it under the terms of the Artistic License 2.0.