npmpackage.info

Gathering detailed insights and metrics for source-map-loader

Other packages similar to source-map-loader

adjust-sourcemap-loader

5.0.0

Webpack loader that adjusts source maps

karma-sourcemap-loader

0.4.0

Karma plugin that locates and loads existing javascript source map files.

smart-source-map-loader

1.3.4

A Smart Source Map Loader for Webpack

source-map-loader-cli

0.0.1

extracts inlined source map and offers it to webpack

Gathering detailed insights and metrics for source-map-loader

source-map-loader - 5.0.0 | npmpackage.info

source-map-loader

extract sourceMappingURL comments from modules and offer it to webpack

5.0.0

373

MIT

JavaScript

35.05 kB

6.2

Installations

npm install source-map-loader

Developer Guide

BETA

Typescript

No

Module System

CommonJS

Min. Node Version

>= 18.12.0

Node Version

18.19.0

NPM Version

10.2.3 Pull Requests

Open

2

Total

183

Closed

39

Merged

142

Issues

Open

4

Total

70

Closed

66

Releases

v5.0.0

Updated on Jan 15, 2024

v4.0.2

Updated on Dec 27, 2023

v3.0.2

Updated on Oct 21, 2022

v4.0.1

Updated on Oct 07, 2022

v4.0.0

Updated on Jun 13, 2022

v3.0.1

Updated on Jan 03, 2022

View All 22 releases

Languages

JavaScript

JavaScript (100%)

Developer

webpack-contrib

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

MIT License

373 Stars

183 Commits

85 Forks

15 Watchers

2 Branches

42 Contributors

Updated on Jun 20, 2025

Sponsor this package

https://opencollective.com/webpack

Maintainers

View All 42 Contributors

Package Meta Information

Latest Version

5.0.0

Package Id

source-map-loader@5.0.0

Unpacked Size

35.05 kB

Size

10.48 kB

File Count

NPM Version

10.2.3

Node Version

18.19.0

Published on

Jan 15, 2024

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

NaN

Compared to previous day

Last Week

NaN

Compared to previous week

Last Month

NaN

Compared to previous month

Last Year

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

iconv-lite source-map-js

Peer Dependencies

webpack

Dev Dependencies

source-map-loader

Extracts source maps from existing source files (from their sourceMappingURL).

Getting Started

To begin, you'll need to install source-map-loader:

1npm i -D source-map-loader

1yarn add -D source-map-loader

1pnpm add -D source-map-loader

Then add the plugin to your webpack config. For example:

file.js

1import css from "file.css";

webpack.config.js

1module.exports = {
2  module: {
3    rules: [
4      {
5        test: /\.js$/,
6        enforce: "pre",
7        use: ["source-map-loader"],
8      },
9    ],
10  },
11};

The source-map-loader extracts existing source maps from all JavaScript entries. This includes both inline source maps as well as those linked via URL. All source map data is passed to webpack for processing as per a chosen source map style specified by the devtool option in webpack.config.js. This loader is especially useful when using 3rd-party libraries having their own source maps. If not extracted and processed into the source map of the webpack bundle, browsers may misinterpret source map data. source-map-loader allows webpack to maintain source map data continuity across libraries so ease of debugging is preserved. The source-map-loader will extract from any JavaScript file, including those in the node_modules directory. Be mindful in setting include and exclude rule conditions to maximize bundling performance.

And run webpack via your preferred method.

Options

Name	Type	Default	Description
`filterSourceMappingUrl`	`{Function}`	`undefined`	Allows to control `SourceMappingURL` behaviour

filterSourceMappingUrl

Type: Function Default: undefined

Allows you to specify the behavior of the loader for SourceMappingURL comment.

The function must return one of the values:

true or 'consume' - consume the source map and remove SourceMappingURL comment (default behavior)
false or 'remove' - do not consume the source map and remove SourceMappingURL comment
skip - do not consume the source map and do not remove SourceMappingURL comment

Example configuration:

webpack.config.js

1module.exports = {
2  module: {
3    rules: [
4      {
5        test: /\.js$/,
6        enforce: "pre",
7        use: [
8          {
9            loader: "source-map-loader",
10            options: {
11              filterSourceMappingUrl: (url, resourcePath) => {
12                if (/broker-source-map-url\.js$/i.test(url)) {
13                  return false;
14                }
15
16                if (/keep-source-mapping-url\.js$/i.test(resourcePath)) {
17                  return "skip";
18                }
19
20                return true;
21              },
22            },
23          },
24        ],
25      },
26    ],
27  },
28};

Examples

Ignoring Warnings

To ignore warnings, you can use the following configuration:

webpack.config.js

1module.exports = {
2  module: {
3    rules: [
4      {
5        test: /\.js$/,
6        enforce: "pre",
7        use: ["source-map-loader"],
8      },
9    ],
10  },
11  ignoreWarnings: [/Failed to parse source map/],
12};

More information about the ignoreWarnings option can be found here

Contributing

Please take a moment to read our contributing guidelines if you haven't yet done so.

CONTRIBUTING

License

MIT

No vulnerabilities found.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

10

Dangerous-Workflow

Determines if the project's GitHub Action workflows avoid dangerous patterns.

10

License

Determines if the project has defined a license.

10

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

7

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

4

Maintained

Determines if the project is "actively maintained".

4

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

0

SAST

Determines if the project uses static code analysis.

Score

6.2

/10

Last Scanned on 2025-07-07

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.

Learn More