---
title: "source-map Breaking Changes on npm | Since.dev"
description: "What each source-map release removed, renamed or changed: 5 breaking changes in 2 versions on npm, each with its source."
canonical_url: https://since.dev/packages/npm/source-map
last_updated: 2026-07-20
---

# source-map breaking changes

Every breaking API change we have recorded in source-map on npm: 5 breaking changes in 2 versions. Below are its newest 2 versions, removals and renames first, each with its source.

Newest change July 20, 2026

## 0.8.0

1 breaking change, first published July 20, 2026.

- **Removed** `SourceMapConsumer.initialize`  

SourceMapConsumer.initialize was removed in source-map 0.8.0 [npmjs.com](https://www.npmjs.com/package/source-map/v/0.8.0)

## 0.8.0-beta.0

4 breaking changes, first published July 20, 2026.

- **Removed**  

The prebuilt dist/ bundle is no longer shipped. Code that loads files from dist/ must change. [github.com](https://github.com/mozilla/source-map/blob/v0.8.0/CHANGELOG.md)
- **Behavior changed**  

Browser detection for loading the WASM mappings file now works differently. Check code that depends on how WASM loads in browsers. [github.com](https://github.com/mozilla/source-map/blob/v0.8.0/CHANGELOG.md)
- **Behavior changed**  

Sourcemap URL handling now uses the WHATWG URL API, which may resolve some URLs differently. [github.com](https://github.com/mozilla/source-map/blob/v0.8.0/CHANGELOG.md)
- **Behavior changed**  

WASM loading detection now uses the package.json browser field. Check bundler setups that depend on the previous detection. [github.com](https://github.com/mozilla/source-map/blob/v0.8.0/CHANGELOG.md)

## Check your code

These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#api) reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.

## Put your code on continuous management.

Scan a public repository now, or give your agent one line.

### See how out of date your code is.

[Scan a repository](https://since.dev/scan.md). Any public GitHub repository. No sign-in.

### Tell your agent what changed since it was trained.

`claude mcp add --transport http since https://api.since.dev/mcp`

---

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