---
title: "JavaScript source maps"
url: https://daily.dev/posts/javascript-source-maps-fx5gq2l1b
source_url: https://gleam.run/news/javascript-source-maps
type: article
source: "Gleam"
published: 2026-04-24T14:40:03.736Z
updated: 2026-04-24T14:40:27.747Z
tags: ["javascript", "compiler", "gleam"]
reading_time: 13
upvotes: 6
comments: 0
language: en
---

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# JavaScript source maps

**[Gleam](https://daily.dev/sources/gleam)** · 13 min read · 6 upvotes · 0 comments

## Summary

Gleam v1.16.0 has been released with several notable improvements. The headline feature is JavaScript source map support, enabling browsers and runtimes to map compiled JS back to original Gleam code for debugging, breakpoints, and stack traces. Other highlights include package-level fault tolerance in the compiler (so unrelated modules still compile when one fails), ~30% faster string pattern matching on the JavaScript target, new language server code actions (add/remove anonymous functions, extract function improvements, replace type holes), oversized int pattern warnings for JavaScript's 52-bit limit, constant list prepending, and improved tuple formatting.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://gleam.run/news/javascript-source-maps>

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---

Tags: [#javascript](https://daily.dev/tags/javascript), [#compiler](https://daily.dev/tags/compiler), [#gleam](https://daily.dev/tags/gleam)

[View this post on daily.dev](https://daily.dev/posts/javascript-source-maps-fx5gq2l1b)