
Research
NPM targeted by malware campaign mimicking familiar library names
Socket uncovered npm malware campaign mimicking popular Node.js libraries and packages from other ecosystems; packages steal data and execute remote code.
@esbuild/android-x64
Advanced tools
This is a WebAssembly shim for esbuild on Android x64. See https://github.com/evanw/esbuild for details.
0.25.3
Fix lowered async
arrow functions before super()
(#4141, #4142)
This change makes it possible to call an async
arrow function in a constructor before calling super()
when targeting environments without async
support, as long as the function body doesn't reference this
. Here's an example (notice the change from this
to null
):
// Original code
class Foo extends Object {
constructor() {
(async () => await foo())()
super()
}
}
// Old output (with --target=es2016)
class Foo extends Object {
constructor() {
(() => __async(this, null, function* () {
return yield foo();
}))();
super();
}
}
// New output (with --target=es2016)
class Foo extends Object {
constructor() {
(() => __async(null, null, function* () {
return yield foo();
}))();
super();
}
}
Some background: Arrow functions with the async
keyword are transformed into generator functions for older language targets such as --target=es2016
. Since arrow functions capture this
, the generated code forwards this
into the body of the generator function. However, JavaScript class syntax forbids using this
in a constructor before calling super()
, and this forwarding was problematic since previously happened even when the function body doesn't use this
. Starting with this release, esbuild will now only forward this
if it's used within the function body.
This fix was contributed by @magic-akari.
Fix memory leak with --watch=true
(#4131, #4132)
This release fixes a memory leak with esbuild when --watch=true
is used instead of --watch
. Previously using --watch=true
caused esbuild to continue to use more and more memory for every rebuild, but --watch=true
should now behave like --watch
and not leak memory.
This bug happened because esbuild disables the garbage collector when it's not run as a long-lived process for extra speed, but esbuild's checks for which arguments cause esbuild to be a long-lived process weren't updated for the new --watch=true
style of boolean command-line flags. This has been an issue since this boolean flag syntax was added in version 0.14.24 in 2022. These checks are unfortunately separate from the regular argument parser because of how esbuild's internals are organized (the command-line interface is exposed as a separate Go API so you can build your own custom esbuild CLI).
This fix was contributed by @mxschmitt.
More concise output for repeated legal comments (#4139)
Some libraries have many files and also use the same legal comment text in all files. Previously esbuild would copy each legal comment to the output file. Starting with this release, legal comments duplicated across separate files will now be grouped in the output file by unique comment content.
Allow a custom host with the development server (#4110)
With this release, you can now use a custom non-IP host
with esbuild's local development server (either with --serve=
for the CLI or with the serve()
call for the API). This was previously possible, but was intentionally broken in version 0.25.0 to fix a security issue. This change adds the functionality back except that it's now opt-in and only for a single domain name that you provide.
For example, if you add a mapping in your /etc/hosts
file from local.example.com
to 127.0.0.1
and then use esbuild --serve=local.example.com:8000
, you will now be able to visit http://local.example.com:8000/ in your browser and successfully connect to esbuild's development server (doing that would previously have been blocked by the browser). This should also work with HTTPS if it's enabled (see esbuild's documentation for how to do that).
Add a limit to CSS nesting expansion (#4114)
With this release, esbuild will now fail with an error if there is too much CSS nesting expansion. This can happen when nested CSS is converted to CSS without nesting for older browsers as expanding CSS nesting is inherently exponential due to the resulting combinatorial explosion. The expansion limit is currently hard-coded and cannot be changed, but is extremely unlikely to trigger for real code. It exists to prevent esbuild from using too much time and/or memory. Here's an example:
a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{color:red}}}}}}}}}}}}}}}}}}}}
Previously, transforming this file with --target=safari1
took 5 seconds and generated 40mb of CSS. Trying to do that will now generate the following error instead:
✘ [ERROR] CSS nesting is causing too much expansion
example.css:1:60:
1 │ a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{a,b{color:red}}}}}}}}}}}}}}}}}}}}
╵ ^
CSS nesting expansion was terminated because a rule was generated with 65536 selectors. This limit
exists to prevent esbuild from using too much time and/or memory. Please change your CSS to use
fewer levels of nesting.
Fix path resolution edge case (#4144)
This fixes an edge case where esbuild's path resolution algorithm could deviate from node's path resolution algorithm. It involves a confusing situation where a directory shares the same file name as a file (but without the file extension). See the linked issue for specific details. This appears to be a case where esbuild is correctly following node's published resolution algorithm but where node itself is doing something different. Specifically the step LOAD_AS_FILE
appears to be skipped when the input ends with ..
. This release changes esbuild's behavior for this edge case to match node's behavior.
Update Go from 1.23.7 to 1.23.8 (#4133, #4134)
This should have no effect on existing code as this version change does not change Go's operating system support. It may remove certain reports from vulnerability scanners that detect which version of the Go compiler esbuild uses, such as for CVE-2025-22871.
As a reminder, esbuild's development server is intended for development, not for production, so I do not consider most networking-related vulnerabilities in Go to be vulnerabilities in esbuild. Please do not use esbuild's development server in production.
FAQs
A WebAssembly shim for esbuild on Android x64.
The npm package @esbuild/android-x64 receives a total of 5,933,438 weekly downloads. As such, @esbuild/android-x64 popularity was classified as popular.
We found that @esbuild/android-x64 demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Research
Socket uncovered npm malware campaign mimicking popular Node.js libraries and packages from other ecosystems; packages steal data and execute remote code.
Research
Socket's research uncovers three dangerous Go modules that contain obfuscated disk-wiping malware, threatening complete data loss.
Research
Socket uncovers malicious packages on PyPI using Gmail's SMTP protocol for command and control (C2) to exfiltrate data and execute commands.