chore(deps): update dependency esbuild to v0.14.38 #69
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This PR contains the following updates:
0.14.29
->0.14.38
Release Notes
evanw/esbuild
v0.14.38
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Further fixes to TypeScript 4.7 instantiation expression parsing (#2201)
This release fixes some additional edge cases with parsing instantiation expressions from the upcoming version 4.7 of TypeScript. Previously it was allowed for an instantiation expression to precede a binary operator but with this release, that's no longer allowed. This was sometimes valid in the TypeScript 4.7 beta but is no longer allowed in the latest version of TypeScript 4.7. Fixing this also fixed a regression that was introduced by the previous release of esbuild:
a<b> == c<d>
a == c
a == c
a == c
a<b> in c<d>
a in c
a<b>>=c<d>
a >= c
a<b>=c<d>
a < b >= c
a = c
a < b >= c
a = c
a = c
a<b>>c<d>
a < b >> c
a < b >> c
a < b >> c
a < b >> c
a > c
a < b >> c
This table illustrates some of the more significant changes between all of these parsers. The most important part is that esbuild 0.14.38 now matches the behavior of the latest TypeScript compiler for all of these cases.
v0.14.37
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Add support for TypeScript's
moduleSuffixes
field from TypeScript 4.7The upcoming version of TypeScript adds the
moduleSuffixes
field totsconfig.json
that introduces more rules to import path resolution. SettingmoduleSuffixes
to[".ios", ".native", ""]
will try to look at the the relative files./foo.ios.ts
,./foo.native.ts
, and finally./foo.ts
for an import path of./foo
. Note that the empty string""
inmoduleSuffixes
is necessary for TypeScript to also look-up./foo.ts
. This was announced in the TypeScript 4.7 beta blog post.Match the new ASI behavior from TypeScript nightly builds (#2188)
This release updates esbuild to match some very recent behavior changes in the TypeScript parser regarding automatic semicolon insertion. For more information, see TypeScript issues #48711 and #48654 (I'm not linking to them directly to avoid Dependabot linkback spam on these issues due to esbuild's popularity). The result is that the following TypeScript code is now considered valid TypeScript syntax:
This fix was contributed by @g-plane.
v0.14.36
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Revert path metadata validation for now (#2177)
This release reverts the path metadata validation that was introduced in the previous release. This validation has uncovered a potential issue with how esbuild handles
onResolve
callbacks in plugins that will need to be fixed before path metadata validation is re-enabled.v0.14.35
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Add support for parsing
typeof
on #private fields from TypeScript 4.7 (#2174)The upcoming version of TypeScript now lets you use
#private
fields intypeof
type expressions:https://devblogs.microsoft.com/typescript/announcing-typescript-4-7-beta/#typeof-on-private-fields
With this release, esbuild can now parse these new type expressions as well. This feature was contributed by @magic-akari.
Add Opera and IE to internal CSS feature support matrix (#2170)
Version 0.14.18 of esbuild added Opera and IE as available target environments, and added them to the internal JS feature support matrix. CSS feature support was overlooked, however. This release adds knowledge of Opera and IE to esbuild's internal CSS feature support matrix:
The fix for this issue was contributed by @sapphi-red.
Change TypeScript class field behavior when targeting ES2022
TypeScript 4.3 introduced a breaking change where class field behavior changes from assign semantics to define semantics when the
target
setting intsconfig.json
is set toESNext
. Specifically, the default value for TypeScript'suseDefineForClassFields
setting when unspecified istrue
if and only iftarget
isESNext
. TypeScript 4.6 introduced another change where this behavior now happens for bothESNext
andES2022
. Presumably this will be the case forES2023
and up as well. With this release, esbuild's behavior has also been changed to match. Now configuring esbuild with--target=es2022
will also cause TypeScript files to use the new class field behavior.Validate that path metadata returned by plugins is consistent
The plugin API assumes that all metadata for the same path returned by a plugin's
onResolve
callback is consistent. Previously this assumption was just assumed without any enforcement. Starting with this release, esbuild will now enforce this by generating a build error if this assumption is violated. The lack of validation has not been an issue (I have never heard of this being a problem), but it still seems like a good idea to enforce it. Here's a simple example of a plugin that generates inconsistentsideEffects
metadata:Since esbuild processes everything in parallel, the set of metadata that ends up being used for a given path is essentially random since it's whatever the task scheduler decides to schedule first. Thus if a plugin does not consistently provide the same metadata for a given path, subsequent builds may return different results. This new validation check prevents this problem.
Here's the new error message that's shown when this happens:
Suggest enabling a missing condition when
exports
map fails (#2163)This release adds another suggestion to the error message that happens when an
exports
map lookup fails if the failure could potentially be fixed by adding a missing condition. Here's what the new error message looks like (which now suggests--conditions=module
as a possible workaround):This particular package had an issue where it was using the Webpack-specific
module
condition without providing adefault
condition. It looks like the intent in this case was to use the standardimport
condition instead. This specific change wasn't suggested here because this error message is for package consumers, not package authors.v0.14.34
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Something went wrong with the publishing script for the previous release. Publishing again.
v0.14.33
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Fix a regression regarding
super
(#2158)This fixes a regression from the previous release regarding classes with a super class, a private member, and a static field in the scenario where the static field needs to be lowered but where private members are supported by the configured target environment. In this scenario, esbuild could incorrectly inject the instance field initializers that use
this
into the constructor before the call tosuper()
, which is invalid. This problem has now been fixed (notice thatthis
is now used aftersuper()
instead of before):During parsing, esbuild scans the class and makes certain decisions about the class such as whether to lower all static fields, whether to lower each private member, or whether calls to
super()
need to be tracked and adjusted. Previously esbuild made two passes through the class members to compute this information. However, with the newsuper()
call lowering logic added in the previous release, we now need three passes to capture the whole dependency chain for this case: 1) lowering static fields requires 2) lowering private members which requires 3) adjustingsuper()
calls.The reason lowering static fields requires lowering private members is because lowering static fields moves their initializers outside of the class body, where they can't access private members anymore. Consider this code:
We can't just lower static fields without also lowering private members, since that causes a syntax error:
And the reason lowering private members requires adjusting
super()
calls is because the injected private member initializers usethis
, which is only accessible aftersuper()
calls in the constructor.Fix an issue with
--keep-names
not keeping some names (#2149)This release fixes a regression with
--keep-names
from version 0.14.26. PR #2062 attempted to remove superfluous calls to the__name
helper function by omitting calls of the form__name(foo, "foo")
where the name of the symbol in the first argument is equal to the string in the second argument. This was assuming that the initializer for the symbol would automatically be assigned the expected.name
property by the JavaScript VM, which turned out to be an incorrect assumption. To fix the regression, this PR has been reverted.The assumption is true in many cases but isn't true when the initializer is moved into another automatically-generated variable, which can sometimes be necessary during the various syntax transformations that esbuild does. For example, consider the following code:
This code should print
Bar Foo
. With--keep-names --target=es6
that code is lowered by esbuild into the following code (omitting the helper function definitions for brevity):The injection of the automatically-generated
_Foo
variable is necessary to preserve the semantics of the capturedFoo
binding for methods defined within the class body, even when the definition needs to be moved outside of the class body during code transformation. Due to a JavaScript quirk, this binding is immutable and does not change even ifFoo
is later reassigned. The PR that was reverted was incorrectly removing the call to__name(Foo, "Foo")
, which turned out to be necessary after all in this case.Print some large integers using hexadecimal when minifying (#2162)
When
--minify
is active, esbuild will now use one fewer byte to represent certain large integers:This works because a hexadecimal representation can be shorter than a decimal representation starting at around 1012 and above.
This optimization made me realize that there's probably an opportunity to optimize printed numbers for smaller gzipped size instead of or in addition to just optimizing for minimal uncompressed byte count. The gzip algorithm does better with repetitive sequences, so for example
0xFFFFFFFF
is probably a better representation than4294967295
even though the byte counts are the same. As far as I know, no JavaScript minifier does this optimization yet. I don't know enough about how gzip works to know if this is a good idea or what the right metric for this might be.Add Linux ARM64 support for Deno (#2156)
This release adds Linux ARM64 support to esbuild's Deno API implementation, which allows esbuild to be used with Deno on a Raspberry Pi.
v0.14.32
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Fix
super
usage in lowered private methods (#2039)Previously esbuild failed to transform
super
property accesses inside private methods in the case when private methods have to be lowered because the target environment doesn't support them. The generated code still contained thesuper
keyword even though the method was moved outside of the class body, which is a syntax error in JavaScript. This release fixes this transformation issue and now produces valid code:Because of this change, lowered
super
property accesses on instances were rewritten so that they can exist outside of the class body. This rewrite affects code generation for allsuper
property accesses on instances including those inside loweredasync
functions. The new approach is different but should be equivalent to the old approach:Fix some tree-shaking bugs regarding property side effects
This release fixes some cases where side effects in computed properties were not being handled correctly. Specifically primitives and private names as properties should not be considered to have side effects, and object literals as properties should be considered to have side effects:
Add the
wasmModule
option to theinitialize
JS API (#1093)The
initialize
JS API must be called when using esbuild in the browser to provide the WebAssembly module for esbuild to use. Previously the only way to do that was using thewasmURL
API option like this:With this release, you can now also initialize esbuild using a
WebAssembly.Module
instance using thewasmModule
API option instead. The example above is equivalent to the following code:This could be useful for environments where you want more control over how the WebAssembly download happens or where downloading the WebAssembly module is not possible.
v0.14.31
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Add support for parsing "optional variance annotations" from TypeScript 4.7 (#2102)
The upcoming version of TypeScript now lets you specify
in
and/orout
on certain type parameters (specifically only on a type alias, an interface declaration, or a class declaration). These modifiers control type paramemter covariance and contravariance:With this release, esbuild can now parse these new type parameter modifiers. This feature was contributed by @magic-akari.
Improve support for
super()
constructor calls in nested locations (#2134)In JavaScript, derived classes must call
super()
somewhere in theconstructor
method before being able to accessthis
. Class public instance fields, class private instance fields, and TypeScript constructor parameter properties can all potentially cause code which usesthis
to be inserted into the constructor body, which must be inserted after thesuper()
call. To make these insertions straightforward to implement, the TypeScript compiler doesn't allow callingsuper()
somewhere other than in a root-level statement in the constructor body in these cases.Previously esbuild's class transformations only worked correctly when
super()
was called in a root-level statement in the constructor body, just like the TypeScript compiler. But with this release, esbuild should now generate correct code as long as the call tosuper()
appears anywhere in the constructor body:Add support for the new
@container
CSS rule (#2127)This release adds support for
@container
in CSS files. This means esbuild will now pretty-print and minify these rules better since it now better understands the internal structure of these rules:This was contributed by @yisibl.
Avoid CSS cascade-dependent keywords in the
font-family
property (#2135)In CSS,
initial
,inherit
, andunset
are CSS-wide keywords which means they have special behavior when they are specified as a property value. For example, whilefont-family: 'Arial'
(as a string) andfont-family: Arial
(as an identifier) are the same,font-family: 'inherit'
(as a string) uses the font family namedinherit
butfont-family: inherit
(as an identifier) inherits the font family from the parent element. This means esbuild must not unquote these CSS-wide keywords (anddefault
, which is also reserved) during minification to avoid changing the meaning of the minified CSS.The current draft of the new CSS Cascading and Inheritance Level 5 specification adds another concept called cascade-dependent keywords of which there are two:
revert
andrevert-layer
. This release of esbuild guards against unquoting these additional keywords as well to avoid accidentally breaking pages that use a font with the same name:This fix was contributed by @yisibl.
v0.14.30
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Change the context of TypeScript parameter decorators (#2147)
While TypeScript parameter decorators are expressions, they are not evaluated where they exist in the code. They are moved to after the class declaration and evaluated there instead. Specifically this TypeScript code:
becomes this JavaScript code:
This has several consequences:
Whether
await
is allowed inside a decorator expression or not depends on whether the class declaration itself is in anasync
context or not. With this release, you can now useawait
inside a decorator expression when the class declaration is either inside anasync
function or is at the top-level of an ES module and top-level await is supported. Note that the TypeScript compiler currently has a bug regarding this edge case: Parameter decorators use incorrect async/await context, generated code has syntax error microsoft/TypeScript#48509.Also while TypeScript currently allows
await
to be used like this inasync
functions, it doesn't currently allowyield
to be used like this in generator functions. It's not yet clear whether this behavior withyield
is a bug or by design, so I haven't made any changes to esbuild's handling ofyield
inside decorator expressions in this release.Since the scope of a decorator expression is the scope enclosing the class declaration, they cannot access private identifiers. Previously this was incorrectly allowed but with this release, esbuild no longer allows this. Note that the TypeScript compiler currently has a bug regarding this edge case: Decorators broken with private fields, generated code has syntax error microsoft/TypeScript#48515.
Since the scope of a decorator expression is the scope enclosing the class declaration, identifiers inside parameter decorator expressions should never be resolved to a parameter of the enclosing method. Previously this could happen, which was a bug with esbuild. This bug no longer happens in this release.
Specifically previous versions of esbuild generated the following incorrect JavaScript (notice the use of
arg2
):This release now generates the following correct JavaScript (notice the use of
arg
):Fix some obscure edge cases with
super
property accessThis release fixes the following obscure problems with
super
when targeting an older JavaScript environment such as--target=es6
:The compiler could previously crash when a lowered
async
arrow function contained a class with a field initializer that used asuper
property access:The compiler could previously generate incorrect code when a lowered
async
method of a derived class contained a nested class with a computed class member involving asuper
property access on the derived class:The compiler could previously generate incorrect code when a default-exported class contained a
super
property access inside a lowered static private class field:Configuration
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