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js: Add avoidTDZ option

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Fixes #7865
This commit is contained in:
Bjørn Erik Pedersen 2020-11-03 09:05:09 +01:00
parent 85e4dd7370
commit 3b2fe3cd33
4 changed files with 24 additions and 1 deletions
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3
docs/content/en/hugo-pipes/js.md
View file

@ -40,6 +40,9 @@ Note that this is meant for small data sets, e.g. config settings. For larger da
minify [bool]
: Let `js.Build` handle the minification.
avoidTDZ {{< new-in "0.78.0" >}}
: There is/was a bug in WebKit with severe performance issue with the tracking of TDZ checks in JavaScriptCore. Enabling this flag removes the TDZ and `const` assignment checks and may improve performance of larger JS codebases until the WebKit fix is in widespread use. See https://bugs.webkit.org/show_bug.cgi?id=199866
target [string]
: The language target.
One of: `es5`, `es2015`, `es2016`, `es2017`, `es2018`, `es2019`, `es2020` or `esnext`.

2
go.sum
View file

@ -459,6 +459,8 @@ github.com/spf13/afero v1.2.2 h1:5jhuqJyZCZf2JRofRvN/nIFgIWNzPa3/Vz8mYylgbWc=
github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
github.com/spf13/afero v1.4.0 h1:jsLTaI1zwYO3vjrzHalkVcIHXTNmdQFepW4OI8H3+x8=
github.com/spf13/afero v1.4.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
github.com/spf13/afero v1.4.1 h1:asw9sl74539yqavKaglDM5hFpdJVK0Y5Dr/JOgQ89nQ=
github.com/spf13/afero v1.4.1/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
github.com/spf13/cast v1.3.0 h1:oget//CVOEoFewqQxwr0Ej5yjygnqGkvggSE/gB35Q8=
github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
github.com/spf13/cast v1.3.1 h1:nFm6S0SMdyzrzcmThSipiEubIDy8WEXKNZ0UOgiRpng=

12
resources/resource_transformers/js/options.go
View file

@ -70,6 +70,16 @@ type Options struct {
// What to use instead of React.Fragment.
JSXFragment string
// There is/was a bug in WebKit with severe performance issue with the tracking
// of TDZ checks in JavaScriptCore.
//
// Enabling this flag removes the TDZ and `const` assignment checks and
// may improve performance of larger JS codebases until the WebKit fix
// is in widespread use.
//
// See https://bugs.webkit.org/show_bug.cgi?id=199866
AvoidTDZ bool
mediaType media.Type
outDir string
contents string
@ -339,6 +349,8 @@ func toBuildOptions(opts Options) (buildOptions api.BuildOptions, err error) {
JSXFactory: opts.JSXFactory,
JSXFragment: opts.JSXFragment,
AvoidTDZ: opts.AvoidTDZ,
Tsconfig: opts.tsConfig,
Stdin: &api.StdinOptions{

8
resources/resource_transformers/js/options_test.go
View file

@ -54,7 +54,12 @@ func TestToBuildOptions(t *testing.T) {
})
opts, err = toBuildOptions(Options{
Target: "es2018", Format: "cjs", Minify: true, mediaType: media.JavascriptType})
Target: "es2018",
Format: "cjs",
Minify: true,
mediaType: media.JavascriptType,
AvoidTDZ: true,
})
c.Assert(err, qt.IsNil)
c.Assert(opts, qt.DeepEquals, api.BuildOptions{
Bundle: true,
@ -63,6 +68,7 @@ func TestToBuildOptions(t *testing.T) {
MinifyIdentifiers: true,
MinifySyntax: true,
MinifyWhitespace: true,
AvoidTDZ: true,
Stdin: &api.StdinOptions{
Loader: api.LoaderJS,
},