js.Build: Add SourceMap flag with inline option

Added a flag to allow turning on sourcemap in ESBuild. The current support
can only support inline or true as value for sourcemap. This is because
the way ESBuild is invoked it doesn't have a separate output path
to write the mapfile external to the asset pipeline. Add disable for "" and "0".
Add test script and make sure mage check passes.

Fixes #7607

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/jdkato/prose v1.1.1
 	github.com/kr/pretty v0.2.0 // indirect
 	github.com/kyokomi/emoji v2.2.1+incompatible
-	github.com/magefile/mage v1.9.0
+	github.com/magefile/mage v1.10.0
 	github.com/markbates/inflect v1.0.0
 	github.com/mattn/go-isatty v0.0.12
 	github.com/miekg/mmark v1.3.6

go.sum

@@ -125,6 +125,7 @@ github.com/evanw/esbuild v0.6.2 h1:pp33TIPgiHCtKL/gMW/V/PFHWNx/5cDTqbJHqAiy0jg=
 github.com/evanw/esbuild v0.6.2/go.mod h1:mptxmSXIzBIKKCe4jo9A5SToEd1G+AKZ9JmY85dYRJ0=
 github.com/evanw/esbuild v0.6.5 h1:jVUDkQKOX9srwt/mUlvIba0/jmH46+B5wfwh0pWW7BM=
 github.com/evanw/esbuild v0.6.5/go.mod h1:mptxmSXIzBIKKCe4jo9A5SToEd1G+AKZ9JmY85dYRJ0=
+github.com/evanw/esbuild v0.6.28 h1:sTJdvTB8WCSp9N5a+T18Fw3a5So76qHQJHwYNhy0Z/c=
 github.com/fortytw2/leaktest v1.2.0 h1:cj6GCiwJDH7l3tMHLjZDo0QqPtrXJiWSI9JgpeQKw+Q=
 github.com/fortytw2/leaktest v1.2.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
@@ -240,6 +241,8 @@ github.com/kyokomi/emoji v2.2.1+incompatible/go.mod h1:mZ6aGCD7yk8j6QY6KICwnZ2px
 github.com/lib/pq v1.1.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/magefile/mage v1.9.0 h1:t3AU2wNwehMCW97vuqQLtw6puppWXHO+O2MHo5a50XE=
 github.com/magefile/mage v1.9.0/go.mod h1:z5UZb/iS3GoOSn0JgWuiw7dxlurVYTu+/jHXqQg881A=
+github.com/magefile/mage v1.10.0 h1:3HiXzCUY12kh9bIuyXShaVe529fJfyqoVM42o/uom2g=
+github.com/magefile/mage v1.10.0/go.mod h1:z5UZb/iS3GoOSn0JgWuiw7dxlurVYTu+/jHXqQg881A=
 github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDePerRcY=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=

resources/resource_transformers/js/build.go

@@ -42,6 +42,9 @@ type Options struct {
 	// Whether to minify to output.
 	Minify bool
 
+	// Whether to write mapfiles (currently inline only)
+	SourceMap string
+
 	// The language target.
 	// One of: es2015, es2016, es2017, es2018, es2019, es2020 or esnext.
 	// Default is esnext.
@@ -217,12 +220,24 @@ func toBuildOptions(opts Options) (buildOptions api.BuildOptions, err error) {
 		defines = cast.ToStringMapString(opts.Defines)
 	}
 
+	var sourceMap api.SourceMap
+	switch opts.SourceMap {
+	case "inline":
+		sourceMap = api.SourceMapInline
+	case "":
+		sourceMap = api.SourceMapNone
+	default:
+		err = fmt.Errorf("unsupported sourcemap type: %q", opts.SourceMap)
+		return
+	}
+
 	buildOptions = api.BuildOptions{
 		Outfile: "",
 		Bundle:  true,
 
-		Target: target,
-		Format: format,
+		Target:    target,
+		Format:    format,
+		Sourcemap: sourceMap,
 
 		MinifyWhitespace:  opts.Minify,
 		MinifyIdentifiers: opts.Minify,

resources/resource_transformers/js/build_test.go

@@ -63,4 +63,18 @@ func TestToBuildOptions(t *testing.T) {
 		Stdin:             &api.StdinOptions{},
 	})
 
+	opts, err = toBuildOptions(Options{
+		Target: "es2018", Format: "cjs", Minify: true, mediaType: media.JavascriptType,
+		SourceMap: "inline"})
+	c.Assert(err, qt.IsNil)
+	c.Assert(opts, qt.DeepEquals, api.BuildOptions{
+		Bundle:            true,
+		Target:            api.ES2018,
+		Format:            api.FormatCommonJS,
+		MinifyIdentifiers: true,
+		MinifySyntax:      true,
+		MinifyWhitespace:  true,
+		Sourcemap:         api.SourceMapInline,
+		Stdin:             &api.StdinOptions{},
+	})
 }