Add "hugo mod npm pack"

This commit also introduces a convention where these common JS config files, including `package.hugo.json`, gets mounted into:

```
assets/_jsconfig
´``

These files mapped to their real filename will be added to the environment when running PostCSS, Babel etc., so you can do `process.env.HUGO_FILE_TAILWIND_CONFIG_JS` to resolve the real filename.

But do note that `assets` is a composite/union filesystem, so if your config file is not meant to be overridden, name them something specific.

This commit also adds adds `workDir/node_modules` to `NODE_PATH` and `HUGO_WORKDIR` to the env when running the JS tools above.

Fixes #7644
Fixes #7656
Fixes #7675

1 files changed, 10 insertions, 0 deletions

diff --git a/hugofs/files/classifier.go b/hugofs/files/classifier.go
index 5e26bbac0..35e416c8f 100644
--- a/hugofs/files/classifier.go
+++ b/hugofs/files/classifier.go
@@ -26,6 +26,13 @@ import (
 	"github.com/spf13/afero"
 )
 
+const (
+	// The NPM package.json "template" file.
+	FilenamePackageHugoJSON = "package.hugo.json"
+	// The NPM package file.
+	FilenamePackageJSON = "package.json"
+)
+
 var (
 	// This should be the only list of valid extensions for content files.
 	contentFileExtensions = []string{
@@ -163,9 +170,12 @@ const (
 	ComponentFolderI18n       = "i18n"
 
 	FolderResources = "resources"
+	FolderJSConfig  = "_jsconfig" // Mounted below /assets with postcss.config.js etc.
 )
 
 var (
+	JsConfigFolderMountPrefix = filepath.Join(ComponentFolderAssets, FolderJSConfig)
+
 	ComponentFolders = []string{
 		ComponentFolderArchetypes,
 		ComponentFolderStatic,