1 files changed, 236 insertions, 0 deletions
diff --git a/internal/js/esbuild/build.go b/internal/js/esbuild/build.go
new file mode 100644
index 000000000..33b91eafc
--- /dev/null
+++ b/internal/js/esbuild/build.go
@@ -0,0 +1,236 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package esbuild provides functions for building JavaScript resources.
+package esbuild
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/evanw/esbuild/pkg/api"
+	"github.com/gohugoio/hugo/common/herrors"
+	"github.com/gohugoio/hugo/common/hugio"
+	"github.com/gohugoio/hugo/common/text"
+	"github.com/gohugoio/hugo/hugofs"
+	"github.com/gohugoio/hugo/hugolib/filesystems"
+	"github.com/gohugoio/hugo/identity"
+	"github.com/gohugoio/hugo/resources"
+)
+
+// NewBuildClient creates a new BuildClient.
+func NewBuildClient(fs *filesystems.SourceFilesystem, rs *resources.Spec) *BuildClient {
+	return &BuildClient{
+		rs:  rs,
+		sfs: fs,
+	}
+}
+
+// BuildClient is a client for building JavaScript resources using esbuild.
+type BuildClient struct {
+	rs  *resources.Spec
+	sfs *filesystems.SourceFilesystem
+}
+
+// Build builds the given JavaScript resources using esbuild with the given options.
+func (c *BuildClient) Build(opts Options) (api.BuildResult, error) {
+	dependencyManager := opts.DependencyManager
+	if dependencyManager == nil {
+		dependencyManager = identity.NopManager
+	}
+
+	opts.OutDir = c.rs.AbsPublishDir
+	opts.ResolveDir = c.rs.Cfg.BaseConfig().WorkingDir // where node_modules gets resolved
+	opts.AbsWorkingDir = opts.ResolveDir
+	opts.TsConfig = c.rs.ResolveJSConfigFile("tsconfig.json")
+	assetsResolver := newFSResolver(c.rs.Assets.Fs)
+
+	if err := opts.validate(); err != nil {
+		return api.BuildResult{}, err
+	}
+
+	if err := opts.compile(); err != nil {
+		return api.BuildResult{}, err
+	}
+
+	var err error
+	opts.compiled.Plugins, err = createBuildPlugins(c.rs, assetsResolver, dependencyManager, opts)
+	if err != nil {
+		return api.BuildResult{}, err
+	}
+
+	if opts.Inject != nil {
+		// Resolve the absolute filenames.
+		for i, ext := range opts.Inject {
+			impPath := filepath.FromSlash(ext)
+			if filepath.IsAbs(impPath) {
+				return api.BuildResult{}, fmt.Errorf("inject: absolute paths not supported, must be relative to /assets")
+			}
+
+			m := assetsResolver.resolveComponent(impPath)
+
+			if m == nil {
+				return api.BuildResult{}, fmt.Errorf("inject: file %q not found", ext)
+			}
+
+			opts.Inject[i] = m.Filename
+
+		}
+
+		opts.compiled.Inject = opts.Inject
+
+	}
+
+	result := api.Build(opts.compiled)
+
+	if len(result.Errors) > 0 {
+		createErr := func(msg api.Message) error {
+			if msg.Location == nil {
+				return errors.New(msg.Text)
+			}
+			var (
+				contentr     hugio.ReadSeekCloser
+				errorMessage string
+				loc          = msg.Location
+				errorPath    = loc.File
+				err          error
+			)
+
+			var resolvedError *ErrorMessageResolved
+
+			if opts.ErrorMessageResolveFunc != nil {
+				resolvedError = opts.ErrorMessageResolveFunc(msg)
+			}
+
+			if resolvedError == nil {
+				if errorPath == stdinImporter {
+					errorPath = opts.StdinSourcePath
+				}
+
+				errorMessage = msg.Text
+
+				var namespace string
+				for _, ns := range hugoNamespaces {
+					if strings.HasPrefix(errorPath, ns) {
+						namespace = ns
+						break
+					}
+				}
+
+				if namespace != "" {
+					namespace += ":"
+					errorMessage = strings.ReplaceAll(errorMessage, namespace, "")
+					errorPath = strings.TrimPrefix(errorPath, namespace)
+					contentr, err = hugofs.Os.Open(errorPath)
+				} else {
+					var fi os.FileInfo
+					fi, err = c.sfs.Fs.Stat(errorPath)
+					if err == nil {
+						m := fi.(hugofs.FileMetaInfo).Meta()
+						errorPath = m.Filename
+						contentr, err = m.Open()
+					}
+				}
+			} else {
+				contentr = resolvedError.Content
+				errorPath = resolvedError.Path
+				errorMessage = resolvedError.Message
+			}
+
+			if contentr != nil {
+				defer contentr.Close()
+			}
+
+			if err == nil {
+				fe := herrors.
+					NewFileErrorFromName(errors.New(errorMessage), errorPath).
+					UpdatePosition(text.Position{Offset: -1, LineNumber: loc.Line, ColumnNumber: loc.Column}).
+					UpdateContent(contentr, nil)
+
+				return fe
+			}
+
+			return fmt.Errorf("%s", errorMessage)
+		}
+
+		var errors []error
+
+		for _, msg := range result.Errors {
+			errors = append(errors, createErr(msg))
+		}
+
+		// Return 1, log the rest.
+		for i, err := range errors {
+			if i > 0 {
+				c.rs.Logger.Errorf("js.Build failed: %s", err)
+			}
+		}
+
+		return result, errors[0]
+	}
+
+	inOutputPathToAbsFilename := opts.ResolveSourceMapSource
+	opts.ResolveSourceMapSource = func(s string) string {
+		if inOutputPathToAbsFilename != nil {
+			if filename := inOutputPathToAbsFilename(s); filename != "" {
+				return filename
+			}
+		}
+
+		if m := assetsResolver.resolveComponent(s); m != nil {
+			return m.Filename
+		}
+
+		return ""
+	}
+
+	for i, o := range result.OutputFiles {
+		if err := fixOutputFile(&o, func(s string) string {
+			if s == "<stdin>" {
+				return opts.ResolveSourceMapSource(opts.StdinSourcePath)
+			}
+			var isNsHugo bool
+			if strings.HasPrefix(s, "ns-hugo") {
+				isNsHugo = true
+				idxColon := strings.Index(s, ":")
+				s = s[idxColon+1:]
+			}
+
+			if !strings.HasPrefix(s, PrefixHugoVirtual) {
+				if !filepath.IsAbs(s) {
+					s = filepath.Join(opts.OutDir, s)
+				}
+			}
+
+			if isNsHugo {
+				if ss := opts.ResolveSourceMapSource(s); ss != "" {
+					if strings.HasPrefix(ss, PrefixHugoMemory) {
+						// File not on disk, mark it for removal from the sources slice.
+						return ""
+					}
+					return ss
+				}
+				return ""
+			}
+			return s
+		}); err != nil {
+			return result, err
+		}
+		result.OutputFiles[i] = o
+	}
+
+	return result, nil
+}