Review round 1 for the Node build module: build depth (1490), bin scripts for the test script (1491), toolchain.reported and its stream (1483, 1488); delta part 3 of 4

modules/mesh-build-node/cmd/mesh-build-node/build.go

@@ -83,8 +83,25 @@ func (m *Module) build(ctx context.Context, args map[string]any) (any, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err := m.provide(root); err != nil {
-		return nil, fmt.Errorf("providing the toolchain's packages to the workspace: %w", err)
+	if why, err := lockProblem(dir, module); err != nil || why != "" {
+		if err == nil {
+			err = fmt.Errorf("%s was refused by the fetch: %s", name, why)
+		}
+		return nil, err
+	}
+	// Built at the build agent's depth (builder.go: the module at /app/modules/module, the packages at /app/node_modules),
+	// so the path comments esbuild writes, `../../node_modules/...`, and with them the bundle's bytes equal its.
+	stage := filepath.Join(root, "stage-"+a.Name)
+	if err := os.RemoveAll(stage); err != nil {
+		return nil, err
+	}
+	src := dir
+	dir = filepath.Join(stage, "modules", "module")
+	if err := copyTree(src, dir); err != nil {
+		return nil, fmt.Errorf("staging the module: %w", err)
+	}
+	if err := copyPackages(filepath.Join(m.toolchainDir(), "node_modules"), filepath.Join(stage, "node_modules")); err != nil {
+		return nil, fmt.Errorf("providing the toolchain's packages to the build: %w", err)
 	}
 	out, final := Out(a.Name), Out(a.Name)+".bundled"
 	if err := os.MkdirAll(filepath.Join(dir, out), 0o755); err != nil {