feat(compiler): add "exports" to marko.json

packages/compiler/src/taglib/finder/index.js

@@ -120,7 +120,7 @@ function find(dirname, registeredTaglibs) {
           nodePath.join(name, "marko.json")
         );
         if (taglibPath) {
-          var taglib = taglibLoader.loadTaglibFromFile(taglibPath);
+          var taglib = taglibLoader.loadTaglibFromFile(taglibPath, true);
           helper.addTaglib(taglib);
         }
       }

packages/compiler/src/taglib/loader/Taglib.js

@@ -26,9 +26,10 @@ function handleImport(taglib, importedTaglib) {
 }
 
 class Taglib {
-  constructor(filePath) {
+  constructor(filePath, isFromPackageJson) {
     ok(filePath, '"filePath" expected');
     this.filePath = this.path /* deprecated */ = this.id = filePath;
+    this.isFromPackageJson = isFromPackageJson === true;
     this.dirname = path.dirname(this.filePath);
     this.scriptLang = undefined;
     this.tags = {};

packages/compiler/src/taglib/loader/index.js

@@ -8,8 +8,8 @@ function loadTaglibFromProps(taglib, taglibProps) {
   return loaders.loadTaglibFromProps(taglib, taglibProps);
 }
 
-function loadTaglibFromFile(filePath) {
-  return loaders.loadTaglibFromFile(filePath);
+function loadTaglibFromFile(filePath, isFromPackageJson) {
+  return loaders.loadTaglibFromFile(filePath, isFromPackageJson);
 }
 
 function loadTaglibFromDir(filePath) {

packages/compiler/src/taglib/loader/loadTaglibFromFile.js

@@ -5,15 +5,15 @@ var loaders = require("./loaders");
 
 var ok = require("assert").ok;
 
-function loadFromFile(filePath) {
+function loadFromFile(filePath, isFromPackageJson) {
   ok(filePath, '"filePath" is required');
 
   var taglib = cache.get(filePath);
 
   // Only load a taglib once by caching the loaded taglibs using the file
   // system file path as the key
   if (!taglib) {
-    taglib = new types.Taglib(filePath);
+    taglib = new types.Taglib(filePath, isFromPackageJson);
     cache.put(filePath, taglib);
 
     var taglibProps = jsonFileReader.readFileSync(filePath);

packages/compiler/src/taglib/loader/loadTaglibFromProps.js

@@ -252,6 +252,24 @@ class TaglibLoader {
     }
   }
 
+  exports(dir) {
+    var taglib = this.taglib;
+    var path = this.filePath;
+    var dirname = this.dirname;
+
+    if (taglib.isFromPackageJson) {
+      taglib.tagsDir = false;
+
+      scanTagsDir(
+        path,
+        dirname,
+        dir,
+        taglib,
+        this.dependencyChain.append(`exports`)
+      );
+    }
+  }
+
   taglibImports(imports) {
     // The "taglib-imports" property allows another taglib to be imported
     // into this taglib so that the tags defined in the imported taglib

packages/marko/test/taglib-finder/fixtures/exports/marko.json

@@ -0,0 +1,3 @@
+{
+  "exports": "_dist/components"
+}

packages/marko/test/taglib-finder/fixtures/exports/package.json

@@ -0,0 +1,7 @@
+{
+    "name": "taglib-finder-test",
+    "version": "0.0.0",
+    "dependencies": {
+        "included-dependency": "0.0.1"
+    }
+}

packages/marko/test/taglib-finder/fixtures/exports/test.js

@@ -0,0 +1,11 @@
+var expect = require("chai").expect;
+
+exports.check = function (taglibFinder) {
+  const discoveredTags = taglibFinder
+    .find(__dirname, [])
+    .flatMap((taglib) => Object.keys(taglib.tags));
+
+  expect(discoveredTags).to.include("included-tag");
+  expect(discoveredTags).to.include("dev-tag");
+  expect(discoveredTags).to.not.include("dist-tag");
+};