fix #213; expose Generators as constant (#214)

Author: mbostock

src/library.js

@@ -19,28 +19,32 @@ import width from "./width.js";
 export default Object.assign(function Library(resolver) {
   const require = requirer(resolver);
   Object.defineProperties(this, properties({
-    DOM: () => DOM,
     FileAttachment: () => NoFileAttachments,
-    Files: () => Files,
-    Generators: () => Generators,
     Inputs: () => require("@observablehq/[email protected]/dist/inputs.umd.min.js"),
     Mutable: () => Mutable,
     Plot: () => require("@observablehq/[email protected]/dist/plot.umd.min.js"),
-    Promises: () => Promises,
     SQLite: () => SQLite(require),
     _: () => require("[email protected]/lodash.min.js"),
     d3: () => require("[email protected]/dist/d3.min.js"),
     dot: () => require("@observablehq/[email protected]/dist/graphviz.min.js"),
     htl: () => require("[email protected]/dist/htl.min.js"),
     html: () => html,
     md: () => md(require),
-    now: now,
+    now,
     require: () => require,
     resolve: () => resolve,
     svg: () => svg,
     tex: () => tex(require),
     vl: () => vegalite(require),
-    width: width
+    width,
+
+    // Note: these are namespace objects, and thus exposed directly rather than
+    // being wrapped in a function. This allows library.Generators to resolve,
+    // rather than needing module.value.
+    DOM,
+    Files,
+    Generators,
+    Promises
   }));
 }, {resolve: requireDefault.resolve});
 

test/generators/generators-test.js

@@ -5,6 +5,13 @@ import range from "../../src/generators/range";
 import valueAt from "../../src/generators/valueAt";
 import observe from "../../src/generators/observe";
 import queue from "../../src/generators/queue";
+import Library from "../../src/library";
+
+test("library.Generators.observe is a function", t => {
+  const library = new Library();
+  t.equal(typeof library.Generators.observe, "function");
+  t.end();
+});
 
 test("filter(value, fn) filters", t => {
   function* input() {