chore: Cleanup shared test utils package.

 - Move @css-blocks/build => @css-blocks/test-utils.
 - Move @css-blocks/test-utils to devDependencies in JSX integration.
 - Clean up exports API of test-utils so we don't need deep requires.
 - Clean up typings of mock function in test-utils so we don't need Object.apply.
 - Add README for test-utils.
 - Rename transient-fs to mock-fs.
 - Move _files and _directories private properties to truly private module scoped contants.

.travis.yml

@@ -7,6 +7,7 @@ language: node_js
 node_js:
   - "8"
   - "10"
+  - "11"
 
 env:
   - CXX=g++-4.8

css-blocks.code-workspace

@@ -35,7 +35,7 @@
 			"path": "packages/@css-blocks/ember-cli"
 		},
 		{
-			"path": "packages/@css-blocks/build"
+			"path": "packages/@css-blocks/test-utils"
 		}
 	],
 	"settings": {

packages/@css-blocks/core/src/Analyzer/ElementAnalysis.ts

@@ -851,6 +851,7 @@ function mapChoiceClasses(
   configuration: ResolvedConfiguration,
   map: Map<string, Style>,
   includeAbsent: boolean,
+  /* tslint:disable-next-line */
   ...styles: Style[]
 ): AttributeValueChoice {
   let choices = new Array<AttributeValueChoiceOption>();

packages/@css-blocks/jsx/package.json

@@ -40,6 +40,7 @@
     "access": "public"
   },
   "devDependencies": {
+    "@css-blocks/test-utils": "^0.20.0-beta.4",
     "@css-blocks/code-style": "^0.20.0-beta.4",
     "@css-blocks/runtime": "^0.20.0-beta.4",
     "babel-core": "^6.25.0",
@@ -50,7 +51,6 @@
     "@css-blocks/runtime": "^0.18.0"
   },
   "dependencies": {
-    "@css-blocks/build": "^0.20.0-beta.4",
     "@css-blocks/core": "^0.20.0-beta.4",
     "@opticss/template-api": "^0.4.0",
     "@opticss/util": "^0.4.0",

packages/@css-blocks/jsx/test/analyzer/class-states-objstr-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/dynamic-styles-test.ts

@@ -1,4 +1,4 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
 
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";

packages/@css-blocks/jsx/test/analyzer/external-objstr-class-test.ts

@@ -1,4 +1,4 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
 
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";

packages/@css-blocks/jsx/test/analyzer/external-objstr-root-styles-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/inline-class-styles-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/inline-objstr-styles-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/inline-root-styles-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/root-states-objstr-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/states-attributes-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { skip, suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/analyzer/typed-file-analysis.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { skip, suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/blockImporter-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { Block } from "@css-blocks/core";
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";

packages/@css-blocks/jsx/test/parser-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { assert } from "chai";
 import { suite, test } from "mocha-typescript";
 

packages/@css-blocks/jsx/test/transformer/transformer-test.ts

@@ -1,4 +1,5 @@
-import mock from "@css-blocks/build/dist/src/testing/transient-fs";
+import { mock } from "@css-blocks/test-utils";
+
 import { Analysis, BlockCompiler, Options as CSSBlocksOptions, StyleMapping, resolveConfiguration as resolveBlocksConfiguration } from "@css-blocks/core";
 import c$$ from "@css-blocks/runtime";
 import { TemplateIntegrationOptions } from "@opticss/template-api";

packages/@css-blocks/test-utils/README.md

@@ -0,0 +1,28 @@
+# Shared Test Utilities for `@css-blocks` Packages
+
+These utilities are only used in the @css-blocks tests, so this package is not published.
+
+## `import { mock } from @css-blocks/test-utils`
+
+The `mock` utility provides tests the ability to temporarily mocks files on the filesystem. Works for all supported versions of Node.js. Once mocked, files generated using `mock` can be accessed like regular files by all Node.js filesystem calls.
+
+You can mock files using the following API:
+
+```js
+mock({
+  'filename.js': 'file-contents',
+  'foldernames': {
+    'can': {
+      'nest': {
+        'file.css': 'file-contents'
+      }
+    }
+  }
+});
+```
+
+To clean up all mocked filesystem files and directories when done, simply call:
+
+```js
+mock.restore();
+```

packages/@css-blocks/build/package.json → packages/@css-blocks/test-utils/package.json

@@ -1,9 +1,9 @@
 {
-  "name": "@css-blocks/build",
+  "name": "@css-blocks/test-utils",
   "private": true,
   "version": "0.20.0-beta.4",
-  "description": "Build-time support for @css-blocks/*.",
-  "main": "dist/src/index.js",
+  "description": "Shared test utilities for @css-blocks/*.",
+  "main": "dist/src",
   "scripts": {
     "compile": "tsc --version && rm -rf dist && tsc",
     "pretest": "yarn run compile",

packages/@css-blocks/test-utils/src/index.ts

@@ -0,0 +1 @@
+export * from "./mock-fs";

packages/@css-blocks/build/src/testing/transient-fs.ts → packages/@css-blocks/test-utils/src/mock-fs/index.ts

@@ -6,14 +6,16 @@ export interface FileContent {
   [filename: string]: string | FileContent;
 }
 
-export interface TransientFiles {
+export interface FileMocker {
   (filesObj: FileContent): void;
   restore: () => void;
-  _files: string[];
-  _directories: string[];
+  fileCount: () => number;
 }
 
-function transientFS(filesObj: FileContent) {
+const FILES: string[] = [];
+const DIRS: string[] = [];
+
+export const mock = <FileMocker>function mock(filesObj: FileContent) {
   let keys = Object.keys(filesObj);
   for (let key of keys) {
     let content = filesObj[key];
@@ -23,41 +25,36 @@ function transientFS(filesObj: FileContent) {
         if (!existsSync(key)) {
           mkdirSync(key);
           let fullPath = path.resolve(key);
-          transient._directories.push(fullPath);
+          DIRS.push(fullPath);
         }
         process.chdir(key);
-        transientFS(content);
+        mock(content);
       }
       finally {
         process.chdir(dir);
       }
     } else {
       let fullPath = path.resolve(key);
       writeFileSync(fullPath, content);
-      transient._files.push(fullPath);
+      FILES.push(fullPath);
     }
   }
-}
+};
 
-function restore() {
+mock.restore = function restore() {
   let file, dir;
-  while (file = transient._files.pop()) {
+  while (file = FILES.pop()) {
     if (existsSync(file)) {
       unlinkSync(file);
     }
   }
-  while (dir = transient._directories.pop()) {
+  while (dir = DIRS.pop()) {
     if (existsSync(dir)) {
       rmdirSync(dir);
     }
   }
-}
-
-const transient: TransientFiles = Object.assign(transientFS, {
-  _files: [],
-  _directories: [],
-  restore,
-});
+};
 
-// tslint:disable-next-line no-default-export
-export default transient;
+mock.fileCount = function fileCount(): number {
+  return FILES.length;
+};

packages/@css-blocks/build/test/transient-fs-test.ts → packages/@css-blocks/test-utils/test/mock-fs-test.ts

@@ -3,9 +3,9 @@ import * as fs from "fs";
 import { suite, test } from "mocha-typescript";
 import * as path from "path";
 
-import mock from "../src/testing/transient-fs";
+import { mock } from "../src/mock-fs";
 
-@suite("transient-fs")
+@suite("mock-fs")
 export class TransientFsTest {
   @test "can write and clean up files"() {
     mock({
@@ -40,7 +40,7 @@ export class TransientFsTest {
     assert.isFalse(fs.existsSync("top-file.txt"));
   }
   @test "can restore no files"() {
-    assert.equal(mock._files.length, 0);
+    assert.equal(mock.fileCount(), 0);
     mock.restore();
   }
 }