feat: transform 'styles' only in decorator

Until now we transformed 'templateUrl', 'styleUrls' and 'styles' everywhere they were assigned. The new implementation of the AstTransformer splits it in two: * InlineFilesTransformer, which inlines `templateUrl` and removes `styleUrls` files * StripStylesTransformer, which removes the `styles` property, but only inside the `@Component` decorator
thymikee · Jun 10, 2019 · 252144e · 252144e
1 parent 1079528
commit 252144e
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Showing 9 changed files with 445 additions and 112 deletions.
diff --git a/.gitignore b/.gitignore
@@ -1,4 +1,6 @@
 node_modules
-InlineHtmlStripStylesTransformer.js
+InlineFilesTransformer.js
+StripStylesTransformer.js
+TransformUtils.js
 *.log
 .idea
diff --git a/.../InlineHtmlStripStylesTransformer.test.ts → __tests__/InlineFilesTransformer.test.ts b/.../InlineHtmlStripStylesTransformer.test.ts → __tests__/InlineFilesTransformer.test.ts
@@ -1,11 +1,11 @@
 /*
  * Code is inspired by
  * https://github.com/kulshekhar/ts-jest/blob/25e1c63dd3797793b0f46fa52fdee580b46f66ae/src/transformers/hoist-jest.spec.ts
- * 
+ *
  */
 
-import * as tsc from 'typescript'
-import * as transformer from '../InlineHtmlStripStylesTransformer'
+import * as tsc from 'typescript';
+import * as transformer from '../InlineFilesTransformer';
 
 const CODE_WITH_TEMPLATE_URL = `
   import { Component } from '@angular/core';
@@ -15,7 +15,7 @@ const CODE_WITH_TEMPLATE_URL = `
   })
   export class AngularComponent {
   }
-`
+`;
 
 const CODE_WITH_NON_RELATIVE_TEMPLATE_URL = `
   import { Component } from '@angular/core';
@@ -25,7 +25,7 @@ const CODE_WITH_NON_RELATIVE_TEMPLATE_URL = `
   })
   export class AngularComponent {
   }
-`
+`;
 
 const CODE_WITH_STYLE_URLS = `
   import { Component } from '@angular/core';
@@ -38,7 +38,7 @@ const CODE_WITH_STYLE_URLS = `
   })
   export class AngularComponent {
   }
-`
+`;
 
 const CODE_WITH_STYLES = `
   import { Component } from '@angular/core';
@@ -51,7 +51,7 @@ const CODE_WITH_STYLES = `
   })
   export class AngularComponent {
   }
-`
+`;
 
 const CODE_WITH_ALL_DECORATOR_PROPERTIES = `
   import { Component } from '@angular/core';
@@ -76,7 +76,7 @@ const CODE_WITH_ALL_DECORATOR_PROPERTIES = `
   })
   export class AngularComponent {
   }
-`
+`;
 
 const CODE_WITH_CUSTOM_DECORATOR = `
   import { Component as CustomDecoratorName } from '@angular/core';
@@ -86,7 +86,7 @@ const CODE_WITH_CUSTOM_DECORATOR = `
   })
   export class AngularComponent {
   }
-`
+`;
 
 const CODE_TEST_WITH_TEMPLATE_URL_OVERRIDE = `
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
@@ -117,62 +117,80 @@ describe('AComponent', () => {
     expect(fixture).toMatchSnapshot();
   });
 });
-`
-
-
+`;
+
+const CODE_WITH_ASSIGNMENTS_OUTSIDE_DECORATOR = `
+  const assignmentsToNotBeTransformed = {
+    styles: [{
+      color: 'red'
+    }]
+  };
+   const assignmentsToBeTransformed = {
+    styleUrls: ['./some-styles.css'],
+    templateUrl: './some-styles.css'
+  };
+`;
 
 const createFactory = () => {
-  return transformer.factory({ compilerModule: tsc } as any)
-}
-const transpile = (source: string) => tsc.transpileModule(source, { transformers: { before: [createFactory()] } })
+  return transformer.factory({ compilerModule: tsc } as any);
+};
+const transpile = (source: string) =>
+  tsc.transpileModule(source, { transformers: { before: [createFactory()] } });
+
 
 describe('inlining template and stripping styles', () => {
   it('should have correct signature', () => {
-    expect(transformer.name).toBe('angular-component-inline-template-strip-styles')
-    expect(typeof transformer.version).toBe('number')
-    expect(transformer.version).toBeGreaterThan(0)
-    expect(typeof transformer.factory).toBe('function')
-  })
+    expect(transformer.name).toBe('angular-component-inline-files');
+    expect(typeof transformer.version).toBe('number');
+    expect(transformer.version).toBeGreaterThan(0);
+    expect(typeof transformer.factory).toBe('function');
+  });
 
   it('should strip styleUrl assignment', () => {
-    const out = transpile(CODE_WITH_STYLE_URLS)
+    const out = transpile(CODE_WITH_STYLE_URLS);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
+    expect(out.outputText).toMatchSnapshot();
+  });
 
   it('should strip styles assignment', () => {
-    const out = transpile(CODE_WITH_STYLES)
+    const out = transpile(CODE_WITH_STYLES);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
+    expect(out.outputText).toMatchSnapshot();
+  });
 
   it('should inline templateUrl assignment', () => {
-    const out = transpile(CODE_WITH_TEMPLATE_URL)
+    const out = transpile(CODE_WITH_TEMPLATE_URL);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
+    expect(out.outputText).toMatchSnapshot();
+  });
 
   it('should inline non-relative templateUrl assignment and make it relative', () => {
-    const out = transpile(CODE_WITH_NON_RELATIVE_TEMPLATE_URL)
+    const out = transpile(CODE_WITH_NON_RELATIVE_TEMPLATE_URL);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
+    expect(out.outputText).toMatchSnapshot();
+  });
 
   it('should handle all transformable decorator assignments', () => {
-    const out = transpile(CODE_WITH_ALL_DECORATOR_PROPERTIES)
+    const out = transpile(CODE_WITH_ALL_DECORATOR_PROPERTIES);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
+    expect(out.outputText).toMatchSnapshot();
+  });
 
   it('should handle all decorator assignments in differently named decorators', () => {
-    const out = transpile(CODE_WITH_CUSTOM_DECORATOR)
+    const out = transpile(CODE_WITH_CUSTOM_DECORATOR);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
+    expect(out.outputText).toMatchSnapshot();
+  });
 
   it('should handle templateUrl in test file outside decorator', () => {
-    const out = transpile(CODE_TEST_WITH_TEMPLATE_URL_OVERRIDE)
+    const out = transpile(CODE_TEST_WITH_TEMPLATE_URL_OVERRIDE);
 
-    expect(out.outputText).toMatchSnapshot()
-  })
-})
+    expect(out.outputText).toMatchSnapshot();
+  });
+
+  it('should not transform styles outside decorator', () => {
+    const out = transpile(CODE_WITH_ASSIGNMENTS_OUTSIDE_DECORATOR);
+
+    expect(out.outputText).toMatchSnapshot();
+  });
+});
diff --git a/__tests__/StripStylesTransformer.test.ts b/__tests__/StripStylesTransformer.test.ts
@@ -0,0 +1,68 @@
+/*
+ * Code is inspired by
+ * https://github.com/kulshekhar/ts-jest/blob/25e1c63dd3797793b0f46fa52fdee580b46f66ae/src/transformers/hoist-jest.spec.ts
+ *
+ */
+
+import * as tsc from 'typescript';
+import * as transformer from '../StripStylesTransformer';
+
+const CODE_WITH_STYLES_AND_OTHER_ASSIGNMENTS = `
+  import { Component } from '@angular/core';
+
+  @SomeDecorator({
+    value: 'test',
+    styles: [
+      ':host { background-color: red }'
+    ],
+  })
+  @Component({
+    templateUrl: './page.html',
+    styleUrls: [
+      './fancy-styles.css',
+      './basic-styles.scss'
+    ],
+    styles: [
+      'body { display: none }',
+      'html { background-color: red }'
+    ],
+    unaffectedProperty: 'whatever'
+  })
+  export class AngularComponent {
+  }
+`;
+
+const CODE_WITH_ASSIGNMENT_OUTSIDE_DECORATOR = `
+  const assignmentsToNotBeTransformed = {
+    styles: [{
+      color: 'red'
+    }]
+  };
+`;
+
+const createFactory = () => {
+  return transformer.factory({ compilerModule: tsc } as any);
+};
+const transpile = (source: string) =>
+  tsc.transpileModule(source, { transformers: { before: [createFactory()] } });
+
+describe('inlining template and stripping styles', () => {
+  it('should have correct signature', () => {
+    expect(transformer.name).toBe('angular-component-strip-styles');
+    expect(typeof transformer.version).toBe('number');
+    expect(transformer.version).toBeGreaterThan(0);
+    expect(typeof transformer.factory).toBe('function');
+  });
+
+  it('should strip styleUrl assignment', () => {
+    const out = transpile(CODE_WITH_STYLES_AND_OTHER_ASSIGNMENTS);
+
+    expect(out.outputText).toMatchSnapshot();
+  });
+
+  it('should not transform styles outside decorator', () => {
+    const out = transpile(CODE_WITH_ASSIGNMENT_OUTSIDE_DECORATOR);
+
+    expect(out.outputText).toMatchSnapshot();
+  });
+});
diff --git a/...neHtmlStripStylesTransformer.test.ts.snap → ...ots__/InlineFilesTransformer.test.ts.snap b/...neHtmlStripStylesTransformer.test.ts.snap → ...ots__/InlineFilesTransformer.test.ts.snap
@@ -44,7 +44,10 @@ var AngularComponent = /** @class */ (function () {
         core_1.Component({
             template: require('./page.html'),
             styleUrls: [],
-            styles: [],
+            styles: [
+                'body: { display: none }',
+                'html: { background-color: red }'
+            ],
             unaffectedProperty: 'whatever'
         }),
         SomeOtherDecorator({
@@ -133,6 +136,19 @@ exports.AngularComponent = AngularComponent;
 "
 `;
 
+exports[`inlining template and stripping styles should not transform styles outside decorator 1`] = `
+"var assignmentsToNotBeTransformed = {
+    styles: [{
+            color: 'red'
+        }]
+};
+var assignmentsToBeTransformed = {
+    styleUrls: [],
+    template: require('./some-styles.css')
+};
+"
+`;
+
 exports[`inlining template and stripping styles should strip styleUrl assignment 1`] = `
 "\\"use strict\\";
 var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
@@ -172,7 +188,10 @@ var AngularComponent = /** @class */ (function () {
     }
     AngularComponent = __decorate([
         core_1.Component({
-            styles: []
+            styles: [
+                'body: { display: none }',
+                'html: { background-color: red }'
+            ]
         })
     ], AngularComponent);
     return AngularComponent;

diff --git a/__tests__/__snapshots__/StripStylesTransformer.test.ts.snap b/__tests__/__snapshots__/StripStylesTransformer.test.ts.snap
@@ -0,0 +1,46 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`inlining template and stripping styles should not transform styles outside decorator 1`] = `
+"var assignmentsToNotBeTransformed = {
+    styles: [{
+            color: 'red'
+        }]
+};
+"
+`;
+
+exports[`inlining template and stripping styles should strip styleUrl assignment 1`] = `
+"\\"use strict\\";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === \\"object\\" && typeof Reflect.decorate === \\"function\\") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+Object.defineProperty(exports, \\"__esModule\\", { value: true });
+var core_1 = require(\\"@angular/core\\");
+var AngularComponent = /** @class */ (function () {
+    function AngularComponent() {
+    }
+    AngularComponent = __decorate([
+        SomeDecorator({
+            value: 'test',
+            styles: [
+                ':host { background-color: red }'
+            ],
+        }),
+        core_1.Component({
+            templateUrl: './page.html',
+            styleUrls: [
+                './fancy-styles.css',
+                './basic-styles.scss'
+            ],
+            styles: [],
+            unaffectedProperty: 'whatever'
+        })
+    ], AngularComponent);
+    return AngularComponent;
+}());
+exports.AngularComponent = AngularComponent;
+"
+`;
diff --git a/jest-preset.js b/jest-preset.js
@@ -3,7 +3,10 @@ module.exports = {
     'ts-jest': {
       tsConfig: '<rootDir>/src/tsconfig.spec.json',
       stringifyContentPathRegex: '\\.html$',
-      astTransformers: [require.resolve('./InlineHtmlStripStylesTransformer')],
+      astTransformers: [
+        './InlineFilesTransformer',
+        './StripStylesTransformer',
+      ],
     },
   },
   transform: {