chore: introduce injected source lazily evaluated by execution context (#42)

.eslintignore

@@ -9,4 +9,5 @@ node6-testrunner/*
 lib/
 *.js
 src/chromium/protocol.d.ts
+src/injected/injectedSource.ts
 src/webkit/protocol.d.ts

.gitignore

@@ -14,6 +14,7 @@ package-lock.json
 yarn.lock
 /node6
 /src/chromium/protocol.d.ts
+/src/injected/injectedSource.ts
 /src/webkit/protocol.d.ts
 /utils/browser/playwright-web.js
 /index.d.ts

package.json

@@ -24,8 +24,8 @@
     "doc": "node utils/doclint/cli.js",
     "coverage": "cross-env COVERAGE=true npm run unit",
     "tsc": "tsc -p .",
-    "build": "tsc -p .",
-    "watch": "tsc -w -p .",
+    "build": "npx webpack --config src/injected/webpack-injected.config.js --mode='production' && tsc -p .",
+    "watch": "npx webpack --config src/injected/webpack-injected.config.js --mode='development' --watch --silent | tsc -w -p .",
     "apply-next-version": "node utils/apply_next_version.js",
     "bundle": "npx browserify -r ./index.js:playwright -o utils/browser/playwright-web.js",
     "test-types": "node utils/doclint/generate_types && npx -p typescript@2.1 tsc -p utils/doclint/generate_types/test/",
@@ -62,7 +62,10 @@
     "pixelmatch": "^4.0.2",
     "pngjs": "^3.3.3",
     "text-diff": "^1.0.1",
-    "typescript": "3.6.3"
+    "ts-loader": "^6.1.2",
+    "typescript": "3.6.3",
+    "webpack": "^4.41.0",
+    "webpack-cli": "^3.3.9"
   },
   "browser": {
     "./lib/BrowserFetcher.js": false,

src/chromium/ExecutionContext.ts

@@ -22,7 +22,7 @@ import { assert, helper } from '../helper';
 import { valueFromRemoteObject, getExceptionMessage } from './protocolHelper';
 import { createJSHandle, ElementHandle, JSHandle } from './JSHandle';
 import { Protocol } from './protocol';
-
+import { injectedSource } from '../injected/injectedSource';
 
 export const EVALUATION_SCRIPT_URL = '__playwright_evaluation_script__';
 const SOURCE_URL_REGEX = /^[\040\t]*\/\/[@#] sourceURL=\s*(\S*?)\s*$/m;
@@ -30,6 +30,7 @@ const SOURCE_URL_REGEX = /^[\040\t]*\/\/[@#] sourceURL=\s*(\S*?)\s*$/m;
 export class ExecutionContext {
   _client: CDPSession;
   _world: DOMWorld;
+  private _injectedPromise: Promise<JSHandle> | null = null;
   private _contextId: number;
 
   constructor(client: CDPSession, contextPayload: Protocol.Runtime.ExecutionContextDescription, world: DOMWorld | null) {
@@ -159,4 +160,10 @@ export class ExecutionContext {
     });
     return createJSHandle(this, object) as ElementHandle;
   }
+
+  _injected(): Promise<JSHandle> {
+    if (!this._injectedPromise)
+      this._injectedPromise = this.evaluateHandle(injectedSource);
+    return this._injectedPromise;
+  }
 }

src/injected/injected.ts

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+class Utils {
+  parentElementOrShadowHost(element: Element): Element | undefined {
+    if (element.parentElement)
+      return element.parentElement;
+    if (!element.parentNode)
+      return;
+    if (element.parentNode.nodeType === Node.DOCUMENT_FRAGMENT_NODE && (element.parentNode as ShadowRoot).host)
+      return (element.parentNode as ShadowRoot).host;
+  }
+
+  deepElementFromPoint(document: Document, x: number, y: number): Element | undefined {
+    let container: Document | ShadowRoot | null = document;
+    let element: Element | undefined;
+    while (container) {
+      const innerElement = container.elementFromPoint(x, y) as Element | undefined;
+      if (!innerElement || element === innerElement)
+        break;
+      element = innerElement;
+      container = element.shadowRoot;
+    }
+    return element;
+  }
+}
+
+export const utils = new Utils();

src/injected/webpack-injected.config.js

@@ -0,0 +1,43 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+const fs = require('fs');
+const path = require('path');
+
+class InlineInjectedSource {
+  apply(compiler) {
+    compiler.hooks.emit.tapAsync('InlineInjectedSource', (compilation, callback) => {
+      const source = compilation.assets['injectedSource.js'].source();
+      const newSource = 'export const injectedSource = ' + JSON.stringify(source) + ';';
+      fs.writeFileSync(path.join(__dirname, 'injectedSource.ts'), newSource);
+      callback();
+    });
+  }
+}
+
+module.exports = {
+  entry: path.join(__dirname, 'injected.ts'),
+  devtool: 'source-map',
+  module: {
+    rules: [
+      {
+        test: /\.tsx?$/,
+        loader: 'ts-loader',
+        options: {
+          transpileOnly: true
+        },
+        exclude: /node_modules/
+      }
+    ]
+  },
+  resolve: {
+    extensions: [ '.tsx', '.ts', '.js' ]
+  },
+  output: {
+    filename: 'injectedSource.js',
+    path: path.resolve(__dirname, '../../lib/injected')
+  },
+  plugins: [
+    new InlineInjectedSource(),
+  ]
+};