fix: make more files work in strict-mode TypeScript

package.json

@@ -80,6 +80,7 @@
     "@types/mime": "2.0.3",
     "@types/mocha": "9.0.0",
     "@types/node": "16.10.9",
+    "@types/progress": "2.0.5",
     "@types/proxy-from-env": "1.0.1",
     "@types/rimraf": "3.0.2",
     "@types/sinon": "10.0.4",

src/initialize-node.ts

@@ -34,6 +34,10 @@ export const initializePuppeteerNode = (packageName: string): PuppeteerNode => {
   if (!isPuppeteerCore && productName === 'firefox')
     preferredRevision = PUPPETEER_REVISIONS.firefox;
 
+  if (!puppeteerRootDirectory) {
+    throw new Error('puppeteerRootDirectory is not found.');
+  }
+
   return new PuppeteerNode({
     projectRoot: puppeteerRootDirectory,
     preferredRevision,

src/node/Launcher.ts

@@ -42,9 +42,9 @@ const tmpDir = () => process.env.PUPPETEER_TMP_DIR || os.tmpdir();
  * @public
  */
 export interface ProductLauncher {
-  launch(object: PuppeteerNodeLaunchOptions);
-  executablePath: (string?) => string;
-  defaultArgs(object: BrowserLaunchArgumentOptions);
+  launch(object: PuppeteerNodeLaunchOptions): Promise<Browser>;
+  executablePath: (path?: any) => string;
+  defaultArgs(object: BrowserLaunchArgumentOptions): string[];
   product: Product;
 }
 
@@ -157,6 +157,10 @@ class ChromeLauncher implements ProductLauncher {
       }
     }
 
+    if (!chromeExecutable) {
+      throw new Error('chromeExecutable is not found.');
+    }
+
     const usePipe = chromeArguments.includes('--remote-debugging-pipe');
     const runner = new BrowserRunner(
       this.product,
@@ -187,7 +191,7 @@ class ChromeLauncher implements ProductLauncher {
         [],
         ignoreHTTPSErrors,
         defaultViewport,
-        runner.proc,
+        runner.proc ?? undefined,
         runner.close.bind(runner)
       );
     } catch (error) {
@@ -364,6 +368,10 @@ class FirefoxLauncher implements ProductLauncher {
       firefoxExecutable = executablePath;
     }
 
+    if (!firefoxExecutable) {
+      throw new Error('firefoxExecutable is not found.');
+    }
+
     const runner = new BrowserRunner(
       this.product,
       firefoxExecutable,
@@ -786,7 +794,7 @@ function resolveExecutablePath(launcher: ChromeLauncher | FirefoxLauncher): {
   executablePath: string;
   missingText?: string;
 } {
-  let downloadPath: string;
+  let downloadPath: string | undefined;
   // puppeteer-core doesn't take into account PUPPETEER_* env variables.
   if (!launcher._isPuppeteerCore) {
     const executablePath =
@@ -797,7 +805,7 @@ function resolveExecutablePath(launcher: ChromeLauncher | FirefoxLauncher): {
       const missingText = !fs.existsSync(executablePath)
         ? 'Tried to use PUPPETEER_EXECUTABLE_PATH env variable to launch browser but did not find any executable at: ' +
           executablePath
-        : null;
+        : undefined;
       return { executablePath, missingText };
     }
     downloadPath =
@@ -817,7 +825,7 @@ function resolveExecutablePath(launcher: ChromeLauncher | FirefoxLauncher): {
       const missingText = !revisionInfo.local
         ? 'Tried to use PUPPETEER_CHROMIUM_REVISION env variable to launch browser but did not find executable at: ' +
           revisionInfo.executablePath
-        : null;
+        : undefined;
       return { executablePath: revisionInfo.executablePath, missingText };
     }
   }
@@ -829,7 +837,7 @@ function resolveExecutablePath(launcher: ChromeLauncher | FirefoxLauncher): {
     ? `Could not find expected browser (${launcher.product}) locally. ${
         launcher.product === 'chrome' ? chromeHelp : firefoxHelp
       }`
-    : null;
+    : undefined;
   return { executablePath: revisionInfo.executablePath, missingText };
 }
 

src/node/Puppeteer.ts

@@ -66,7 +66,7 @@ import { Product } from '../common/Product.js';
  * @public
  */
 export class PuppeteerNode extends Puppeteer {
-  private _lazyLauncher: ProductLauncher;
+  private _lazyLauncher?: ProductLauncher;
   private _projectRoot: string;
   private __productName?: Product;
   /**
@@ -108,12 +108,12 @@ export class PuppeteerNode extends Puppeteer {
   /**
    * @internal
    */
-  get _productName(): Product {
+  get _productName(): Product | undefined {
     return this.__productName;
   }
 
   // don't need any TSDoc here - because the getter is internal the setter is too.
-  set _productName(name: Product) {
+  set _productName(name: Product | undefined) {
     if (this.__productName !== name) this._changedProduct = true;
     this.__productName = name;
   }

src/node/install.ts

@@ -31,16 +31,24 @@ const supportedProducts = {
   firefox: 'Firefox Nightly',
 } as const;
 
+function getProduct(input: string): 'chrome' | 'firefox' {
+  if (input !== 'chrome' && input !== 'firefox') {
+    throw new Error(`Unsupported product ${input}`);
+  }
+  return input;
+}
+
 export async function downloadBrowser(): Promise<void> {
   const downloadHost =
     process.env.PUPPETEER_DOWNLOAD_HOST ||
     process.env.npm_config_puppeteer_download_host ||
     process.env.npm_package_config_puppeteer_download_host;
-  const product =
+  const product = getProduct(
     process.env.PUPPETEER_PRODUCT ||
-    process.env.npm_config_puppeteer_product ||
-    process.env.npm_package_config_puppeteer_product ||
-    'chrome';
+      process.env.npm_config_puppeteer_product ||
+      process.env.npm_package_config_puppeteer_product ||
+      'chrome'
+  );
   const downloadPath =
     process.env.PUPPETEER_DOWNLOAD_PATH ||
     process.env.npm_config_puppeteer_download_path ||
@@ -53,7 +61,7 @@ export async function downloadBrowser(): Promise<void> {
   const revision = await getRevision();
   await fetchBinary(revision);
 
-  function getRevision() {
+  async function getRevision(): Promise<string> {
     if (product === 'chrome') {
       return (
         process.env.PUPPETEER_CHROMIUM_REVISION ||
@@ -72,7 +80,7 @@ export async function downloadBrowser(): Promise<void> {
     }
   }
 
-  function fetchBinary(revision) {
+  function fetchBinary(revision: string) {
     const revisionInfo = browserFetcher.revisionInfo(revision);
 
     // Do nothing if the revision is already downloaded.
@@ -119,9 +127,9 @@ export async function downloadBrowser(): Promise<void> {
       process.exit(1);
     }
 
-    let progressBar = null;
+    let progressBar: ProgressBar | null = null;
     let lastDownloadedBytes = 0;
-    function onProgress(downloadedBytes, totalBytes) {
+    function onProgress(downloadedBytes: number, totalBytes: number) {
       if (!progressBar) {
         progressBar = new ProgressBar(
           `Downloading ${
@@ -147,12 +155,12 @@ export async function downloadBrowser(): Promise<void> {
       .catch(onError);
   }
 
-  function toMegabytes(bytes) {
+  function toMegabytes(bytes: number) {
     const mb = bytes / 1024 / 1024;
     return `${Math.round(mb * 10) / 10} Mb`;
   }
 
-  function getFirefoxNightlyVersion() {
+  async function getFirefoxNightlyVersion(): Promise<string> {
     const firefoxVersionsUrl =
       'https://product-details.mozilla.org/1.0/firefox_versions.json';
 
@@ -172,14 +180,14 @@ export async function downloadBrowser(): Promise<void> {
       requestOptions.rejectUnauthorized = false;
     }
 
-    const promise = new Promise((resolve, reject) => {
+    const promise = new Promise<string>((resolve, reject) => {
       let data = '';
       logPolitely(
         `Requesting latest Firefox Nightly version from ${firefoxVersionsUrl}`
       );
       https
         .get(firefoxVersionsUrl, requestOptions, (r) => {
-          if (r.statusCode >= 400)
+          if (r.statusCode && r.statusCode >= 400)
             return reject(new Error(`Got status code ${r.statusCode}`));
           r.on('data', (chunk) => {
             data += chunk;
@@ -200,7 +208,7 @@ export async function downloadBrowser(): Promise<void> {
 }
 
 export function logPolitely(toBeLogged: unknown): void {
-  const logLevel = process.env.npm_config_loglevel;
+  const logLevel = process.env.npm_config_loglevel || '';
   const logLevelDisplay = ['silent', 'error', 'warn'].indexOf(logLevel) > -1;
 
   // eslint-disable-next-line no-console