v27.3.0

Added

• browsertime --help is now navigable by topic. The default view shows a short curated list of common options plus the available topic names. browsertime --help <topic> shows just that topic, and browsertime --help-all reproduces the historical full dump for scripts and power users. The old single-screen dump of every option from all 13 topic groups was overwhelming for new users and slow to skim; the topic-filtered view follows the curl/ffmpeg pattern #2467.

Fixed

• TypeScript types and IntelliSense for navigation scripts are tightened across the script-facing surface. A new BrowsertimeScript type alias lets scripts annotate their default export and get both context and commands typed in one line. The high-level command helpers (navigate, find, getText, fill, hover, press, getTitle, waitForUrl, …) now surface their JSDoc parameter and return types in IntelliSense instead of being typed as Function, and commands.find resolves to a real WebElement so chained calls get completion from selenium-webdriver #2476. context.options, context.result, and context.taskData are typed as Record<string, any> so editors offer completion on context.options. etc. #2478. commands.mouse is now a proper shape (selector typed as string, singleClick's options surface waitForNavigation) instead of an anonymous object literal, and measure.stop / measure.clickAndMeasure / measure.stopAsError return types are explicit (Promise<void> / Promise<unknown>) instead of Promise<any> #2479.
• How Browsertime publishes its TypeScript types is now safer. scripting.d.ts moved to the repo root next to package.json so it can't be clobbered by a future tsc outDir change, the types condition comes first under exports to match TypeScript's documented resolution rules, and publint runs as part of prepublishOnly so common package.json mistakes fail before a release goes out #2477.
• Replaced the direct lodash.merge dependency with a small in-tree merge() helper in lib/support/util.js. The helper matches lodash's actual semantics for the cases Browsertime relies on — arrays merged by index, undefined source values skipped unless the key is missing on the target, Date/RegExp/class instances passed by reference, prototype-pollution keys rejected — which finishes the lodash unbundling the same way sitespeed.io did #2468.
• Bumped dependencies: chrome-har 1.3.1 #2469, chrome-remote-interface and selenium-webdriver #2475, @sitespeed.io/log 2.0 #2471, chromedriver / edgedriver / geckodriver #2472.