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What's New In DevTools (Chrome 68)

New to DevTools in Chrome 68:

Read on, or watch the video version of the release notes, below.

Assistive Console

Chrome 68 ships with a few new Console features related to autocompletion and previewing.

Eager Evaluation

When you type an expression in the Console, the Console can now show a preview of the result of that expression below your cursor.

The Console is printing the result of the sort() operation before it has been explicitly executed.
Figure 1. The Console is printing the result of the sort() operation before it has been explicitly executed

To enable Eager Evaluation:

  1. Open the Console.
  2. Open Console Settings Console Settings.
  3. Enable the Eager evaluation checkbox.

DevTools does not eager evaluate if the expression causes side effects.

Argument hints

As you're typing out functions, the Console now shows you the arguments that the function expects.

Argument hints in the Console.
Figure 2. Various examples of argument hints in the Console

Notes:

  • A question mark before an arg, such as ?options, represents an optional arg.
  • An ellipsis before an arg, such as ...items, represents a spread.
  • Some functions, such as CSS.supports(), accept multiple argument signatures.

Autocomplete after function executions

After enabling Eager Evaluation, the Console now also shows you which properties and functions are available after you type out a function.

After running document.querySelector('p'), the Console can now show you the available properties and functions for that element.
Figure 3. The top screenshot represents the old behavior, and the bottom screenshot represents the new behavior that supports function autocompletion

ES2017 keywords in autocomplete

ES2017 keywords, such as await, are now available in the Console's autocomplete UI.

The Console now suggests 'await' in its autocomplete UI.
Figure 4. The Console now suggests await in its autocomplete UI

Faster, more reliable audits, a new UI, and new audits

Chrome 68 ships with Lighthouse 3.0. The next sections are a roundup of some of the biggest changes. See Announcing Lighthouse 3.0 for the full story.

Faster, more reliable audits

Lighthouse 3.0 has a new internal auditing engine, codenamed Lantern, which completes your audits faster, and with less variance between runs.

New UI

Lighthouse 3.0 also brings a new UI, thanks to a collaboration between the Lighthouse and Chrome UX (Research & Design) teams.

The new report UI in Lighthouse 3.0.
Figure 5. The new report UI in Lighthouse 3.0

New audits

Lighthouse 3.0 also ships with 4 new audits:

  • First Contentful Paint
  • robots.txt is not valid
  • Use video formats for animated content
  • Avoid multiple, costly round trips to any origin

BigInt support

Chrome 68 supports a new numeric primitive called BigInt. BigInt lets you represent integers with arbitrary precision. Try it out in the Console:

An example of BigInt in the Console.
Figure 6. An example of BigInt in the Console

Add property path to watch

While paused on a breakpoint, right-click a property in the Scope pane and select Add property path to watch to add that property to the Watch pane.

An example of Add property path to watch.
Figure 7. An example of Add property path to watch

"Show timestamps" moved to settings

The Show timestamps checkbox previously in Console Settings Console Settings has moved to Settings.

Feedback

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To discuss the new features and changes in this post, or anything else related to DevTools:

  • File bug reports at Chromium Bugs.
  • Discuss features and changes on the Mailing List. Please don't use the mailing list for support questions. Use Stack Overflow, instead.
  • Get help on how to use DevTools on Stack Overflow. Please don't file bugs on Stack Overflow. Use Chromium Bugs, instead.
  • Tweet us at @ChromeDevTools.
  • File bugs on this doc in the Web Fundamentals repository.

Consider Canary

If you're on Mac or Windows, please consider using Chrome Canary as your default development browser. If you report a bug or a change that you don't like while it's still in Canary, the DevTools team can address your feedback significantly faster.

Discover other DevTools features

Below is a list of everything that's been covered in the What's New In DevTools series.

Chrome 75

Chrome 74

Chrome 73

Chrome 72

Chrome 71

Chrome 70

Chrome 68

Chrome 67

Chrome 66

Chrome 65

Chrome 64

Chrome 63

Chrome 62

Chrome 61

Chrome 60

Chrome 59