lighthouse | Automated auditing , performance metrics | Performance Testing library

 by   GoogleChrome JavaScript Version: 11.3.0 License: Apache-2.0

kandi X-RAY | lighthouse Summary

kandi X-RAY | lighthouse Summary

lighthouse is a JavaScript library typically used in Telecommunications, Media, Media, Entertainment, Testing, Performance Testing applications. lighthouse has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i wb-lighthouse' or download it from GitHub, npm.

Lighthouse analyzes web apps and web pages, collecting modern performance metrics and insights on developer best practices.

            kandi-support Support

              lighthouse has a medium active ecosystem.
              It has 26659 star(s) with 9363 fork(s). There are 595 watchers for this library.
              There were 10 major release(s) in the last 6 months.
              There are 570 open issues and 8122 have been closed. On average issues are closed in 199 days. There are 62 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of lighthouse is 11.3.0

            kandi-Quality Quality

              lighthouse has 0 bugs and 0 code smells.

            kandi-Security Security

              lighthouse has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              lighthouse code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              lighthouse is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              lighthouse releases are available to install and integrate.
              Deployable package is available in npm.
              Installation instructions are not available. Examples and code snippets are available.
              lighthouse saves you 2043 person hours of effort in developing the same functionality from scratch.
              It has 5882 lines of code, 1 functions and 1020 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed lighthouse and discovered the below as its top functions. This is intended to give you an instant insight into lighthouse implemented functionality, and help decide if they suit your requirements.
            • Get LONG flags .
            • Create the topbar component component
            • Converts the trace timestamps array to a trace event stream .
            • build bundle bundle
            • Determines the number of tokens for a given content
            • Run the config .
            • Creates a pw gauge component
            • Compiles the template names of elements .
            • Run a test in a page .
            • Initialize the sender .
            Get all kandi verified functions for this library.

            lighthouse Key Features

            No Key Features are available at this moment for lighthouse.

            lighthouse Examples and Code Snippets

            How to send Google Lighthouse reports to Slack using PageSpeedInsights API and Google Apps Script
            JavaScriptdot img1Lines of Code : 111dot img1License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            var mobileData = fetchDataFromPSI('mobile');
            var desktopData = fetchDataFromPSI('desktop');
            function pageSpeedApiEndpointUrl(strategy) {
              const apiBaseUrl = '';
              const websiteHom
            URL Encoding using a loop
            JavaScriptdot img2Lines of Code : 29dot img2License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            def urlEncode(text):
                result = ''
                for i in text:
                    if i == ' ':
                        i = '%20'
                        result += i
                        result += i
                return result
            print(urlEncode("Lighthouse Labs"))
            print(urlEncode(" Ligh
            How to pass array inputs as parameter to async function?
            JavaScriptdot img3Lines of Code : 35dot img3License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            const fs = require('fs');
            const util = require('util');
            const readFile = util.promisify(fs.readFile);
            async function getUrlsFromFile {
              const contents = await readFile('urls.txt');
              return lines.toString().split('\n')
            async function 
            New to applescript
            JavaScriptdot img4Lines of Code : 11dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            set srcFolder to "/Users/user/Documents/Lighthouse/"
            set srcFile to srcFolder & "urls.txt"
            set outputPath to quoted form of (srcFolder & "LighthouseReports.csv")
            set lns to paragraphs of (read file srcFile as «class utf8»)
            How to upload the Lighthouse CI results as GitHub status checks?
            JavaScriptdot img5Lines of Code : 12dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            # ...
                # other stages...
                - stage: lighthouse
                    - yarn build
                    - lhci autorun
                    chrome: stable
            docker volume not found for configuration option
            JavaScriptdot img6Lines of Code : 9dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            docker run --rm --name lighthouse -it \
              -v $PWD/test-results/lighthouse:/home/chrome/reports \
              -v $PWD/lighthouse:/lighthouse \
              --cap-add=SYS_ADMIN femtopixel/google-lighthouse \
              $full_url \
            How to set a custom configuration in Lighthouse programmaticaly?
            JavaScriptdot img7Lines of Code : 38dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            // This how I call lighthouse programmatically
            const lhr = await lighthouse(url, config.lighthouseFlags, config.lighthouseConfigs);
            var url = "";
            var config = {};
            // The 2nd parameter in the lighthouse function is s

            Community Discussions


            All elements of the page move after changing the size of the window
            Asked 2022-Apr-15 at 18:37

            I am new to coding, my code moves when I change the size of the browser window (divs and pictures start moving up and down and as a result my web page can only be correctly visible in one window size.

            What should I change to adapt the page to different screen sizes?

            Please let me know if I have some other mistakes in the code as well.

            Here is the code:



            Answered 2022-Apr-15 at 18:37

            You can use Media Queries to target different device viewports and apply specific styling. You can read more about responsive styling and viewports here and here



            Node.js Lighthouse custom Gatherer/Audit - Protocol error (Runtime.evaluate): Object reference chain is too long
            Asked 2022-Apr-04 at 07:27

            I am trying to implement custom audits using the lighthouse library lighthouse and executing some Javascript commands within the Gatherer I get the following error:



            Answered 2022-Apr-04 at 07:27

            There is already an artifact that collects all font information on a page:

            As for the actual error, you'd need to write a more complex function that you'd pass to evaluate to process the DOM and return only the data you want. If you write anything more than a single-line expression I suggest using driver.evaluate instead (see the Lighthouse repo for examples).



            How to calculate percentages from multiple columns
            Asked 2022-Apr-04 at 03:06

            I want to create a table that looks like this:

            So far I have a table I created to get the value counts but I need help with creating a table that calculates the total value of row 0 and 1. I'm using this dataset:




            Answered 2022-Apr-02 at 03:26


            Nuxt Seo meta-description
            Asked 2022-Mar-22 at 14:38

            I'm following the documentation for seo of in a netifly hosted nuxt project

            the problem when i run the lighthouse checker in chrome it says the meta description is empty ( apeears in the head of the html ).

            when i retieve a especific post directly all checks are red.

            in google search typing "estudios claw" only appears the navbar titles.

            I have set all my meta description individually depending the page.




            Answered 2022-Mar-22 at 14:38

            You need to generate a meta tag like . Your code would not do that. The example code you linked to shows that both the hid and the name should be "description" (literally.) You appear to be putting the page title into the name attribute of the tag, which is not correct. Correct code should be more like:



            How can I count files in folder
            Asked 2022-Mar-11 at 03:55

            I would like to count the files in folder with Excel VBA.

            The speed very important for me now, so first I list all files (from folders and subfolders) to "A" column, and I would like to go thru on all lines and count how many files in the folder.

            My list from "A" column:



            Answered 2022-Mar-10 at 11:11

            You don't need VBA for this, standard Excel functions can compute these counts.

            Column B is used to extract the filename from the path:



            How to fetch data from endpoint in Sveltekit version v1.0.0-next.287
            Asked 2022-Mar-04 at 07:55

            Yesterday I updated SvelteKit version from v1.0.0-next.241 to v1.0.0-next.287, and since I cannot fetch data in the component. I get an error message: Unexpected token < in JSON at position 0. Error occurs when I try to parse response: await response.json() Did anything change regarding fetching data since version 241? And how to do it now?




            Answered 2022-Mar-04 at 07:55

            You have to add accept headers as well to indicate to the server what you accept as a return, by default this is html.



            Javascript Lighthouse Hack?
            Asked 2022-Mar-02 at 05:39

            My Company Hired someone outside on up upwork for cheap to optimize for lighthouse score. He asked me to review what they did and I'm trying to figure out exactly what they did. Our scores definitely went up but it looks like a special set of rules for lighthouse-chrome and GTMetrix agents that ignore certain things in order to get a better score.

            Can anyone decipher this and tell me if this is just a hack or legit?



            Answered 2022-Mar-02 at 05:39

            This appears to be a scam.

            Searching for that code, I can find similar code here and here.

            The code is intentionally difficult to read, but the idea appears to be that when it detects that page speed is being measured (seemingly by checking the User-Agent string), it loads an empty page; which will obviously be faster. I'm not sure what it's doing with script and link tags, so this variant might be a little different, but that's what they're reporting on Shopify.

            I would be extremely suspicious based on that first line alone though. Any time you have strings with information that's encoded oddly embedded in the string, there's the potential that it's being used to hide information. Here, they appear to be trying to hide the fact that they're checking the user-agent string for 'Chrome-Lighthouse' ('\x43\x68\x72\x6F\x6D\x65\x2D\x4C\x69\x67\x68\x74\x68\x6F\x75\x73\x65'), but it could have also been code that stole session cookies, or replaced links on pages to point to malicious sites. Be very cautious of code that appears to be evading human or other static detection.



            How to send api response compressed in nuxt.js
            Asked 2022-Feb-23 at 11:58

            Chrome Lighthouse tells me that I could save like 90% of the transfered bytes by compressing my api route

            How could I modify this code (api/something.js) to enable compression?



            Answered 2022-Feb-23 at 11:58
            Option 1: Express & compression middleware

            If you make the server middleware extend Express, then you can use the compression middleware to handle compression of HTTP responses:

            For example:



            cy.lighthouse and cy.pa11y not working in files like .spec.ts or .ts
            Asked 2022-Jan-31 at 07:55

            I wanted to make a lighthouse test using cypress-audit, but after doing everything they said on it doesn't work. I can use "cy.lighthouse()" in the cypress/support/commands.js, but not in files with extension like .spec.ts or .ts ( i get "Property 'lighthouse' does not exist on type 'cy & EventEmitter'.ts(2339)" error ). I already tried to find any solutions on the internet, but nothing worked.




            Answered 2022-Jan-26 at 11:12

            There are some type defs in the cypress-audit package that should be kicking in. Perhaps it's the mixture of ts and js files?

            Try adding these to /cypress/support/index.ts



            Accessibility compliance of specific table HTML
            Asked 2022-Jan-28 at 11:19

            I have an HTML layout engine that has a common component that can switch between ol HTML, ul HTML, and table HTML structure



            Answered 2021-Dec-09 at 00:37

            I don't think the

            WCAG 4.1.1html spec for structure is valid, which would violate . The says the content model is "Zero or more td, th, and script-supporting elements", where "script supporting" is defined here, , which is essentially the


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install lighthouse

            You can install using 'npm i wb-lighthouse' or download it from GitHub, npm.


            We'd love help writing audits, fixing bugs, and making the tool more useful! See Contributing to get started. Lighthouse, ˈlītˌhous (n): a tower or other structure tool containing a beacon light to warn or guide ships at sea developers.
            Find more information at:

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          • npm

            npm i lighthouse

          • CLONE
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          • CLI

            gh repo clone GoogleChrome/lighthouse

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