|
1 | | -const puppeteer = require("puppeteer"); |
| 1 | +const puppeteer = require('puppeteer') |
2 | 2 |
|
3 | | -function InvalidUrlError({ url, statusCode, statusText }) { |
4 | | - this.name = "InvalidUrlError"; |
5 | | - this.message = `There was an error retrieving CSS from ${url}.\n\tHTTP status code: ${statusCode} (${statusText})`; |
| 3 | +function InvalidUrlError({url, statusCode, statusText}) { |
| 4 | + this.name = 'InvalidUrlError' |
| 5 | + this.message = `There was an error retrieving CSS from ${url}.\n\tHTTP status code: ${statusCode} (${statusText})` |
6 | 6 | } |
7 | 7 |
|
8 | | -InvalidUrlError.prototype = Error.prototype; |
| 8 | +InvalidUrlError.prototype = Error.prototype |
9 | 9 |
|
10 | 10 | module.exports = async ( |
11 | | - url, |
12 | | - { debug = false, waitUntil = "networkidle2", customBrowser = {} } = {} |
| 11 | + url, |
| 12 | + {debug = false, waitUntil = 'networkidle2', customBrowser = {}} = {} |
13 | 13 | ) => { |
14 | | - const browserOptions = { |
15 | | - headless: debug !== true, |
16 | | - puppeteer |
17 | | - }; |
| 14 | + const browserOptions = { |
| 15 | + headless: debug !== true, |
| 16 | + puppeteer |
| 17 | + } |
18 | 18 |
|
19 | | - // Replace the puppeteer instance if a custom one is provided |
20 | | - // This also means that the executablePath needs to be set to |
21 | | - // a custom path where some chromium instance is running. |
22 | | - if ( |
23 | | - customBrowser && |
24 | | - customBrowser.executablePath && |
25 | | - customBrowser.customPuppeteer |
26 | | - ) { |
27 | | - browserOptions.executablePath = customBrowser.executablePath; |
28 | | - browserOptions.puppeteer = customBrowser.customPuppeteer; |
29 | | - } |
| 19 | + // Replace the puppeteer instance if a custom one is provided |
| 20 | + // This also means that the executablePath needs to be set to |
| 21 | + // a custom path where some chromium instance is running. |
| 22 | + if ( |
| 23 | + customBrowser && |
| 24 | + customBrowser.executablePath && |
| 25 | + customBrowser.customPuppeteer |
| 26 | + ) { |
| 27 | + browserOptions.executablePath = customBrowser.executablePath |
| 28 | + browserOptions.puppeteer = customBrowser.customPuppeteer |
| 29 | + } |
30 | 30 |
|
31 | | - // Setup a browser instance |
32 | | - const browser = await browserOptions.puppeteer.launch(browserOptions); |
| 31 | + // Setup a browser instance |
| 32 | + const browser = await browserOptions.puppeteer.launch(browserOptions) |
33 | 33 |
|
34 | | - // Create a new page and navigate to it |
35 | | - const page = await browser.newPage(); |
| 34 | + // Create a new page and navigate to it |
| 35 | + const page = await browser.newPage() |
36 | 36 |
|
37 | | - // Start CSS coverage. This is the meat and bones of this module |
38 | | - await page.coverage.startCSSCoverage(); |
39 | | - const response = await page.goto(url, { waitUntil }); |
| 37 | + // Start CSS coverage. This is the meat and bones of this module |
| 38 | + await page.coverage.startCSSCoverage() |
| 39 | + const response = await page.goto(url, {waitUntil}) |
40 | 40 |
|
41 | | - // Make sure that we only try to extract CSS from valid pages. |
42 | | - // Bail out if the response is an invalid request (400, 500) |
43 | | - if (response.status() >= 400) { |
44 | | - await browser.close(); // Don't leave any resources behind |
| 41 | + // Make sure that we only try to extract CSS from valid pages. |
| 42 | + // Bail out if the response is an invalid request (400, 500) |
| 43 | + if (response.status() >= 400) { |
| 44 | + await browser.close() // Don't leave any resources behind |
45 | 45 |
|
46 | | - return Promise.reject( |
47 | | - new InvalidUrlError({ |
48 | | - url, |
49 | | - statusCode: response.status(), |
50 | | - statusText: response.statusText() |
51 | | - }) |
52 | | - ); |
53 | | - } |
| 46 | + return Promise.reject( |
| 47 | + new InvalidUrlError({ |
| 48 | + url, |
| 49 | + statusCode: response.status(), |
| 50 | + statusText: response.statusText() |
| 51 | + }) |
| 52 | + ) |
| 53 | + } |
54 | 54 |
|
55 | | - // Coverage contains a lot of <style> and <link> CSS, |
56 | | - // but not all... |
57 | | - const coverage = await page.coverage.stopCSSCoverage(); |
| 55 | + // Coverage contains a lot of <style> and <link> CSS, |
| 56 | + // but not all... |
| 57 | + const coverage = await page.coverage.stopCSSCoverage() |
58 | 58 |
|
59 | | - // Fetch all <style> tags from the page, because the coverage |
60 | | - // API may have missed some JS-generated <style> tags. |
61 | | - // Some of them *were* already caught by the coverage API, |
62 | | - // but they will be removed later on to prevent duplicates. |
63 | | - const styleTagsCss = (await page.$$eval("style", styles => { |
64 | | - // Get the text inside each <style> tag and trim() the |
65 | | - // results to prevent all the inside-html indentation |
66 | | - // clogging up the results and making it look |
67 | | - // bigger than it actually is |
68 | | - return styles.map(style => style.innerHTML.trim()); |
69 | | - })).join(""); |
| 59 | + // Fetch all <style> tags from the page, because the coverage |
| 60 | + // API may have missed some JS-generated <style> tags. |
| 61 | + // Some of them *were* already caught by the coverage API, |
| 62 | + // but they will be removed later on to prevent duplicates. |
| 63 | + const styleTagsCss = (await page.$$eval('style', styles => { |
| 64 | + // Get the text inside each <style> tag and trim() the |
| 65 | + // results to prevent all the inside-html indentation |
| 66 | + // clogging up the results and making it look |
| 67 | + // bigger than it actually is |
| 68 | + return styles.map(style => style.innerHTML.trim()) |
| 69 | + })).join('') |
70 | 70 |
|
71 | | - await browser.close(); |
| 71 | + await browser.close() |
72 | 72 |
|
73 | | - // Turn the coverage Array into a single string of CSS |
74 | | - const coverageCss = coverage |
75 | | - // Filter out the <style> tags that were found in the coverage |
76 | | - // report since we've conducted our own search for them. |
77 | | - // A coverage CSS item with the same url as the url of the page |
78 | | - // we requested is an indication that this was a <style> tag |
79 | | - .filter(styles => styles.url !== url) |
80 | | - // The `text` property contains the actual CSS |
81 | | - .map(({ text }) => text) |
82 | | - .join(""); |
| 73 | + // Turn the coverage Array into a single string of CSS |
| 74 | + const coverageCss = coverage |
| 75 | + // Filter out the <style> tags that were found in the coverage |
| 76 | + // report since we've conducted our own search for them. |
| 77 | + // A coverage CSS item with the same url as the url of the page |
| 78 | + // we requested is an indication that this was a <style> tag |
| 79 | + .filter(styles => styles.url !== url) |
| 80 | + // The `text` property contains the actual CSS |
| 81 | + .map(({text}) => text) |
| 82 | + .join('') |
83 | 83 |
|
84 | | - return Promise.resolve(coverageCss + styleTagsCss); |
85 | | -}; |
| 84 | + return Promise.resolve(coverageCss + styleTagsCss) |
| 85 | +} |
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