use puppeteer-core with chrome-launcher instead of puppeteer (#48)

core/command/pdf.js

@@ -1,5 +1,7 @@
 const chalk = require('chalk')
-const puppeteer = require('puppeteer')
+const puppeteer = require('puppeteer-core')
+const { getPlatform } = require('chrome-launcher/dist/utils.js')
+const chromeFinder = require('chrome-launcher/dist/chrome-finder.js')
 
 function evalCalcExpression (value) {
   const expression = value
@@ -11,7 +13,11 @@ function evalCalcExpression (value) {
 }
 
 async function handler ({ cwd, output }) {
-  let browser = await puppeteer.launch()
+  const executablePath = process.env.PUPPETEER_EXECUTABLE_PATH || (await (chromeFinder)[getPlatform()]())[0]
+  if (!executablePath) {
+    throw new Error('Chrome / Chromium is not installed or environment variable PUPPETEER_EXECUTABLE_PATH is not set')
+  }
+  let browser = await puppeteer.launch({ executablePath })
   let page = await browser.newPage()
 
   await page.goto(`file://${cwd}/index.html`)

package.json

@@ -46,6 +46,7 @@
   "dependencies": {
     "browser-sync": "^2.26.5",
     "chalk": "^2.4.2",
+    "chrome-launcher": "^0.12.0",
     "del": "^3.0.0",
     "execa": "^1.0.0",
     "gh-pages": "^2.0.1",
@@ -56,7 +57,7 @@
     "inquirer": "^6.3.1",
     "listr": "^0.14.3",
     "merge-stream": "^1.0.1",
-    "puppeteer": "^1.15.0",
+    "puppeteer-core": "^2.0.0",
     "semver": "^5.7.0",
     "tmp": "0.0.33",
     "update-notifier": "^2.5.0",

readme.md

@@ -88,6 +88,9 @@ Options:
 
 **`$ shower pdf` - Converts the presentation to PDF**
 
+The browser that [implements the Chrome Debugging Protocol](https://github.com/cyrus-and/chrome-remote-interface/#implementations) is required.
+If you installed Chrome / Chromium to the custom path or use another browser, set PUPPETEER_EXECUTABLE_PATH environment variable.
+
 ```
 Options:
   --output, -o   File name                       [string] [default: "index.pdf"]