Patch os.arch() to fix Puppeteer issue on Apple M1

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Compatibility with Apple Silicon ([#301](https://github.com/marp-team/marp-cli/issues/301), [#305](https://github.com/marp-team/marp-cli/pull/305))
+
 ## v0.22.0 - 2020-10-18
 
 ### Added

src/converter.ts

@@ -21,6 +21,7 @@ import { ThemeSet } from './theme'
 import {
   generatePuppeteerDataDirPath,
   generatePuppeteerLaunchArgs,
+  launchPuppeteer,
 } from './utils/puppeteer'
 import { isChromeInWSLHost, resolveWSLPathToHost } from './utils/wsl'
 import { notifier } from './watcher'
@@ -461,7 +462,7 @@ export class Converter {
     if (!Converter.browser) {
       const baseArgs = generatePuppeteerLaunchArgs()
 
-      Converter.browser = await puppeteer.launch({
+      Converter.browser = await launchPuppeteer({
         ...baseArgs,
         userDataDir: await generatePuppeteerDataDirPath('marp-cli-conversion', {
           wslHost: isChromeInWSLHost(baseArgs.executablePath),

src/preview.ts

@@ -9,6 +9,7 @@ import { File, FileType } from './file'
 import {
   generatePuppeteerDataDirPath,
   generatePuppeteerLaunchArgs,
+  launchPuppeteer,
 } from './utils/puppeteer'
 import TypedEventEmitter from './utils/typed-event-emitter'
 import { isChromeInWSLHost } from './utils/wsl'
@@ -135,7 +136,7 @@ export class Preview extends TypedEventEmitter<Preview.Events> {
   private async launch() {
     const baseArgs = generatePuppeteerLaunchArgs()
 
-    this.puppeteerInternal = await puppeteer.launch({
+    this.puppeteerInternal = await launchPuppeteer({
       ...baseArgs,
       args: [
         ...baseArgs.args,

src/utils/puppeteer.ts

@@ -1,6 +1,7 @@
 import os from 'os'
 import path from 'path'
 import { Launcher } from 'chrome-launcher'
+import puppeteer from 'puppeteer-core'
 import { warn } from '../cli'
 import { CLIErrorCode, error } from '../error'
 import { findEdgeInstallation } from './edge-finder'
@@ -73,3 +74,22 @@ export const generatePuppeteerLaunchArgs = () => {
       : undefined,
   }
 }
+
+export const launchPuppeteer = (
+  ...args: Parameters<typeof puppeteer['launch']>
+) => {
+  const { arch } = os
+
+  try {
+    os.arch = () => {
+      // Patch for Apple M1 (arm64)
+      // @see https://github.com/puppeteer/puppeteer/issues/6634
+      if (process.platform === 'darwin' && arch() === 'arm64') return 'x64'
+      return arch()
+    }
+
+    return puppeteer.launch(...args)
+  } finally {
+    os.arch = arch
+  }
+}