Proxy環境下でElectron7系以降をnpm installするとENOTFOUND github.comエラーになるのを解消する

$ git clone https://github.com/electron/electron-quick-start
$ cd electron-quick-start
$ cat package.json
{
  "name": "electron-quick-start",
  "version": "1.0.0",
  "description": "A minimal Electron application",
  "main": "main.js",
  "scripts": {
    "start": "electron ."
  },
  "repository": "https://github.com/electron/electron-quick-start",
  "keywords": [
    "Electron",
    "quick",
    "start",
    "tutorial",
    "demo"
  ],
  "author": "GitHub",
  "license": "CC0-1.0",
  "devDependencies": {
    "electron": "^8.0.3"
  }
}
$ npm install

> [email protected] postinstall /Users/geekduck/Downloads/electron-quick-start/node_modules/core-js
> node -e "try{require('./postinstall')}catch(e){}"


> [email protected] postinstall /Users/geekduck/Downloads/electron-quick-start/node_modules/electron
> node install.js

(node:54108) UnhandledPromiseRejectionWarning: RequestError: getaddrinfo ENOTFOUND github.com
    at ClientRequest.<anonymous> (/Users/geekduck/Downloads/electron-quick-start/node_modules/got/source/request-as-event-emitter.js:178:14)
    at Object.onceWrapper (events.js:423:26)
    at ClientRequest.emit (events.js:328:22)
    at ClientRequest.EventEmitter.emit (domain.js:485:12)
    at ClientRequest.origin.emit (/Users/geekduck/Downloads/electron-quick-start/node_modules/@szmarczak/http-timer/source/index.js:37:11)
    at TLSSocket.socketErrorListener (_http_client.js:432:9)
    at TLSSocket.emit (events.js:316:20)
    at TLSSocket.EventEmitter.emit (domain.js:485:12)
    at emitErrorNT (internal/streams/destroy.js:84:8)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)
(node:54108) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:54108) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
added 86 packages from 96 contributors and audited 103 packages in 33.644s

2 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

ELECTRON_GET_USE_PROXY ... Electron本体のダウンロード時にプロキシを使うかどうか
GLOBAL_AGENT_HTTP_PROXY ... Electron本体のダウンロード時に使用するhttpプロキシ
GLOBAL_AGENT_HTTPS_PROXY ... Electron本体のダウンロード時に使用するhttpsプロキシ

export ELECTRON_GET_USE_PROXY=1 # 値は1でもtrueでもなんでも良い
export GLOBAL_AGENT_HTTP_PROXY=http://proxy.example.com:8080
export GLOBAL_AGENT_HTTPS_PROXY=https://proxy.example.com:8080

set -x ELECTRON_GET_USE_PROXY 1 # 値は1でもtrueでもなんでも良い
set -x GLOBAL_AGENT_HTTP_PROXY http://proxy.example.com:8080
set -x GLOBAL_AGENT_HTTPS_PROXY https://proxy.example.com:8080