斯维尔特给出错误"process is not defined"

Question

我正在创建一个苗条的应用程序，我想从。env访问变量。如果我输入

let dev = process.env.DEV_MODE;

在我的应用中我得到错误

Uncaught ReferenceError: process is not defined

我是不是漏了什么包裹?

.env

DEV_MODE=true;

package.json

{
"name": "svelte-app",
"version": "1.0.0",
"private": true,
"scripts": {
"build": "rollup -c",
"dev": "rollup -c -w",
"start": "sirv public --no-clear",
"debug": "netlify dev"
},
"devDependencies": {
"@rollup/plugin-commonjs": "^17.0.0",
"@rollup/plugin-node-resolve": "^11.0.0",
"rollup": "^2.3.4",
"rollup-plugin-css-only": "^3.1.0",
"rollup-plugin-inject-process-env": "^1.3.1",
"rollup-plugin-livereload": "^2.0.0",
"rollup-plugin-replace": "^2.2.0",
"rollup-plugin-svelte": "^7.1.0",
"rollup-plugin-terser": "^7.0.0",
"svelte": "^3.49.0"
},
"dependencies": {
"faunadb": "^4.5.4",
"netlify-cli": "^10.10.2",
"netlify-lambda": "^2.0.15",
"process": "^0.11.10",
"sirv-cli": "^1.0.11"
}
}

rollup.config.js

import svelte from 'rollup-plugin-svelte';
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';
import css from 'rollup-plugin-css-only';
const production = !process.env.ROLLUP_WATCH;
function serve() {
let server;
function toExit() {
if (server) server.kill(0);
}
return {
writeBundle() {
if (server) return;
server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
stdio: ['ignore', 'inherit', 'inherit'],
shell: true
});
process.on('SIGTERM', toExit);
process.on('exit', toExit);
}
};
}
export default {
input: 'src/main.js',
output: {
sourcemap: true,
format: 'iife',
name: 'app',
file: 'public/build/bundle.js'
},
plugins: [
svelte({
compilerOptions: {
// enable run-time checks when not in production
dev: !production
}
}),
// we'll extract any component CSS out into
// a separate file - better for performance
css({ output: 'bundle.css' }),
// If you have external dependencies installed from
// npm, you'll most likely need these plugins. In
// some cases you'll need additional configuration -
// consult the documentation for details:
// https://github.com/rollup/plugins/tree/master/packages/commonjs
resolve({
browser: true,
dedupe: ['svelte']
}),
commonjs(),
// In dev mode, call `npm run start` once
// the bundle has been generated
!production && serve(),
// Watch the `public` directory and refresh the
// browser on changes when not in production
!production && livereload('public'),
// If we're building for production (npm run build
// instead of npm run dev), minify
production && terser()
],
watch: {
clearScreen: false
}
};

Answer 1

process是一个NodeJS变量，在浏览器中不可用。你有一个插件rollup-plugin-inject-process-env安装，但你没有使用它。首先用相应的变量设置它。