npx & gist & npm package All In One

npx & gist & npm package All In One

npx & gist & npm package

# execute gist code `bin`

$ npx https://gist.github.com/xgqfrms/1981c08fcb7e09056e1c5d9192f272c8

npm

$ npm i -g rollup

$ npm i -S rollup

$ npm i -D rollup

https://www.npmjs.com/package/npm

npx

1. npx 先从本地已安装的 .node_modules 中加载对应的模块，找到了模块就直接使用，不需要再次安装模块；（npm ci）
2. 如果本地找不到模块，npx 会从远端 npm 下载依赖的模块到一个临时的目录，使用后会立即销毁该目录；
3. 可以手动指定仅使用本地的模块， 还是每次都从远程重新安装模块

$ npx rollup

# --no-install，让 npx 强制使用本地模块，不下载远程模块，可以使用--no-install参数；如果本地不存在该模块，就会报错；
$ npx --no-install rollup

# --ignore-existing,  忽略本地的同名模块，强制安装使用远程模块
$ npx --ignore-existing rollup

https://www.npmjs.com/package/npx
https://github.com/npm/npx

math.js

#!/usr/bin/env node

// math.js & `bin` package.json

console.log('math.js 👻');

const add = (a, b) => {
  return a + b;
}

 
const math = {
  add,
};

// test case
const result = add(1, 2);
console.log('result =', result, result === (1 + 2) ? '✅' : '❌');

// ESM
// export default math;
// Declaration or statement expected.ts(1128) ❌
// export math;

// CJS
// module.exports.add = add;
module.exports = math;

$ node ./math.js
# result = 3 ✅

1. npx error ❌

# gist is not an npm module, not exists the package.json file ❌
$ npx https://gist.github.com/xgqfrms/4a17f74c9c29866e2d0149e2f0feeb70

2. npx ok ✅

# gist is an npm module, and exists the package.json file ✅
$ npx https://gist.github.com/xgqfrms/1981c08fcb7e09056e1c5d9192f272c8


$ npx gist:1981c08fcb7e09056e1c5d9192f272c8

github gist & npm module

https://gist.github.com/gangsthub/0bce1161cfd2aa91ae7cad9abb42c342?permalink_comment_id=4159667#gistcomment-4159667

demos

PM2

# global
$ pm2 start server/index.js

# local
$ ./node_modules/pm2/bin/pm2 start server/index.js

# npx 等价于 ./node_modules/pm2/bin/ ✅
$ npx pm2 start server/index.js

nodemon

# global
$ nodemon ./server.js

# local
$ ./node_modules/nodemon/bin/nodemon.js ./server.js

# npx 等价于 ./node_modules/nodemon/bin/ ✅
$ npx nodemon server.js

refs

PM2 & nodemon & Node.js Deamon All In One

https://www.cnblogs.com/xgqfrms/p/13621076.html

https://www.npmjs.com/~xgqfrms

https://www.ruanyifeng.com/blog/2019/02/npx.html

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