/bin/sh: SET: command not found - reactjs

Question

I cloned a react project that contains the following package.json. After yarn, yarn start gave me the following error. I tried yarn add react-scripts start, but it still did not work.
I am using MacOS.
Could anyone help?
$ yarn start
yarn run v1.21.1
$ SET PORT=8000 && react-scripts start
/bin/sh: SET: command not found
error Command failed with exit code 127.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
package.json:
{
"name": "frontend",
"version": "0.1.0",
"private": true,
"dependencies": {
"#material-ui/core": "^4.9.8",
"#microsoft/office-js-helpers": "^1.0.2",
"#testing-library/jest-dom": "^4.2.4",
"#testing-library/react": "^9.3.2",
"#testing-library/user-event": "^7.1.2",
"#types/react-stripe-elements": "^6.0.4",
"#uifabric/react-cards": "^0.109.49",
"axios": "^0.19.2",
"color": "^3.1.2",
"cross-storage": "^1.0.0",
"dva": "^2.4.1",
"dva-model-creator": "^0.4.3",
"formik": "^2.1.4",
"lodash": "^4.17.15",
"moment": "^2.24.0",
"monaco-editor": "^0.20.0",
"node-sass": "^4.13.1",
"office-ui-fabric-react": "^7.105.4",
"query-string": "^6.11.1",
"react": "^16.13.1",
"react-app-polyfill": "^1.0.6",
"react-dom": "^16.13.1",
"react-monaco-editor": "^0.35.0",
"react-scripts": "3.4.1",
"react-stripe-elements": "^6.1.1",
"redux-devtools-extension": "^2.13.8",
"styled-components": "^5.0.1",
"typescript": "^3.8.3",
"yup": "^0.28.3"
},
"scripts": {
"start": "SET PORT=8000 && react-scripts start",
"build": "react-scripts --max_old_space_size=8096 build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"#types/color": "^3.0.1",
"#types/cross-storage": "^0.8.29",
"#types/jest": "^25.1.4",
"#types/lodash": "^4.14.149",
"#types/node": "^13.9.5",
"#types/query-string": "^6.3.0",
"#types/react": "^16.9.27",
"#types/react-dom": "^16.9.5",
"#types/react-redux": "^7.1.7",
"#types/styled-components": "^5.0.1",
"#types/yup": "^0.26.33"
}
}

Answer 1

On Posixes, the most compatible is "env PORT=8000 react-scripts start".
This is why the cross-env package exists; it does the right thing on both Windows and Posix systems.

Answer 2

On MacOS you don't need the SET. Change the content of the start script of the package.json to PORT=8000 react-scripts start.
Better yet, to support cross-OS environment variables setting you could use something like cross-env .
To do so, add the dependency to cross-env (yarn install --dev cross-env) and then rewrite the start script to cross-env PORT=8000 react-scripts start.

Answer 3

I think what you're looking for is this, to set the environment variable before executing the command: PORT=8000 react-scripts start, as Linux/Unix systems don't use the SET command to set environment variables like Windows does
If you're having issues with the react-scripts command not being found, directly reference the local version of the package using this command: PORT=8000 ./node_modules/.bin/react-scripts start