npm script is unable to find file in workdir in a docker container

Question

This is my Dockerfile:

FROM node:12
WORKDIR /app
COPY . /app
RUN npm install
EXPOSE 3000
CMD ["npm", "start"]

This is the npm script in my package.json

"start": "main.js $npm_config_e $npm_config_t"

when I run the docker image I get this error

sh: 1: main.js: not found
npm ERR! code ELIFECYCLE
npm ERR! syscall spawn
npm ERR! file sh
npm ERR! errno ENOENT
npm ERR! image1@1.0.0 start: `main.js`

However when I do an 'ls' the main.js is in the working directory (/app) also if I change the Dockerfile to:

CMD ["node", "main.js"]

it works. So why does the npm script not find the main.js file?

Answer 1

现在看起来很明显，但解决方案是将节点添加到 npm 脚本中：

"start": "node main.js $npm_config_e $npm_config_t"