package.json reference value from external json

Question

I have a metadata.json file which includes some values:

{"build":{"major":0,"minor":88}}

In my create-react-app project, I need to run the script to upload sentry map files:

"sentry" : "sentry-cli releases files 0.88 upload-sourcemaps --validate ./build"

where the 0.88 should be pulled from the metadata.json file. I can then run it with:

npm run sentry

How can I pull the value 0.88 from the metadata.json file with build major/ minor and insert it into the sentry command?

Answer 1

I am not sure if there is a solution to do this via package.json.

Below are the steps I would have taken to solve this problem:

1. Create a new js file. Let's say the name is run-command.js.
2. Add a line node ./run-command.js under the script object in package.json.
3. Import the metadata.json file in this newly created file and extract the necessary data
4. Execute your command

Example:

package.json

scripts: {
  "sentry": "node ./run-command.js"
}

run-command.js

const metadata = require('./metadata.json');
const { exec } = require('child_process');

exec(`echo ${metadata.build.major}`, (err, stdout, stderr) => {
  if (err) {
    // node couldn't execute the command
    return;
  }

  // the *entire* stdout and stderr (buffered)
  console.log(`stdout: ${stdout}`);
  console.log(`stderr: ${stderr}`);
});

Replace echo with your command. It would look something like ./node_modules/.bin/sentry ...

You can use a bash script like ./sentry.sh if you are comfortable with shell scripts.