Loads environment variables from a file relative to the current directory, making them available to applications on process.env. The environment variables which configure Node.js, such as NODE_OPTIONS, are parsed and applied. If the same variable is defined in the environment and in the file, the value from the environment takes precedence.
Before
{"name": "my-project","version": "1.0.0","dependencies": {"dotenv": "^16.4.3"},"scripts": {"start": "node -r dotenv/config index.js"}}
After
{"name": "my-project","version": "1.0.0","scripts": {"start": "node --env-file=.env index.js"}}
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