[Feature request] Write to dotenv file

[aswamy]

Currently, the dotenv library exposes the following methods:

• config
• parse
• populate
• decrypt

I'd love to be able to write to the .env file, or patch it with existing variables.

Example:

const envVars = {
  API-KEY: "555",
  SECRET: 123
}

dotenv.write(envVars, file); // Writes the provided object into the .env file

const envVarsPatch = {
  API-KEY: "444",
}

dotenv.patch(envVarsPatch, file); // If the environment variables provided in the object exist in the file, update it; or else insert it

Some edge case considerations:

• If the value contains a new-line, enclose the variable value in double quotes
• If the string contains double quotes, use single quotes; if the string contains single & double quotes, use tilde
• dotenv.patch should be able to ignore comments and bad characters in the file

[motdotla]

this is outside of the scope of this library, but it will be added to dotenvx - which adds a lot of improved tooling and safety around .env files.

likely it will be dotenvx set KEY=value