Function getEnvFileVars

src/parse-env-file.ts:11–52

(envFilePath: string)

 * Gets the environment vars from an env file
 */
export async function getEnvFileVars(envFilePath: string): Promise<Environment> {
  const absolutePath = resolveEnvFilePath(envFilePath)
  if (!existsSync(absolutePath)) {
    const pathError = new Error(`Invalid env file path (${envFilePath}).`)
    pathError.name = 'PathError'
    throw pathError
  }

  // Get the file extension
  const ext = extname(absolutePath).toLowerCase()
  let env: unknown;
  if (IMPORT_HOOK_EXTENSIONS.includes(ext)) {
    if (/tsx?$/.test(ext)) checkIfTypescriptSupported();

    // For some reason in ES Modules, only JSON file types need to be specifically delinated when importing them
    let attributeTypes = {}
    if (ext === '.json') {
      attributeTypes = { with: { type: 'json' } }
    }
    const res: unknown = await import(pathToFileURL(absolutePath).href, attributeTypes)
    if (typeof res === 'object' && res && 'default' in res) {
      env = res.default
    } else {
      env = res
    }
    // Check to see if the imported value is a promise
    if (isPromise(env)) {
      env = await env
    }

    return normalizeEnvObject(env, absolutePath)
  }

  const file = readFileSync(absolutePath, { encoding: 'utf8' })

  switch (ext) {
    // other loaders can be added here

    default:
      return parseEnvString(file)
  }
}

/**
 * Parse out all env vars from a given env file string and return an object