feat: decouple l-s entrypoint

tools/set-env-var.js

@@ -0,0 +1,24 @@
+const fs = require('fs')
+const os = require('os')
+const path = require('path')
+
+const setEnvVariable = (key, value) => {
+  const ENV_VARIABLES = fs.readFileSync(path.resolve(__dirname, '../.env'), 'utf-8').split(os.EOL)
+  const target = ENV_VARIABLES.indexOf(ENV_VARIABLES.find(line => line.match(new RegExp(`^${key}=`))))
+
+  if (target < 0) {
+    // The variable doesn't exist, add it
+    ENV_VARIABLES.push(`${key}=${value}`)
+  } else {
+    // .env already has that variable set, or at least has the definition of its key
+    //
+    // This is currently circumventing a possible bug on dotenv
+    // where the variables on this script were showing up as undefined on the first run despite the key existing,
+    // while on a second run they'd appear as empty string, as intended
+    ENV_VARIABLES.splice(target, 1, `${key}=${value}`)
+  }
+
+  fs.writeFileSync(path.resolve(__dirname, '../.env'), ENV_VARIABLES.join(os.EOL))
+}
+
+module.exports = setEnvVariable