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Add comments to describe the purpose of each section of the code. #16003

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Add comments to describe the purpose of each section of the code. #16003

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9 changes: 9 additions & 0 deletions babel.config.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
"use strict";

// Check if the babel.config.js is being loaded during testing
if (
typeof it === "function" &&
// Jest loads the Babel config to parse file and update inline snapshots.
Expand All @@ -12,6 +13,7 @@ if (
const pathUtils = require("path");
const fs = require("fs");

// Helper function to normalize file paths
function normalize(src) {
return src.replace(/\//, pathUtils.sep);
}
Expand Down Expand Up @@ -75,6 +77,7 @@ module.exports = function (api) {
iterableIsArray: true,
};

// Define environment-specific configuration
let targets = {};
let convertESM = outputType === "script";
let replaceTSImportExtension = true;
Expand All @@ -101,6 +104,7 @@ module.exports = function (api) {
"./packages/babel-preset-env/src/available-plugins.js",
];

// Handle different environments
switch (env) {
// Configs used during bundling builds.
case "standalone":
Expand Down Expand Up @@ -324,6 +328,7 @@ module.exports = function (api) {
return config;
};

// Helper function to get monorepo packages
let monorepoPackages;
function getMonorepoPackages() {
if (!monorepoPackages) {
Expand All @@ -335,6 +340,8 @@ function getMonorepoPackages() {
return monorepoPackages;
}


// Helper function to determine import interop strategy for source files
function importInteropSrc(source, filename) {
if (
// These internal files are "real CJS" (whose default export is
Expand All @@ -359,6 +366,8 @@ function importInteropSrc(source, filename) {
return "node";
}


// Helper function to determine import interop strategy for test files
function importInteropTest(source) {
// This file will soon have an esm entrypoint
if (source === "@babel/helper-plugin-test-runner") {
Expand Down