web/NPM Workspaces: ESbuild version cleanup (#14541)

* web: Check JS files. Add types.

* web: Fix issues surrounding Vite/ESBuild types.

* web: Clean up version constants. Tidy types

* web: Clean up docs, types.

* web: Clean up package paths.

* web: (ESLint) no-lonely-if

* web: Render slot before navbar.

* web: Fix line-height alignment.

* web: Truncate long headers.

* web: Clean up page header declarations. Add story. Update paths.

* web: Ignore out directory.

* web: Lint Lit.

* web: Use private alias.

* web: Fix implicit CJS mode.

* web: Update deps.

* web: await all imports.

web/packages/core/environment/node.js

@@ -0,0 +1,66 @@
+/**
+ * @file Utility functions for working with environment variables.
+ */
+/// <reference types="../types/node.js" />
+
+//#region Constants
+
+/**
+ * The current Node.js environment, defaulting to "development" when not set.
+ *
+ * Note, this should only be used during the build process.
+ *
+ * If you need to check the environment at runtime, use `process.env.NODE_ENV` to
+ * ensure that module tree-shaking works correctly.
+ *
+ * @category Environment
+ * @runtime node
+ */
+export const NodeEnvironment = process.env.NODE_ENV || "development";
+
+/**
+ * A source environment variable, which can be a string, number, boolean, null, or undefined.
+ * @typedef {string | number | boolean | null | undefined} EnvironmentVariable
+ */
+
+/**
+ * A type helper for serializing environment variables.
+ *
+ * @category Environment
+ * @template {EnvironmentVariable} T
+ * @typedef {T extends string ? `"${T}"` : T} JSONify
+ */
+
+//#endregion
+
+//#region Utilities
+
+/**
+ * Given an object of environment variables, serializes them into a mapping of
+ * environment variable names to their respective runtime constants.
+ *
+ * This is useful for defining environment variables while bundling with ESBuild, Vite, etc.
+ *
+ * @category Environment
+ * @runtime node
+ *
+ * @template {Record<string, EnvironmentVariable>} EnvRecord
+ * @template {string} [Prefix='import.meta.env.']
+ *
+ * @param {EnvRecord} input
+ * @param {Prefix} [prefix='import.meta.env.']
+ *
+ * @returns {{[K in keyof EnvRecord as `${Prefix}${K}`]: JSONify<EnvRecord[K]>}}
+ */
+export function serializeEnvironmentVars(
+    input,
+    prefix = /** @type {Prefix} */ ("import.meta.env."),
+) {
+    const env = Object.fromEntries(
+        Object.entries(input).map(([key, value]) => [prefix + key, JSON.stringify(value ?? "")]),
+    );
+
+    return /** @type {any} */ (env);
+}
+
+//#endregion