Implement simple asset versioning task

A task to allow one to define zero or more JSON files and keys to create or update with the current timestamp.

By default, the boilerplate will maintain a './assets.json' file which should be imported by the Web framework and applied to compiled assets.

assets.json

@@ -0,0 +1,3 @@
+{
+    "version": 1664989419940
+}

build/build.js

@@ -1,9 +1,11 @@
 import concatFiles from './tasks/concats.js';
 import compileScripts from './tasks/scripts.js';
-import compileStyles from './tasks/styles.js' ;
-import compileSVGs from './tasks/svgs.js' ;
+import compileStyles from './tasks/styles.js';
+import compileSVGs from './tasks/svgs.js';
+import bumpVersion from './tasks/versions.js';
 
 concatFiles();
 compileScripts();
 compileStyles();
 compileSVGs();
+bumpVersion();

build/tasks/versions.js

@@ -0,0 +1,101 @@
+import loconfig from '../utils/config.js';
+import message from '../utils/message.js';
+import resolve from '../utils/template.js';
+import {
+    mkdir,
+    readFile,
+    writeFile,
+} from 'node:fs/promises';
+import {
+    basename,
+    dirname,
+} from 'node:path';
+
+/**
+ * @typedef  {object} VersionOptions
+ * @property {string} versionKey - The JSON field to add or update.
+ */
+
+/**
+ * @const {VersionOptions} defaultVersionOptions     - The default shared version options.
+ * @const {VersionOptions} developmentVersionOptions - The predefined version options for development.
+ * @const {VersionOptions} productionVersionOptions  - The predefined version options for production.
+ */
+export const defaultVersionOptions = {
+    versionKey: 'version',
+};
+export const developmentVersionOptions = Object.assign({}, defaultVersionOptions);
+export const productionVersionOptions  = Object.assign({}, defaultVersionOptions);
+
+/**
+ * @const {object} developmentVersionFilesArgs - The predefined `bumpVersion()` options for development.
+ * @const {object} productionVersionFilesArgs  - The predefined `bumpVersion()` options for production.
+ */
+export const developmentVersionFilesArgs = [
+    developmentVersionOptions,
+];
+export const productionVersionFilesArgs  = [
+    productionVersionOptions,
+];
+
+/**
+ * Bumps version numbers in file.
+ *
+ * @async
+ * @param  {object} [versionOptions=null] - Customize the version options.
+ *     If `null`, default production options are used.
+ * @return {Promise}
+ */
+export default async function bumpVersion(versionOptions = null) {
+    if (versionOptions == null) {
+        versionOptions = productionVersionOptions;
+    } else if (
+        versionOptions !== developmentVersionOptions &&
+        versionOptions !== productionVersionOptions
+    ) {
+        versionOptions = Object.assign({}, defaultVersionOptions, versionOptions);
+    }
+
+    loconfig.tasks.versions.forEach(async ({
+        outfile,
+        key = null,
+        label = null
+    }) => {
+        if (!label) {
+            label = basename(outfile || 'undefined');
+        }
+
+        const timeLabel = `${label} bumped in`;
+        console.time(timeLabel);
+
+        try {
+            outfile  = resolve(outfile);
+
+            let json
+
+            try {
+                json = JSON.parse(await readFile(outfile));
+            } catch (err) {
+                message(`${label} is a new file`, 'notice');
+
+                await mkdir(dirname(outfile), {recursive: true });
+
+                json = {};
+            }
+
+            json[key || versionOptions.versionKey] = (new Date()).valueOf();
+
+            await writeFile(outfile, JSON.stringify(json, null, 4))
+
+            message(`${label} bumped`, 'success', timeLabel);
+        } catch (err) {
+            message(`Error bumping ${label}`, 'error');
+            message(err);
+
+            notification({
+                title:   `${label} bumping failed 🚨`,
+                message: `${err.name}: ${err.message}`
+            });
+        }
+    });
+};

loconfig.json

@@ -62,6 +62,11 @@
                 "./www/**/*.html",
                 "./assets/scripts/**/*"
             ]
+        },
+        "versions": [
+            {
+                "outfile": "./assets.json"
             }
+        ]
     }
 }