Added manifest building.

webpack/webpack.manifest.js

@@ -0,0 +1,65 @@
+const webpack = require("webpack");
+const path = require('path');
+const CopyPlugin = require('copy-webpack-plugin');
+const validateOptions = require('schema-utils');
+
+const fs = require('fs');
+
+const manifest = require("../manifest/manifest.json");
+const firefoxManifestExtra = require("../manifest/firefox-manifest-extra.json");
+const chromeManifestExtra = require("../manifest/chrome-manifest-extra.json");
+
+// schema for options object
+const schema = {
+    type: 'object',
+    properties: {
+        browser: {
+            type: 'string'
+        },
+        pretty: {
+            type: 'boolean'
+        }
+    }  
+};
+
+class BuildManifest {
+    constructor (options = {}) {
+        validateOptions(schema, options, "Build Manifest Plugin");
+
+        this.options = options;
+    }
+
+    apply(compiler) {
+        const distManifestFile = path.resolve(__dirname, "../dist/manifest.json");
+
+        // Add missing manifest elements
+        if (this.options.browser.toLowerCase() === "firefox") {
+            mergeObjects(manifest, firefoxManifestExtra);
+        } else if (this.options.browser.toLowerCase() === "chrome" || this.options.browser.toLowerCase() === "chromium") {
+            mergeObjects(manifest, chromeManifestExtra);
+        }
+
+        let result = JSON.stringify(manifest);
+        if (this.options.pretty) result = JSON.stringify(manifest, null, 2);
+
+        fs.writeFileSync(distManifestFile, result);
+    }
+}
+
+function mergeObjects(object1, object2) {
+    for (const key in object2) {
+        if (key in object1) {
+            if (Array.isArray(object1[key])) {
+                object1[key] = object1[key].concat(object2[key]);
+            } else if (typeof object1[key] == 'object') {
+                mergeObjects(object1[key], object2[key]);
+            } else {
+                object1[key] = object2[key];
+            }
+        } else {
+            object1[key] = object2[key];
+        }
+    }
+}
+
+module.exports = BuildManifest;