Move globals to static ViewEngine and add setGlobal()

src/frontend/SvelteViewEngine.ts

@@ -72,9 +72,6 @@ export default class SvelteViewEngine extends ViewEngine {
             css,
         ] = view.split(SvelteViewEngine.getPreCompileSeparator(canonicalViewName));
 
-        // Props (locals)
-        locals = Object.assign(this.getGlobals(), locals);
-
         const localMap: Record<string, unknown> = {};
         backendLines.split('\n').forEach(line => {
             const key = line.substring(1, line.indexOf(',') >= 0 ? line.indexOf(',') - 1 : line.length - 1);
@@ -140,16 +137,6 @@ export default class SvelteViewEngine extends ViewEngine {
         await this.stopRollup();
     }
 
-    /**
-     * TODO: add a way to add globals from anywhere
-     */
-    private getGlobals(): Record<string, unknown> {
-        return {
-            route: (name: string) => 'unimplemented route ' + name,
-            direct: 'access',
-        };
-    }
-
     public async preCompile(canonicalName: string, alsoCompileDependents: boolean): Promise<void> {
         const file = await this.resolveFileFromCanonicalName(canonicalName);
         const intermediateFile = path.join(this.getBuildDir(), canonicalName);
@@ -345,15 +332,15 @@ export default class SvelteViewEngine extends ViewEngine {
             cssOutputFilename: file + '.css',
         });
 
-        const locals = this.getGlobals();
+        const globals = ViewEngine.getGlobals();
         delete require.cache[path.resolve(file)];
         return requireFromString(svelteSsr.js.code, file).default.render({
             swaf: (key: string, args?: unknown[]) => {
-                if (!args) return locals[key];
+                if (!args) return globals[key];
 
-                const f = locals[key];
+                const f = globals[key];
                 if (typeof f !== 'function') throw new Error(key + ' is not a function.');
-                return f.call(locals, ...args);
+                return f.call(globals, ...args);
             },
         });
     }

src/frontend/ViewEngine.ts

@@ -3,8 +3,20 @@ import fs from "fs";
 import chokidar, {FSWatcher} from "chokidar";
 import {logger} from "../Logger";
 import {afs, readdirRecursively} from "../Utils";
+import {Express} from "express";
 
 export default abstract class ViewEngine {
+    private static readonly globals: Record<string, unknown> = {};
+
+    public static getGlobals(): Record<string, unknown> {
+        return this.globals;
+    }
+
+    public static setGlobal(key: string, value: unknown): void {
+        this.globals[key] = value;
+    }
+
+
     protected readonly viewPaths: string[];
     private watcher?: FSWatcher;
 
@@ -42,6 +54,16 @@ export default abstract class ViewEngine {
         callback: (err: Error | null, output?: string) => void,
     ): Promise<void>;
 
+    public setup(app: Express): void {
+        app.engine(this.getExtension(), (path, options, callback) => {
+            // Props (locals)
+            const locals = Object.assign(ViewEngine.getGlobals(), options);
+
+            this.render(path, locals, callback)
+                .catch(err => callback(err));
+        });
+    }
+
     public getViewPaths(): string[] {
         return this.viewPaths;
     }