Switch to using rollup instead of custom transformer

gulpfile.js

@@ -3,11 +3,9 @@ const fs = require('fs-extra');
 const path = require('path');
 const chalk = require('chalk');
 const stringify = require('json-stringify-pretty-compact');
-const typescript = require('typescript');
-
-const ts = require('gulp-typescript');
-
 const argv = require('yargs').argv;
+const { rollup } = require('rollup');
+const rollupConfig = require('./rollup.config');
 
 function getManifest() {
     const json = {};
@@ -30,70 +28,6 @@ function getManifest() {
     return json;
 }
 
-/**
- * TypeScript transformers
- * @returns {typescript.TransformerFactory<typescript.SourceFile>}
- */
-function createTransformer() {
-    /**
-     * @param {typescript.Node} node
-     */
-    function shouldMutateModuleSpecifier(node) {
-        if (!typescript.isImportDeclaration(node) && !typescript.isExportDeclaration(node)) return false;
-        if (node.moduleSpecifier === undefined) return false;
-        if (!typescript.isStringLiteral(node.moduleSpecifier)) return false;
-        if (!node.moduleSpecifier.text.startsWith('./') && !node.moduleSpecifier.text.startsWith('../')) return false;
-        if (path.extname(node.moduleSpecifier.text) !== '') return false;
-        return true;
-    }
-
-    /**
-     * Transforms import/export declarations to append `.js` extension
-     * @param {typescript.TransformationContext} context
-     */
-    function importTransformer(context) {
-        return (node) => {
-            /**
-             * @param {typescript.Node} node
-             */
-            function visitor(node) {
-                if (shouldMutateModuleSpecifier(node)) {
-                    if (typescript.isImportDeclaration(node)) {
-                        const newModuleSpecifier = typescript.createLiteral(`${node.moduleSpecifier.text}.js`);
-                        return typescript.updateImportDeclaration(
-                            node,
-                            node.decorators,
-                            node.modifiers,
-                            node.importClause,
-                            newModuleSpecifier,
-                        );
-                    } else if (typescript.isExportDeclaration(node)) {
-                        const newModuleSpecifier = typescript.createLiteral(`${node.moduleSpecifier.text}.js`);
-                        return typescript.updateExportDeclaration(
-                            node,
-                            node.decorators,
-                            node.modifiers,
-                            node.exportClause,
-                            newModuleSpecifier,
-                        );
-                    }
-                }
-                return typescript.visitEachChild(node, visitor, context);
-            }
-
-            return typescript.visitNode(node, visitor);
-        };
-    }
-
-    return importTransformer;
-}
-
-const tsConfig = ts.createProject('tsconfig.json', {
-    getCustomTransformers: (_program) => ({
-        after: [createTransformer()],
-    }),
-});
-
 /********************/
 /*		BUILD		*/
 /********************/
@@ -101,15 +35,16 @@ const tsConfig = ts.createProject('tsconfig.json', {
 /**
  * Build TypeScript
  */
-function buildTS() {
+async function buildTS() {
-    return gulp.src('src/**/*.ts').pipe(tsConfig()).pipe(gulp.dest('dist'));
+    const build = await rollup({ input: rollupConfig.input, plugins: rollupConfig.plugins });
+    return build.write(rollupConfig.output);
 }
 
 /**
  * Copy static files
  */
 async function copyFiles() {
-    const statics = ['lang', 'module.json'];
+    const statics = ['module.json'];
     try {
         for (const file of statics) {
             if (fs.existsSync(path.join('src', file))) {
@@ -127,11 +62,7 @@ async function copyFiles() {
  */
 function buildWatch() {
     gulp.watch('src/**/*.ts', { ignoreInitial: false }, buildTS);
-    gulp.watch(
+    gulp.watch(['src/*.json'], { ignoreInitial: false }, copyFiles);
-        ['src/fonts', 'src/lang', 'src/templates', 'src/*.json', 'src/packs'],
-        { ignoreInitial: false },
-        copyFiles,
-    );
 }
 
 /********************/
@@ -148,7 +79,7 @@ async function clean() {
 
     // If the project uses TypeScript
     if (fs.existsSync(path.join('src', 'module', `${name}.ts`))) {
-        files.push('lang', 'module', `${name}.js`, 'module.json');
+        files.push('module', `${name}.js`, 'module.json');
     }
 
     console.log(' ', chalk.yellow('Files to clean:'));

package.json

@@ -27,13 +27,13 @@
         "updateManifest": "gulp updateManifest",
         "lint": "eslint 'src/**/*.ts' --cache",
         "lint:fix": "eslint 'src/**/*.ts' --cache --fix",
-        "format": "prettier --write 'src/**/*.(ts|json|scss)'"
+        "format": "prettier --write 'src/**/*.(ts|json)'"
     },
     "devDependencies": {
+        "@rollup/plugin-typescript": "^8.1.1",
         "@types/fs-extra": "^9.0.6",
         "@typescript-eslint/eslint-plugin": "^4.14.2",
         "@typescript-eslint/parser": "^4.14.2",
-        "archiver": "^5.2.0",
         "chalk": "^4.1.0",
         "eslint": "^7.19.0",
         "eslint-config-prettier": "^7.2.0",
@@ -41,15 +41,12 @@
         "foundry-vtt-types": "github:League-of-Foundry-Developers/foundry-vtt-types#foundry-0.7.9",
         "fs-extra": "^9.1.0",
         "gulp": "^4.0.2",
-        "gulp-git": "^2.10.1",
-        "gulp-less": "^4.0.1",
-        "gulp-sass": "^4.1.0",
-        "gulp-typescript": "^6.0.0-alpha.1",
         "husky": "^4.3.8",
         "json-stringify-pretty-compact": "^2.0.0",
         "lint-staged": "^10.5.4",
         "prettier": "^2.2.1",
-        "ts-node": "^9.1.1",
+        "rollup": "^2.38.5",
+        "tslib": "^2.1.0",
         "typescript": "^4.1.3",
         "yargs": "^16.2.0"
     },

rollup.config.js

@@ -0,0 +1,10 @@
+const typescript = require('@rollup/plugin-typescript');
+
+module.exports = {
+    input: 'src/module/risk-dice-modifier.ts',
+    output: {
+        dir: 'dist/module',
+        format: 'es',
+    },
+    plugins: [typescript()],
+};

src/module.json

@@ -6,9 +6,7 @@
     "version": "0.1.0",
     "minimumCoreVersion": "0.7.9",
     "compatibleCoreVersion": "0.7.9",
-    "esmodules": [
+    "esmodules": ["module/risk-dice-modifier.js"],
-        "module/risk-dice-modifier.js"
-    ],
     "url": "https://git.f3l.de/ghost/risk-dice-modifier",
     "manifest": "https://git.f3l.de/ghost/risk-dice-modifier/-/raw/latest/src/module.json?inline=false",
     "download": "https://git.f3l.de/ghost/risk-dice-modifier/-/jobs/artifacts/0.1.0/download?job=build",