fix: Change runtime builder to esbuild

esbuild/build.js

@@ -0,0 +1,63 @@
+#!/usr/bin/env node
+
+const {build} = require('esbuild');
+const {sassPlugin} = require('esbuild-sass-plugin');
+const autoprefixer = require('autoprefixer');
+const postcssPresetEnv = require('postcss-preset-env');
+const postcss = require('postcss');
+const tsconfigJson = require('../tsconfig.json');
+
+const {
+    compilerOptions: {target},
+} = tsconfigJson;
+
+const common = {
+    bundle: true,
+    sourcemap: true,
+    platform: 'browser',
+    target,
+    tsconfig: './tsconfig.json',
+};
+
+(async function buildCss() {
+    await build({
+        ...common,
+        entryPoints: ['src/scss/yfm.scss'],
+        outfile: 'dist/css/yfm.css',
+        format: 'iife',
+        plugins: [
+            sassPlugin({
+                async transform(source) {
+                    const {css} = await postcss([
+                        autoprefixer({cascade: false}),
+                        postcssPresetEnv({stage: 0}),
+                    ]).process(source, {from: undefined});
+
+                    return css;
+                },
+            }),
+        ],
+    });
+
+    await build({
+        ...common,
+        entryPoints: ['dist/css/yfm.css'],
+        outfile: 'dist/css/yfm.min.css',
+        minify: true,
+    });
+})();
+
+(async function buildJs() {
+    await build({
+        ...common,
+        entryPoints: ['src/js/index.ts'],
+        outfile: 'dist/js/yfm.js',
+    });
+
+    await build({
+        ...common,
+        entryPoints: ['dist/js/yfm.js'],
+        outfile: 'dist/js/yfm.min.js',
+        minify: true,
+    });
+})();