1 files changed, 50 insertions, 0 deletions

diff --git a/config/esbuild-config.js b/config/esbuild-config.js
new file mode 100644
index 0000000..9140b89
--- /dev/null
+++ b/config/esbuild-config.js
@@ -0,0 +1,50 @@
+// @ts-check
+
+const { banner } = require('./build-common');
+
+/** @type {string} */
+const mode = process.env.MODE || 'development';
+
+/** @type {boolean} */
+const isDevelopment = mode === 'development';
+
+const modeString = JSON.stringify(mode);
+
+const defineEnv = {
+  'import.meta.env.DEV': JSON.stringify(isDevelopment),
+  'import.meta.env.MODE': modeString,
+  'import.meta.env.PROD': JSON.stringify(!isDevelopment),
+  'process.env.NODE_ENV': modeString,
+  'process.env.MODE': modeString,
+};
+
+/**
+ * @param {import('esbuild').BuildOptions} config
+ * @param {object | unknown} metaEnvVars
+ * @returns {import('esbuild').BuildOptions}
+ */
+module.exports.getConfig = function(config, metaEnvVars) {
+  const defineMeta = {};
+  for (const varName in metaEnvVars) {
+    defineMeta[`import.meta.env.${varName}`] = JSON.stringify(metaEnvVars[varName]);
+  }
+  return {
+    logLevel: 'info',
+    bundle: true,
+    treeShaking: !isDevelopment,
+    minify: !isDevelopment,
+    banner: {
+      js: banner,
+    },
+    ...config,
+    sourcemap: isDevelopment ? (config.sourcemap || true) : false,
+    define: {
+      ...defineEnv,
+      ...defineMeta,
+      ...config.define,
+    },
+    plugins: [
+      ...(config.plugins || []),
+    ],
+  };
+}