Public commit

scripts/plugins/babel-filename.ts

@@ -0,0 +1,30 @@
+import { basename, dirname } from "path"
+import type { BabelPlugin } from "./esbuild-babel"
+
+export const fileName =
+  ({
+    hasFileName,
+    hasDirName,
+    path,
+  }: {
+    hasFileName: boolean
+    hasDirName: boolean
+    path: string
+  }): BabelPlugin =>
+  ({ types: t }) => ({
+    name: "__filename polyfill",
+    visitor: {
+      Program(program) {
+        const assign = (id: string, value: string) =>
+          t.variableDeclaration("var", [
+            t.variableDeclarator(t.identifier(id), t.stringLiteral(value)),
+          ])
+        if (hasFileName) {
+          program.node.body.unshift(assign("__filename", basename(path)))
+        }
+        if (hasDirName) {
+          program.node.body.unshift(assign("__dirname", dirname(path)))
+        }
+      },
+    },
+  })