2 files changed, 65 insertions, 0 deletions
diff --git a/node_modules/@babel/helpers/scripts/generate-helpers.js b/node_modules/@babel/helpers/scripts/generate-helpers.js
new file mode 100644
index 0000000..1c59746
--- /dev/null
+++ b/node_modules/@babel/helpers/scripts/generate-helpers.js
@@ -0,0 +1,64 @@
+import fs from "fs";
+import { join } from "path";
+import { URL, fileURLToPath } from "url";
+import { minify } from "terser"; // eslint-disable-line
+
+const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
+const IGNORED_FILES = new Set(["package.json"]);
+
+export default async function generateHelpers() {
+  let output = `/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'yarn gulp generate-runtime-helpers'
+ */
+
+import template from "@babel/template";
+
+function helper(minVersion, source) {
+  return Object.freeze({
+    minVersion,
+    ast: () => template.program.ast(source),
+  })
+}
+
+export default Object.freeze({
+`;
+
+  for (const file of (await fs.promises.readdir(HELPERS_FOLDER)).sort()) {
+    if (IGNORED_FILES.has(file)) continue;
+    if (file.startsWith(".")) continue; // ignore e.g. vim swap files
+
+    const [helperName] = file.split(".");
+
+    const filePath = join(fileURLToPath(HELPERS_FOLDER), file);
+    if (!file.endsWith(".js")) {
+      console.error("ignoring", filePath);
+      continue;
+    }
+
+    const fileContents = await fs.promises.readFile(filePath, "utf8");
+    const minVersionMatch = fileContents.match(
+      /^\s*\/\*\s*@minVersion\s+(?<minVersion>\S+)\s*\*\/\s*$/m
+    );
+    if (!minVersionMatch) {
+      throw new Error(`@minVersion number missing in ${filePath}`);
+    }
+    const { minVersion } = minVersionMatch.groups;
+
+    const source = await minify(fileContents, {
+      mangle: false,
+      // The _typeof helper has a custom directive that we must keep
+      compress: { directives: false },
+    });
+
+    output += `\
+  ${JSON.stringify(helperName)}: helper(
+    ${JSON.stringify(minVersion)},
+    ${JSON.stringify(source.code)},
+  ),
+`;
+  }
+
+  output += "});";
+  return output;
+}
diff --git a/node_modules/@babel/helpers/scripts/package.json b/node_modules/@babel/helpers/scripts/package.json
new file mode 100644
index 0000000..5ffd980
--- /dev/null
+++ b/node_modules/@babel/helpers/scripts/package.json
@@ -0,0 +1 @@
+{ "type": "module" }