move shim to new package

packages/shim/build.js

@@ -0,0 +1,20 @@
+const esbuild = require("esbuild");
+const path = require("path");
+
+const { version: ignisVersion } = require("../../package.json");
+
+module.exports = esbuild.build({
+  entryPoints: [path.join(__dirname, "src", "loader.js")],
+  bundle: true,
+  outfile: path.join(__dirname, "dist", "shim-loader.js"),
+  format: "iife",
+  platform: "browser",
+  target: ["chrome90"],
+  alias: {
+    path: "path-browserify",
+  },
+  define: {
+    __IGNIS_VERSION__: JSON.stringify(ignisVersion),
+  },
+  logLevel: "info",
+});