Initial pass

node_modules/jest-pnp-resolver/index.js

@@ -0,0 +1,41 @@
+
+let pnp;
+
+try {
+  pnp = require(`pnpapi`);
+} catch (error) {
+  // not in PnP; not a problem
+}
+
+let defaultResolver;
+
+function requireDefaultResolver() {
+  if (!defaultResolver) {
+    try {
+      defaultResolver = require(`jest-resolve/build/defaultResolver`).default;
+    } catch (error) {
+      defaultResolver = require(`jest-resolve/build/default_resolver`).default;
+    }
+  }
+
+  return defaultResolver;
+}
+
+module.exports = (request, options) => {
+  const {basedir, defaultResolver, extensions} = options;
+
+  if (pnp) {
+    const resolution = pnp.resolveRequest(request, `${basedir}/`, {extensions});
+
+    // When the request is a native module, Jest expects to get the string back unmodified, but pnp returns null instead.
+    if (resolution === null)
+      return request;
+
+    return resolution;
+  } else {
+    if (!defaultResolver)
+      defaultResolver = requireDefaultResolver();
+
+    return defaultResolver(request, options);
+  }
+};