[bundle-rollup] Error: Could not resolve './undefined' in rollup

[t2ym]

[bundle-rollup] Error: Could not resolve './undefined' in rollup

Root Cause

• Fail to prepend a relative path marker "./" to the resolved relative ES module path to import

Reproducible Steps

• rollup an ES module that imports another ES module in the same directory as the importer module
• Error message in rollup

  Error: Could not resolve './undefined' from root/node_modules/react/esm/react-jsx-runtime.production.min.js

• react-jsx-runtime.production.min.js imports react.production.min.js in the same directory

Notes

• esm/* exports in react are generated and inexistent in the original package

Fix

• Just prepend './' by removing the incorrect parent object ast. from the inexistent ast.resolvedSource in this ast tree

  
  diff --git a/plugins/bundler-helpers/bundlerContextGeneratorFactory.js b/plugins/bundler-helpers/bundlerContextGeneratorFactory.js
  index 94b118a2..1b0ccb3d 100644
  --- a/plugins/bundler-helpers/bundlerContextGeneratorFactory.js
  +++ b/plugins/bundler-helpers/bundlerContextGeneratorFactory.js
  @@ -59,7 +59,7 @@ function bundlerContextGeneratorFactory(nodeLibs = {}, contextGeneratorHelper =
       else {
         resolvedSource = path.relative(path.dirname(astPath[0][0]), _module);
         if (!resolvedSource.startsWith('.')) {

• resolvedSource = './' + ast.resolvedSource;
• resolvedSource = './' + resolvedSource; } } ast.moduleDependencies[_module].resolvedSource = resolvedSource; // for rollup