CDK Construct - S3 Deployment stage missing `basePath`

[ghsyeung]

If basePath is set in next.config.js, the build would put static assets within ${sererlessBuildOutDir}/assets/${basePath}.

However, in the CDK construct (NextJSLambdaEdge), it tries to read the assets from ${sererlessBuildOutDir}/assets without including the basePath

serverless-next.js/packages/serverless-components/nextjs-cdk-construct/src/index.ts

Line 404 in 145c16d

const assets = readAssetsDirectory({ assetsDirectory });

The function returns with an empty assets object leading to none of the assets being uploaded.

Similar code in s3-static-assets handle this correctly

serverless-next.js/packages/libs/s3-static-assets/src/index.ts

Line 67 in 145c16d

path.join(assetsOutputDirectory, normalizedBasePath, "_next", "static")

The fix looks relatively straight forward and it works for my use case.

const { basePath } = this.routesManifest || {};
const normalizedBasePath = basePath && basePath.length > 0? basePath.slice(1) : "";
const assets = readAssetsDirectory({ assetsDirectory: path.join(assetsDirectory, normalizedBasePath) }); 

[dphang]

Thanks @ghsyeung. Feel free to raise a PR to fix it and I'll merge it.