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You can tune the serialization with <https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/pulumi/runtime/closure/#CodePathOptions>

The serialization attempts to compute what packages are needed (see <https://github.com/pulumi/pulumi/blob/master/sdk/nodejs/runtime/closure/codePaths.ts#L85>) so it shouldn’t normally include everything in `node_modules`

The docstring a few lines above what I linked provides some context