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The code looks something like:

```    const certificate = new aws.acm.Certificate(domain, {
      domainName: domain,
      subjectAlternativeNames: alternateNames,
      validationMethod: "DNS"
    }),
      domainNames: Output&lt;aws.route53.Record[]&gt; = certificate.domainValidationOptions.apply((opts) =&gt; 
        opts.map((opt) =&gt; new aws.route53.Record(domain, {
          records: [opt.resourceRecordValue],
          ttl: 60,
          type: opt.resourceRecordType,
          zoneId: zone.id,
      })))


    return new aws.acm.CertificateValidation(domain, {
      certificateArn: certificate.arn,
      validationRecordFqdns: domainNames.apply((domains) =&gt; domains.map((domain) =&gt; domain.fqdn)),
    }, { dependsOn: domainNames })```
(`domain` and `zone` are provided as arguments)

Error isn't real helpful (`pulumi up`, happens during preview):

```TypeError: Cannot read property 'concat' of undefined
        at C:\Users\Justin\Source\asheworks\deploy\node_modules\@pulumi\pulumi\runtime\resource.js:355:29
        at Generator.next (&lt;anonymous&gt;)
        at fulfilled (C:\Users\Justin\Source\asheworks\deploy\node_modules\@pulumi\pulumi\runtime\resource.js:18:58)```

It looks like you have a Syntax Error right before domainNames

It compiles and runs, that's an artifact of copying/pasting this out of a larger program