When I upgraded from 1.33.0 -> 1.37.0, I started getting the error below. I reverted back to the old CDK version, and the command works again.
CDK version
$ cdk --version
1.37.0 (build e4709de)
Error:
$ cdk synth
Unexpected token '?'
Subprocess exited with error 1
Any insight as to what this error message could mean?
Another cause for this issue could be an outdated node version, CDK support for node 12 has been dropped in this release.
Upgrading to a supported node version resolves the issue.
The issue was in the typescript compiler. I had the target set to ES2020 when it should've been ES2018.
Changing to the correct version fixed the issue for me.
tsconfig.json
{
"compilerOptions": {
"target":"ES2018",
"module": "commonjs",
"lib": ["es2018"],
"declaration": true,
"strict": true,
...
}
}