f.ClientHandshake is not a constructor

Hi,

When I use the package locally, everything works fine. However, when I use it inside an AWS Lambda function to connect to an RDS instance, I get this cryptic error:

TypeError: f.ClientHandshake is not a constructor
at new g (/var/task/index.js:275:62824)
at new o (/var/task/index.js:275:224046)
at e.exports.getConnection (/var/task/index.js:275:218705)
at e.exports.execute (/var/task/index.js:275:220197)
at /var/task/index.js:275:372341
at new Promise (<anonymous>)
at c.execute (/var/task/index.js:275:372308)
at /var/task/index.js:357:14189
at E (/var/task/index.js:316:24416)
at Generator._invoke (/var/task/index.js:316:24204)

Any idea what the issue is? I’m confident that the roles/security groups are all configured correctly.

Thanks

[astrobob]

Hi @sidorares Unfortunately, I lost a day facing the same issue, but not with AWS. Thanks to https://stackoverflow.com/questions/53524510/mysql2-typeerror-f-clienthandshake-is-not-a-constructor, I finally understood the problem was coming with Webpack as I use typescript.

However, why is this ticket closed? There is still an issue, because as soon as you minify the code for production, your module doesn’t work any more.

Please consider this issue (it might maybe only concern users using Typescript, but still, it’s an issue)

Thank you in advance

[BarthesSimpson]

Yes, I’m using Webpack to bundle it. I did just notice I get a warning during the packaging stage that may be related

WARNING in ./node_modules/mysql2/lib/helpers.js
Module not found: Error: Can't resolve 'cardinal' in '<...>/node_modules/mysql2/lib'
 @ ./node_modules/mysql2/lib/helpers.js
 @ ./node_modules/mysql2/lib/parsers/binary_parser.js
 @ ./node_modules/mysql2/lib/commands/execute.js
 @ ./node_modules/mysql2/lib/commands sync ^\.\/.*\.js$
 @ ./node_modules/mysql2/lib/commands/index.js
 @ ./node_modules/mysql2/lib/connection.js
 @ ./node_modules/mysql2/index.js
 @ ./node_modules/mysql2/promise.js
 @ ./src/db/index.js
 @ ./src/db/models/<...>.js
 @ ./src/<...>.js
 @ ./src/<...>/index.js
 @ multi ./src/<...>/index.js