Invalid regex (iso8601Pattern) when building with ajv ^8.8.2

Describe the bug When I run sls deploy I a regex error:

SyntaxError: Invalid regular expression: /^([\+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])((:?)[0-5]\d)?|24\:?00)([\.,]\d+(?!:))?)?(\17[0-5]\d([\.,]\d+)?)?([zZ]|([\+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/: Invalid escape
      at new RegExp (<anonymous>)
      at defaultRegExp (C:\dev\test-slic-watch\nexus\node_modules\ajv\lib\core.ts:66:53)
      

I think it’s this regex: https://github.com/fourTheorem/slic-watch/blob/main/serverless-plugin/config-schema.js#L6

To Reproduce sls deploy

Expected behavior

Environment:

• OS: Windows
• Node.js Version: 14.18.0
• NPM version: 6.14.15
• Serverless Framework Version: Framework Core: 2.69.1 (local) Plugin: 5.5.1 SDK: 4.3.0 Components: 3.18.1

Additional context We are using serverless-esbuild plugin which uses esbuild to build the code. https://github.com/floydspace/serverless-esbuild

[jakejscott]

Narrowed it down to this unicode flag that Ajv adds when creating the regex:

const iso8601Pattern = '^([\\+-]?\\d{4}(?!\\d{2}\\b))((-?)((0[1-9]|1[0-2])(\\3([12]\\d|0[1-9]|3[01]))?|W([0-4]\\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\\d|[12]\\d{2}|3([0-5]\\d|6[1-6])))([T\\s]((([01]\\d|2[0-3])((:?)[0-5]\\d)?|24\\:?00)([\\.,]\\d+(?!:))?)?(\\17[0-5]\\d([\\.,]\\d+)?)?([zZ]|([\\+-])([01]\\d|2[0-3]):?([0-5]\\d)?)?)?)?$';

const date = new Date().toISOString()
console.log('isValid', new RegExp(iso8601Pattern, 'u').test(date))

Error:

console.log('isValid', new RegExp(iso8601Pattern, 'u').test(date))
                       ^

SyntaxError: Invalid regular expression: /^([\+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])((:?)[0-5]\d)?|24\:?00)([\.,]\d+(?!:))?)?(\17[0-5]\d([\.,]\d+)?)?([zZ]|([\+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/: Invalid escape
    at new RegExp (<anonymous>)
    at Object.<anonymous> (/mnt/c/dev/jakejscott/slic-watch/serverless-test-project/test.js:11:24)
    ```

[jakejscott]

Hey @eoinsha I’ve managed to reproduce the issue 😃 Our project is using "ajv": "^8.8.2". If you upgrade the test project to that version and run npm run test (which calls sls package) it will throw that regex error.