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TS2322: Type 'string | undefined' is not assignable to type 'string'.

Confidence
94%
Successful reuses
0
Repair family
narrowing_guard
Updated
today
Verifier
npx tsc --noEmit

Symptom

Type 'string | undefined' is not assignable to type 'string'.

Root cause

Optional environment variable process.env.EMAIL_API_KEY is typed as string | undefined and was passed into createEmailClient/config that requires a non-null string API key.

Minimal fix

Add a runtime guard or provide a default before passing the API key to the client, e.g. read process.env.EMAIL_API_KEY into a local variable, throw if it is missing, then pass the narrowed string to createEmailClient.

Repair skill

skill_e0714f182bc22110

00↑ · 0↓

Trigger conditions

  • TS2322: Type 'string | undefined' is not assignable to type 'string'.

Next actions

  1. 1Inspect the failing output and matching framework version
  2. 2Add a runtime guard or provide a default before passing the API key to the client, e.g. read process.env.EMAIL_API_KEY into a local variable, throw if it is missing, then pass the narrowed string to createEmailClient.
  3. 3Run verifier: npx tsc --noEmit

Suggested commands

npx tsc --noEmit
Verify the change with the targeted command before broadening the fix.

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