feat(ts-sdk): allow overriding CLI environment

[lopopolo-openai]

Summary

• add an env option for the TypeScript Codex client and plumb it into CodexExec so the CLI can run without inheriting process.env
• extend the test spy to capture spawn environments, add coverage for the new option, and document how to use it

Testing

• pnpm test (fails: corepack cannot download pnpm because outbound network access is blocked in the sandbox)

---

Codex Task

[lopopolo-openai]

> @openai/[email protected] test /home/runner/work/codex/codex/sdk/typescript
> jest

FAIL tests/runStreamed.test.ts
  ● Test suite failed to run

    src/exec.ts:110:11 - error TS2322: Type '{ [x: string]: string; } | { [key: string]: string | undefined; TZ?: string | undefined; }' is not assignable to type 'Record<string, string>'.
      Type '{ [key: string]: string | undefined; TZ?: string; }' is not assignable to type 'Record<string, string>'.
        'string' index signatures are incompatible.
          Type 'string | undefined' is not assignable to type 'string'.
            Type 'undefined' is not assignable to type 'string'.

    110     const env: Record<string, string> = {
                  ~~~

FAIL tests/abort.test.ts
  ● Test suite failed to run

    src/exec.ts:110:11 - error TS2322: Type '{ [x: string]: string; } | { [key: string]: string | undefined; TZ?: string | undefined; }' is not assignable to type 'Record<string, string>'.
      Type '{ [key: string]: string | undefined; TZ?: string; }' is not assignable to type 'Record<string, string>'.
        'string' index signatures are incompatible.
          Type 'string | undefined' is not assignable to type 'string'.
            Type 'undefined' is not assignable to type 'string'.

    110     const env: Record<string, string> = {
                  ~~~

FAIL tests/run.test.ts
  ● Test suite failed to run

    src/exec.ts:110:11 - error TS2322: Type '{ [x: string]: string; } | { [key: string]: string | undefined; TZ?: string | undefined; }' is not assignable to type 'Record<string, string>'.
      Type '{ [key: string]: string | undefined; TZ?: string; }' is not assignable to type 'Record<string, string>'.
        'string' index signatures are incompatible.
          Type 'string | undefined' is not assignable to type 'string'.
            Type 'undefined' is not assignable to type 'string'.

    110     const env: Record<string, string> = {

@codex fix this please

[chatgpt-codex-connector]

Summary

• Updated CodexExec so that it clones the provided environment override or filters undefined entries from process.env, ensuring the CLI receives a strict Record<string, string> and preventing the TypeScript build error. sdk/typescript/src/exec.tsL105-L133

Testing

• ⚠️ pnpm test (fails: corepack cannot download pnpm because outbound network access is blocked in the sandbox)

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