Omit a blank environment binding

[ayaangazali]

Defect

A LOGFIRE_ENVIRONMENT binding declared without a value reaches the resource as deployment.environment.name: "", so every span from the Worker carries an empty environment rather than none. Declaring a binding with no value is ordinary in a wrangler.toml or a CI-provided secret that has not been set yet.

Evidence

envString returns the raw string, and the config guard only rejects undefined:

const envDeploymentEnvironment = envString(env, 'LOGFIRE_ENVIRONMENT')
const resolvedEnvironment = config.environment ?? envDeploymentEnvironment
...
...(resolvedEnvironment !== undefined ? { environment: resolvedEnvironment } : {}),

The Python SDK guards the same field on truthiness, so a blank value leaves the attribute off (_internal/config.py):

if self.environment:
    dedicated_attributes[RESOURCE_ATTRIBUTES_DEPLOYMENT_ENVIRONMENT_NAME] = self.environment

Reproduced on eb3a272 through the existing config-capture harness in index.test.ts: resolving with LOGFIRE_ENVIRONMENT: '' produced a config carrying environment: ''.

Fix

Reject the empty string alongside undefined at that guard. Doing it there rather than inside envString also covers instrumentInProcess(handler, { environment: '' }), which reaches the same line.

The test asserts both directions, so it fails if a blank starts being recorded again or if a real environment stops being passed through.

Scoped to this package on purpose. otel-cf-workers has the same !== undefined guard when it builds the resource, which matters if that package is used directly rather than through this wrapper, but its createResource is module-private behind a one-shot initialised flag and I could not test a change there without reworking that. Happy to follow up if you want it covered.

Built this with Claude Code's help and reviewed the diff myself.

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📝 Walkthrough

Walkthrough

getInProcessConfig now omits environment when LOGFIRE_ENVIRONMENT resolves to an empty string. Non-empty values remain in the trace configuration. Tests cover both cases. A patch changeset documents the update for @pydantic/logfire-cf-workers.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: omitting blank environment bindings.
Description check	✅ Passed	The description accurately explains the defect, fix, tests, and package scope, and it relates directly to the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In @.changeset/cf-blank-environment.md:
- Line 5: Update the changeset note to document that deployment.environment.name
is omitted whenever the resolved environment is empty, including both a blank
LOGFIRE_ENVIRONMENT binding and an explicit environment: '' passed to
instrumentInProcess.

In `@packages/logfire-cf-workers/src/index.ts`:
- Around line 105-108: Update instrumentInProcess to destructure and discard
config.environment before spreading the remaining config, so an explicitly empty
environment is omitted rather than retained. Preserve the resolvedEnvironment
guard for adding a non-empty environment value, and add a regression test
covering config with environment set to an empty string.

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📒 Files selected for processing (3)

• .changeset/cf-blank-environment.md
• packages/logfire-cf-workers/src/index.test.ts
• packages/logfire-cf-workers/src/index.ts

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[ayaangazali]

Seven days on this one, so a status note rather than a new question.

Still reproduces on 3d33c49: envString returns the empty string for a binding declared without a value, '' !== undefined is true, so deployment.environment.name: "" is stamped on every span. The explicit-option half is the same, because ...config spreads environment in ahead of the guard.

Green, no conflicts, no drift on the two files it touches. The CodeRabbit review from the 23rd is addressed.

Happy to close it if the blank case is not one you want handled, or if it is better folded into a wider pass over the Cloudflare config. Either is fine, I would just rather not leave it sitting in your queue.

Built this with Claude Code's help and reviewed the diff myself.

[ayaangazali]

One piece of evidence I should have put in the original body, since it answers the "is this wanted" question better than my description did: the other two runtime packages already do this.

logfire-node runs its resource attributes through removeEmptyKeys (sdk.ts:339), whose comment names the reason directly, that Python guards each of these fields with if self.environment:. logfire-browser guards the same field inline (index.ts:477):

...(options.environment !== undefined && options.environment !== ''
  ? { [ATTR_DEPLOYMENT_ENVIRONMENT_NAME]: options.environment }
  : {}),

So an empty deployment.environment.name is already treated as absent in Node and in the browser, and Cloudflare Workers is the only package that stamps it. That makes this a consistency fix rather than a new opinion, which is not how I framed it originally.

It also matters more here than in the other two, because in Workers the empty string arrives on its own from a binding declared without a value, rather than from someone passing '' explicitly.

Built this with Claude Code's help and reviewed the diff myself.