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fix(automation): flow string templates serialize object tokens readably, never [object Object] (#3450) - #3470
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…ly, never [object Object] (#3450) A flow string field embedding an object-valued token — notably the engine's `$error` ({nodeId, message, ...}) in a fault handler's notify body — rendered as [object Object]: interpolateString's multi-token branch and notify-node both coerced via String(). - New shared stringifyForTemplate helper (builtin/template.ts): objects/arrays JSON-serialized (legible, still carries the message), primitives pass through, null/undefined → ''. - interpolateString embedded branch + notify-node title/body use it. Sole-token branch still returns the raw value (typed fields keep their type); {$error.message} still resolves to the message string. Split from #3425 (readonly-strip half shipped in #3465). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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📓 Docs Drift CheckThis PR changes 1 package(s): 6 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:
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What & why
Closes#3450 (split from #3425; the readonly-strip half shipped in #3465).
A flow string field that embeds an object-valued token rendered as the useless
[object Object]. The most common trigger is a fault handler surfacing the engine's$error— set as an object{nodeId, message, output}(engine.ts:2585) — in anotifybody (message: 'Conversion failed: {$error}'), or any node writing an object token into a string field.Two coercion sites produced it:
interpolateString's multi-token branch didString(value)(builtin/template.ts).notify-nodedidString(interpolate(...))for title/body — a sole{$error}token resolves to the raw object, thenString()→[object Object].Fix
stringifyForTemplate(value)helper: objects/arrays →JSON.stringify(legible, still carries the message), primitives →String,null/undefined→''.interpolateString's embedded branch andnotify-node's title/body.fields: { count: '{n}' }stays a number), and{$error.message}still resolves to just the message string — the documented cleanest author form.Notes on scope
The originally-reported 16.1.0 symptom (a failed
create_record's own error as[object Object]) is already fixed on main —crud-nodesreturns(err as Error).message, and both objectui runs surfaces render readably (FlowRunsPanelvia a.messagehelper,FlowRunsPageviaJSON.stringify). This PR closes the remaining, demonstrable platform path: object tokens in flow string templates.Verification
template-object-token.test.ts(7 cases): embedded$error→ readable JSON (asserts not[object Object], contains the message);{$error.message}→ message string; sole token preserves the raw object; primitives unchanged; circular object doesn't throw.String()fails exactly the embedded-object test.@objectstack/service-automationsuite green (354 tests, incl. notify-node).🤖 Generated with Claude Code