chore: import upstream snapshot with attribution

scripts/sync-trace-spans-contract.ts

@@ -0,0 +1,143 @@
+import { mkdir, readFile, writeFile } from 'node:fs/promises'
+import { dirname, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { formatGeneratedSource } from './format-generated-source'
+
+/**
+ * Generate `apps/sim/lib/copilot/generated/trace-spans-v1.ts` from the
+ * Go-side `contracts/trace-spans-v1.schema.json` contract.
+ *
+ * The contract is a single-enum JSON Schema. We emit:
+ *   - A `TraceSpansV1Name` const object (key-as-value) for ergonomic
+ *     access: `TraceSpansV1Name['copilot.vfs.read_file']`.
+ *   - A `TraceSpansV1NameValue` union type.
+ *   - A sorted `TraceSpansV1Names` readonly array (useful for tests that
+ *     verify coverage, and for tooling that wants to enumerate names).
+ *
+ * We deliberately do NOT pass through `json-schema-to-typescript` —
+ * it would generate a noisy `TraceSpansV1` object type for the wrapper
+ * that drives reflection; the wrapper type has no runtime use on the Sim
+ * side and would obscure the actual enum.
+ */
+const SCRIPT_DIR = dirname(fileURLToPath(import.meta.url))
+const ROOT = resolve(SCRIPT_DIR, '..')
+const DEFAULT_CONTRACT_PATH = resolve(
+  ROOT,
+  '../copilot/copilot/contracts/trace-spans-v1.schema.json'
+)
+const OUTPUT_PATH = resolve(ROOT, 'apps/sim/lib/copilot/generated/trace-spans-v1.ts')
+
+function extractSpanNames(schema: Record<string, unknown>): string[] {
+  const defs = (schema.$defs ?? {}) as Record<string, unknown>
+  const nameDef = defs.TraceSpansV1Name
+  if (
+    !nameDef ||
+    typeof nameDef !== 'object' ||
+    !Array.isArray((nameDef as Record<string, unknown>).enum)
+  ) {
+    throw new Error('trace-spans-v1.schema.json is missing $defs.TraceSpansV1Name.enum')
+  }
+  const enumValues = (nameDef as Record<string, unknown>).enum as unknown[]
+  if (!enumValues.every((v) => typeof v === 'string')) {
+    throw new Error('TraceSpansV1Name enum must be string-only')
+  }
+  return (enumValues as string[]).slice().sort()
+}
+
+/**
+ * Convert a wire name like "copilot.recovery.check_replay_gap" into an
+ * identifier-safe PascalCase key like "CopilotRecoveryCheckReplayGap",
+ * so call sites read as `TraceSpan.CopilotRecoveryCheckReplayGap`
+ * instead of `TraceSpan["copilot.recovery.check_replay_gap"]`.
+ *
+ * Splits on `.`, `_`, and non-alphanumeric characters; capitalizes each
+ * part; collapses. Strict mapping (not a best-effort heuristic), so the
+ * same input always produces the same identifier.
+ */
+function toIdentifier(name: string): string {
+  const parts = name.split(/[^A-Za-z0-9]+/).filter(Boolean)
+  if (parts.length === 0) {
+    throw new Error(`Cannot derive identifier for span name: ${name}`)
+  }
+  const ident = parts.map((p) => p.charAt(0).toUpperCase() + p.slice(1).toLowerCase()).join('')
+  // Safety: identifiers may not start with a digit.
+  if (/^[0-9]/.test(ident)) {
+    throw new Error(`Derived identifier "${ident}" for span "${name}" starts with a digit`)
+  }
+  return ident
+}
+
+function render(spanNames: string[]): string {
+  const pairs = spanNames.map((name) => ({ name, ident: toIdentifier(name) }))
+
+  // Guard against collisions: if two wire names ever collapse to the
+  // same PascalCase identifier, we want a clear build failure, not a
+  // silent override.
+  const seen = new Map<string, string>()
+  for (const p of pairs) {
+    const prev = seen.get(p.ident)
+    if (prev && prev !== p.name) {
+      throw new Error(`Identifier collision: "${prev}" and "${p.name}" both map to "${p.ident}"`)
+    }
+    seen.set(p.ident, p.name)
+  }
+
+  const constLines = pairs.map((p) => `  ${p.ident}: ${JSON.stringify(p.name)},`).join('\n')
+  const arrayEntries = spanNames.map((n) => `  ${JSON.stringify(n)},`).join('\n')
+
+  return `// AUTO-GENERATED FILE. DO NOT EDIT.
+//
+// Source: copilot/copilot/contracts/trace-spans-v1.schema.json
+// Regenerate with: bun run trace-spans-contract:generate
+//
+// Canonical mothership OTel span names. Call sites should reference
+// \`TraceSpan.<Identifier>\` (e.g. \`TraceSpan.CopilotVfsReadFile\`)
+// rather than raw string literals, so the Go-side contract is the
+// single source of truth and typos become compile errors.
+
+export const TraceSpan = {
+${constLines}
+} as const;
+
+export type TraceSpanKey = keyof typeof TraceSpan;
+export type TraceSpanValue = (typeof TraceSpan)[TraceSpanKey];
+
+/** Readonly sorted list of every canonical span name. */
+export const TraceSpanValues: readonly TraceSpanValue[] = [
+${arrayEntries}
+] as const;
+`
+}
+
+async function main() {
+  const checkOnly = process.argv.includes('--check')
+  const inputArg = process.argv.find((a) => a.startsWith('--input='))
+  const inputPath = inputArg
+    ? resolve(ROOT, inputArg.slice('--input='.length))
+    : DEFAULT_CONTRACT_PATH
+
+  const raw = await readFile(inputPath, 'utf8')
+  const schema = JSON.parse(raw)
+  const spanNames = extractSpanNames(schema)
+  const rendered = formatGeneratedSource(render(spanNames), OUTPUT_PATH, ROOT)
+
+  if (checkOnly) {
+    const existing = await readFile(OUTPUT_PATH, 'utf8').catch(() => null)
+    if (existing !== rendered) {
+      throw new Error(
+        'Generated trace spans contract is stale. Run: bun run trace-spans-contract:generate'
+      )
+    }
+    console.log('Trace spans contract is up to date.')
+    return
+  }
+
+  await mkdir(dirname(OUTPUT_PATH), { recursive: true })
+  await writeFile(OUTPUT_PATH, rendered, 'utf8')
+  console.log(`Generated trace spans types -> ${OUTPUT_PATH}`)
+}
+
+main().catch((err) => {
+  console.error(err)
+  process.exit(1)
+})