From a1bd2e9b93dc290a404983b30b26ae54b1b94d26 Mon Sep 17 00:00:00 2001
From: Alexandre Bourdin <abourdin@users.noreply.github.com>
Date: Fri, 27 Mar 2026 12:29:47 +0100
Subject: [PATCH] Merge pull request #32441 from
 overleaf/ab-script-insert-alpha-version-0

[web] Add script to insert missing 0% rollout alpha phase version to existing feature flag

GitOrigin-RevId: 56dc4c74e5f7f5141647fd71f64df71a1264734e
---
 .../insert_feature_flag_alpha_phase_0.mjs     | 129 ++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 services/web/scripts/insert_feature_flag_alpha_phase_0.mjs

diff --git a/services/web/scripts/insert_feature_flag_alpha_phase_0.mjs b/services/web/scripts/insert_feature_flag_alpha_phase_0.mjs
new file mode 100644
index 0000000000..101d01a8c3
--- /dev/null
+++ b/services/web/scripts/insert_feature_flag_alpha_phase_0.mjs
@@ -0,0 +1,129 @@
+import { scriptRunner } from './lib/ScriptRunner.mjs'
+import { db } from '../app/src/infrastructure/mongodb.mjs'
+import minimist from 'minimist'
+
+const argv = minimist(process.argv.slice(2))
+const commit = argv.commit !== undefined
+const splitTestName = argv._[0]
+
+if (!splitTestName) {
+  console.error(
+    'Usage: node scripts/insert_feature_flag_alpha_phase_0.mjs <split-test-name> [--commit]'
+  )
+  console.error(
+    '\nInserts a new version 1 (alpha phase, 0% rollout, active) and renumbers existing versions.'
+  )
+  console.error('Without --commit, runs in dry-run mode and shows a diff.')
+  process.exit(1)
+}
+
+if (!commit) {
+  console.log('DOING DRY RUN. TO SAVE CHANGES PASS --commit')
+}
+
+const RED = '\x1b[31m'
+const GREEN = '\x1b[32m'
+const RESET = '\x1b[0m'
+
+function formatDiff(before, after) {
+  const aLines = before.split('\n')
+  const bLines = after.split('\n')
+  const m = aLines.length
+  const n = bLines.length
+
+  const dp = Array.from({ length: m + 1 }, () => Array(n + 1).fill(0))
+  for (let i = 1; i <= m; i++) {
+    for (let j = 1; j <= n; j++) {
+      if (aLines[i - 1] === bLines[j - 1]) {
+        dp[i][j] = dp[i - 1][j - 1] + 1
+      } else {
+        dp[i][j] = Math.max(dp[i - 1][j], dp[i][j - 1])
+      }
+    }
+  }
+
+  const result = []
+  let i = m
+  let j = n
+  while (i > 0 || j > 0) {
+    if (i > 0 && j > 0 && aLines[i - 1] === bLines[j - 1]) {
+      result.unshift(`  ${aLines[i - 1]}`)
+      i--
+      j--
+    } else if (j > 0 && (i === 0 || dp[i][j - 1] >= dp[i - 1][j])) {
+      result.unshift(`${GREEN}+ ${bLines[j - 1]}${RESET}`)
+      j--
+    } else {
+      result.unshift(`${RED}- ${aLines[i - 1]}${RESET}`)
+      i--
+    }
+  }
+
+  return result.join('\n')
+}
+
+async function main() {
+  const splitTest = await db.splittests.findOne({ name: splitTestName })
+
+  if (!splitTest) {
+    throw new Error(`Split test '${splitTestName}' not found`)
+  }
+
+  if (!splitTest.versions || splitTest.versions.length === 0) {
+    throw new Error(`Split test '${splitTestName}' has no versions`)
+  }
+
+  const firstVersion = splitTest.versions[0]
+
+  const newVersion = {
+    ...firstVersion,
+    versionNumber: 1,
+    phase: 'alpha',
+    active: true,
+    variants: firstVersion.variants.map(v => ({
+      ...v,
+      rolloutPercent: 0,
+      rolloutStripes: [],
+    })),
+    createdAt: new Date(firstVersion.createdAt.getTime() - 1000),
+    comment: `Inserted alpha phase 0% rollout version (based on v${firstVersion.versionNumber})`,
+  }
+
+  const updatedVersions = [
+    newVersion,
+    ...splitTest.versions.map(v => ({
+      ...v,
+      versionNumber: v.versionNumber + 1,
+    })),
+  ]
+
+  const beforeStr = JSON.stringify(splitTest.versions, null, 2)
+  const afterStr = JSON.stringify(updatedVersions, null, 2)
+
+  console.log(`\nSplit test: ${splitTestName}`)
+  console.log(`Current versions: ${splitTest.versions.length}`)
+  console.log(`After: ${updatedVersions.length} versions`)
+  console.log('\n--- versions diff ---')
+  console.log(formatDiff(beforeStr, afterStr))
+  console.log('--- end diff ---\n')
+
+  if (commit) {
+    await db.splittests.updateOne(
+      { name: splitTestName },
+      { $set: { versions: updatedVersions } }
+    )
+    console.log(
+      `Successfully inserted alpha phase 0% version for '${splitTestName}'`
+    )
+  } else {
+    console.log('Dry run complete. Pass --commit to apply changes.')
+  }
+}
+
+try {
+  await scriptRunner(main)
+  process.exit(0)
+} catch (error) {
+  console.error(error)
+  process.exit(1)
+}