@braincloud/cloudsync-core

Host-agnostic format and sync logic for brainCloud cloud-code. Shared by the local helper MCP (@braincloud/mcp-helper) and the VS Code extension (braincloud-vscode-fsprovider) so the on-disk contract lives in exactly one place.

No host dependencies — no vscode, no MCP SDK. Pure data in, data out. File I/O and UI are the consuming host's job.

On-disk contract

• .ccjs — a script: its body followed by an optional brainCloud metadata comment block.
• .bcsync — committed, team-shared: maps each git branch to the brainCloud app it targets.
• .bcsync.local — gitignored, per-machine: last-synced version + content hash per script.

API

Metadata block (.ccjs)

import { parseCcjs, buildCcjs } from '@braincloud/cloudsync-core';

const { body, metadata, hasMetadataBlock } = parseCcjs(fileContent);
const fileContent = buildCcjs(body, { scriptName: 'doThing', clientCallable: true, scriptTimeout: 30 });

buildCcjs emits the server-exact marker, scriptName first (the server splits on it), no trailing comma on the last line, and scriptTimeout (not scriptTimeoutSecs). parseCcjs returns {} metadata for content-only files.

Field classes: AUTHORITATIVE_FIELDS (synced both ways), BOOKKEEPING_FIELDS (server-owned; never authoritative on push), HASH_META_FIELDS (the subset that feeds change detection).

Change detection

import { computeSyncHash } from '@braincloud/cloudsync-core';

const sha256 = computeSyncHash({ body, metadata });

Git-robust: line endings/trailing whitespace normalised; server bookkeeping (version/updatedAt/…) and positional fields (scriptName/folderPath) excluded, so a plain re-export, a checkout, or a rename/move is not mistaken for a content edit.

Sync state

import { classifyScripts } from '@braincloud/cloudsync-core';

const statuses = classifyScripts({ local, base, remote });
// → [{ path, action, reason }], action ∈
//   in-sync | pull | push | pull-new | push-new | converged | conflict | delete-local | delete-remote

Cheap diff: remote-changed = remote.version !== base.version; local-changed = local.hash !== base.sha256. Remote content is only needed to distinguish conflict from converged.

Config files

import { parseBcSync, resolveBranchApp, parseBcSyncLocal, upsertBranchScript } from '@braincloud/cloudsync-core';

const cfg = parseBcSync(text);
const app = resolveBranchApp(cfg, currentBranch); // undefined ⇒ caller must refuse, never guess

upsertBranchScript keeps the richer scripts map and the VS Code-compat scriptVersions map consistent; unknown fields written by other tools are preserved on round-trip.

Zip (bulk import / export)

import { buildImportZip, expandExportZip } from '@braincloud/cloudsync-core';

const zip = buildImportZip([{ path: 'utils/game/saveProgress', body, metadata }]); // → POST /scripts
const scripts = expandExportZip(downloadedZipBytes);                               // ← GET /script?export

Entries are named by full path (collision-free), but folder placement is driven by the folderPath field written into each block — the server discards zip entry folder paths.

Develop

npm install
npm test --workspace @braincloud/cloudsync-core
npm run build --workspace @braincloud/cloudsync-core