fix(constants): inline LIB_VERSION via codegen to fix compiled output

[marnelram]

Fixes #1138.

Problem

src/constants/resourceFetcher.ts reads the version with require('../../package.json').version. From src/constants/, that path resolves to the package root — correct. But react-native-builder-bob's module target emits the file at lib/module/constants/, one level deeper, and the babel transform leaves the relative require literal unchanged. From the compiled location, ../../package.json is lib/package.json — a file that doesn't exist. Any bundler that resolves through "main" / "module" (web bundlers, Node) blows up.

iOS/Android Metro is unaffected because the package's "react-native": "src/index" field sends Metro to the source directly.

Fix

Generate the version into a committed source file instead of requiring package.json at runtime.

• New scripts/sync-version.cjs: reads package.json#version, writes src/constants/libVersion.ts.
• New src/constants/libVersion.ts: holds export const LIB_VERSION: string = '<version>'. Header marks it auto-generated.
• src/constants/resourceFetcher.ts: re-exports LIB_VERSION from ./libVersion.
• package.json:
  • scripts.prepare: node scripts/sync-version.cjs && bob build — regenerate before every build.
  • scripts.version: node scripts/sync-version.cjs && git add src/constants/libVersion.ts — keeps the committed file in sync with npm version <bump>.

Why this shape

• No runtime JSON require, so no relative-path fragility across output layouts.
• Single source of truth stays package.json#version; the committed libVersion.ts is regenerated before publish and before any version bump.
• RN consumers reading src/ directly (via the react-native entry) get the committed file — still correct, since it's refreshed at version-bump time.
• No new dependencies.

Verification

yarn workspace react-native-executorch run prepare
# → [sync-version] wrote .../src/constants/libVersion.ts (LIB_VERSION=0.9.0)
# → ✔ [module] Wrote files to lib/module
# → ✔ [typescript] Wrote definition files to lib/typescript

After build, lib/module/constants/resourceFetcher.js:

"use strict";
export const DOWNLOAD_EVENT_ENDPOINT = 'https://ai.swmansion.com/telemetry/downloads/api/downloads';
export { LIB_VERSION } from './libVersion';

And the new lib/module/constants/libVersion.js:

"use strict";
// AUTO-GENERATED by scripts/sync-version.cjs — do not edit by hand.
// Source of truth: package.json#version.
export const LIB_VERSION = '0.9.0';

yarn workspace react-native-executorch run typecheck, prettier --check, and eslint on the touched files all pass.

[chmjkb]

cc @mkopcins, i believe we can also use that new constant for the model urls to avoid duplicating