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Merge pull request #260 from contentstack/feat/dx-5367-add-cursor-rules-skills
docs: add AGENTS.md, Cursor rules, and agent skills (DX-5367)
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‎.cursor/rules/README.md‎

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# Cursor rules — `@contentstack/utils`
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This folder holds project-specific rules for AI assistants working in **contentstack-utils-javascript**. For the full project overview, see **[`AGENTS.md`](../../AGENTS.md)** at the repository root.
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## How rules are picked up
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Each rule is a `.md`/`.mdc` file. Files with YAML frontmatter can set `description`, `globs`, and `alwaysApply`. Cursor uses these to decide when a rule is included in context.
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### Referencing rules in chat
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In Cursor, you can **`@`-mention** a rule file (e.g. type `@` and choose the rule from the list) to force its guidance into the conversation. The file name (without extension) is the usual handle, e.g. **`typescript`**, **`testing`**, **`code-review`**.
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## Rule index
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| File | `alwaysApply` | Globs | When it applies |
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|------|----------------|-------|------------------|
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| [`dev-workflow.md`](dev-workflow.md) | no | *(none)* | Branching, CI alignment, commits, releases, and day-to-day commands for this repo. |
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| [`typescript.mdc`](typescript.mdc) | no | `src/**/*.ts`, `__test__/**/*.ts` | TypeScript version, layout, ESLint/Prettier, strictness, imports. |
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| [`typescript-contentstack-utils.mdc`](typescript-contentstack-utils.mdc) | no | `src/**/*.ts` | Delivery-oriented utils only: RTE rendering, GQL helpers, endpoints JSON, Live Preview tags—**not** full CDA/CMA SDK surface. |
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| [`testing.mdc`](testing.mdc) | no | `__test__/**/*.ts` | Jest, jsdom, mocks, coverage output paths, no live-test env. |
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| [`code-review.mdc`](code-review.mdc) | **yes** | *(global)* | PR checklist: public API docs, compatibility, errors, dependencies, terminology (utils + delivery context). |
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## Related
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- **[`AGENTS.md`](../../AGENTS.md)** — Single entry point (package purpose, stack, commands).
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- **[`skills/README.md`](../../skills/README.md)** — Longer-form skill docs for the same themes.

‎.cursor/rules/code-review.mdc‎

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---
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description: PR review checklist for @contentstack/utils — API docs, compatibility, security, testing
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alwaysApply: true
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---
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# Code review checklist — `@contentstack/utils`
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Use severity labels (**Blocker / Major / Minor**) when triaging findings.
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## Public API and documentation
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- **Blocker/Major:** New or changed **exports** from `src/index.ts` need accurate **JSDoc** (or clear type names) matching runtime behavior.
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- **Major:** README / CHANGELOG updates when behavior is user-visible or migration is needed.
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## Backward compatibility
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- **Blocker:** Unplanned breaking changes to **function signatures** or **default behavior** consumed by Delivery SDK integrations or documented `renderOption` contracts.
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- **Major:** Stricter throwing on inputs that previously passed (especially `getContentstackEndpoint`, RTE traversals).
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## Errors
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- This package uses **plain `Error`** (e.g. `endpoints.ts`); new code should keep messages actionable. **Major:** Silent failures where callers need to detect bad input.
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## Null safety and RTE edge cases
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- **Major:** Missing guards on **null/undefined** node or entry fragments (historically sensitive in `entry-editable` / RTE paths).
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- **Minor:** Align with **`strictNullChecks: false`** legacy but avoid widening undefined leaks into public types.
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## Dependencies and SCA
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- **Major:** New runtime deps are rare—justify any addition; **`prepublishOnly`** and hooks assume **`npm test`** and Snyk-friendly trees.
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- Use **`npm audit` / Snyk** expectations per org policy.
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## Tests
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- **Blocker:** Behavioral fixes or new branches without **`__test__`** coverage when risk is high (RTE nesting, GQL URL rewriting, endpoint resolution).
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- **Minor:** Snapshot-only tests where a small assertion would be clearer.
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## Terminology
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- **Major:** Docs/comments must describe this as **utils** alongside **CDA / Delivery / JSON RTE / GraphQL**, not as **CMA** unless the change is explicitly management-related.

‎.cursor/rules/dev-workflow.md‎

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---
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description: Branching, CI, local commands, commit hooks, and release flow for contentstack-utils-javascript
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alwaysApply: false
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---
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# Dev workflow — `@contentstack/utils`
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## Branches and PRs
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- **CI** (`Unit-Test-CI`) runs on **push/PR** to `development`, `staging`, and `master` (see `.github/workflows/ci.yml`).
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- **Branch protection:** A workflow fails PRs that target **`staging`** when the head branch is **not** `development` (see `.github/workflows/check-branch.yml`). Prefer **`development`** as the integration branch when contributing upstream.
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- Target the branch your team uses for integration; align with maintainers if unsure.
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## Local development
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| Task | Command / note |
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|------|----------------|
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| Build | `npm run build` (runs `prebuild`: clean `dist`, `download-regions`, then `tsc` + Rollup) |
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| Test | `npm test` (includes `pretest` → build; Jest + coverage; `reports/`) |
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| Format | `npm run format` (Prettier: `src/**/*.ts`) |
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| ESLint | No `lint` script in `package.json`; run e.g. `npx eslint src __test__` using `eslint.config.js` |
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## Git hooks (Husky)
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- **`commit-msg`:** [Conventional Commits](https://www.conventionalcommits.org/) via **`commitlint`** (`.commitlintrc.json`).
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- **`pre-commit`:** Requires **Snyk** (`snyk test --all-projects`) and **Talisman** installed locally. Set `SKIP_HOOK=1` to bypass (documented in the hook).
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## PR expectations
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- **`npm test`** passes (build + unit tests).
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- **CHANGELOG.md** updated for user-visible changes when maintainers expect it.
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- **Dependencies:** Be mindful of Snyk/SCA workflows; security-relevant bumps should be justified.
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## Releases and versioning
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- **Package version** lives in **`package.json`** (also reflected in **`CHANGELOG.md`**).
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- **`prepublishOnly`** runs **`npm test`** before publish.
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- **NPM / GitHub Packages:** Publishing is driven by **GitHub release `created`** (`.github/workflows/npm-publish.yml`); requires maintainer secrets (`NPM_TOKEN`, `GIT_TOKEN`). Bump version and changelog in the same change set as the release your team uses.

‎.cursor/rules/testing.mdc‎

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---
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description: Jest tests, mocks, reports, and environments for @contentstack/utils
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globs:
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- __test__/**/*.ts
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alwaysApply: false
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---
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# Testing — `@contentstack/utils`
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## Framework
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- **Jest 29** with **`ts-jest`** preset (`jest.config.ts`).
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- **Environment:** **`jsdom`** (suitable for HTML string assertions and DOM-related behavior).
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## Discovery and naming
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- **Pattern:** `**/__test__/**/?(*.)+(spec|test).[jt]s?(x)` — this repo uses `*.test.ts` under **`__test__/`**.
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- **Mocks / fixtures:** `__test__/mock/*.ts` — follow existing mock naming (`*-mock.ts`).
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## Coverage and reports
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- **Coverage** is collected from `src/**` excluding `src/index.ts` (`collectCoverageFrom`).
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- Outputs: **`reports/coverage/`**, **`reports/html/`** (jest-html-reporters), **`reports/junit/`** (jest-junit), **`reports/report.json`** (from `npm test` script).
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## Running tests
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| Command | Behavior |
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|---------|----------|
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| `npm test` | Runs **`pretest` → build** then Jest (CI-aligned). |
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| `npm run test:debug` | Watch mode, `--runInBand`. |
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## Integration / live tests
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- **None** in this repo. No `.env` or stack credentials required for **`npm test`**.
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## Build dependency
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- **`npm test` always builds first** (`pretest`). Ensure **`src/assets/regions.json`** exists or can be downloaded so `endpoints` tests pass.

‎.cursor/rules/typescript-contentstack-utils.mdc‎

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---
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description: Contentstack utils package patterns — RTE, embedded items, GQL, endpoints (delivery-oriented companion, not CDA/CMA SDK)
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globs:
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- src/**/*.ts
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alwaysApply: false
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---
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# `@contentstack/utils` — domain patterns
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This repository implements **companion utilities** for Contentstack **content consumption** scenarios (typically with the **Delivery SDK** and **CDA / GraphQL** responses). It does **not** implement stack configuration, delivery tokens, or HTTP clients—callers fetch entry JSON elsewhere and pass it into these helpers.
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## Mental model
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| Area | Source anchors | Notes |
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|------|----------------|-------|
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| Render options / callbacks | `src/options/`, `src/render-embedded-objects.ts` | `RenderOption`-style maps: node types, marks, `block` / `inline` embeds, `reference`, `display`, `default`. |
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| JSON RTE → HTML | `src/json-to-html.ts`, `src/nodes/*`, `src/helper/*` | Supercharged RTE path uses `paths` arrays for nested fields (see `README.md`). |
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| Embedded object types | `src/Models/embedded-object.ts`, `src/Models/json-rte-model.ts` | Align typings with shapes coming from **delivery** entry JSON, not management APIs. |
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| GraphQL | `src/gql.ts`, `src/updateAssetURLForGQL.ts` | Docs/comments describe use **after** GraphQL fetches; asset URL rewriting is response-shape specific. |
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| Live Preview / CSLP tags | `src/entry-editable.ts` | `addTags` / exported `addEditableTags` — preserve existing attribute and locale behavior when changing tag generation. |
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| Region endpoints | `src/endpoints.ts` | **`getContentstackEndpoint(region, service?, omitHttps?)`** reads **`src/assets/regions.json`**; throws plain `Error` with human-readable messages on bad region/service. |
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## Terminology
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- Prefer **CDA / Delivery / JSON RTE / GraphQL** vocabulary when describing behavior—**not** CMA unless you are explicitly discussing something management-only (rare here).
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- **“SDK”** in docs often means **this utils package** or the **Delivery SDK** together—disambiguate in user-facing text.
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## Concurrency / IO
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- Pure synchronous transforms dominate; no retry or rate-limit layer. Do not add HTTP clients without an explicit product requirement.
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## Official docs alignment
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- Behavior should stay consistent with current **Content Delivery** / **Live Preview** / **JSON RTE** documentation. When in doubt, cite the relevant Contentstack doc set in PR descriptions rather than guessing CMS semantics.

‎.cursor/rules/typescript.mdc‎

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---
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description: TypeScript conventions for @contentstack/utils (src and tests)
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globs:
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- src/**/*.ts
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- __test__/**/*.ts
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alwaysApply: false
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---
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# TypeScript — `@contentstack/utils`
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## Tooling
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- **TypeScript ~4.9** (`package.json`, `tsconfig.json`).
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- **Bundler output:** `tsc` emits to `dist/lib` with declarations in `dist/types`; **Rollup** produces `dist/index.es.js` (`rollup.config.js`).
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- **Strict mode** is on with **`strictNullChecks: false`** — new code should still minimize unnecessary null/undefined gaps when touching APIs.
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## Layout
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- **Library code:** `src/**/*.ts` only (`tsconfig.json` `include`); **tests** are under `__test__/` (excluded from `tsc` program but type-checked via Jest/tsconfig paths).
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- **Public exports:** Maintain **`src/index.ts`** as the single export surface unless intentionally adding secondary entry points.
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## Style and lint
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- Match existing naming (PascalCase types, camelCase functions, existing file layout under `Models/`, `nodes/`, `helper/`, `options/`).
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- **ESLint** flat config: `eslint.config.js` — `@typescript-eslint` recommended for `__test__`; source files use `js.configs.recommended` baseline.
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- **Prettier:** `npm run format` scopes `src/**/*.ts`; keep formatting consistent when editing tests too.
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## JSON / assets
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- **`src/assets/regions.json`:** Consumed by `src/endpoints.ts`; populated by **`npm run download-regions`** during `prebuild`. Do not assume the file is committed (see root `.gitignore`).
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## Logging
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- No shared logger dependency; avoid introducing `console` noise in library paths unless consistent with nearby code.

‎.github/workflows/sca-scan.yml‎

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SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
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with:
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args: --all-projects --fail-on=all
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json: true
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continue-on-error: true
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- uses: contentstack/sca-policy@main

‎.talismanrc‎

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checksum: a843710fc9f54bf4c7996f39561dc66491d62a9d9eeca50fa2c7c37bd6141f53
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- filename: src/render-embedded-objects.ts
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checksum: 35d56d4f7b625611fef18414fccdbff014c1d90d02e17eb0efa4d6166b73e23b
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- filename: .cursor/rules/code-review.mdc
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checksum: 43d4fddb706e5ad6c92fe0af30bd5f44eec9b83c31dc93d3d4cc5e6208d351cc
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- filename: .cursor/rules/dev-workflow.md
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checksum: b9a4d68439ce9564730506ab6c4712f5034a645858bdb78ac57e43ba183cb981
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- filename: skills/code-review/SKILL.md
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checksum: 4ec638a87a795e5cc0b0e66b569e04749cb27f9d3be29d4ea69f56b48225c943

‎AGENTS.md‎

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# Agent guidance — `@contentstack/utils`
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## What this package is
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**[@contentstack/utils](https://www.npmjs.com/package/@contentstack/utils)** (`contentstack-utils-javascript`) is a **JavaScript/TypeScript utilities library** for Contentstack. It is **not** the Content Delivery API (CDA) SDK or the Content Management API (CMA) SDK. It focuses on **JSON RTE / Supercharged RTE** rendering (`jsonToHTML`), **embedded entry and asset** rendering (`render`, `renderContent`), **GraphQL-oriented helpers** (`GQL`, `updateAssetURLForGQL`), **Live Preview–style editable tags** (`addEditableTags` / `addTags`), and **region endpoint lookup** (`getContentstackEndpoint`). Typical usage is **alongside** the Delivery SDK (see repository `README.md` examples with `@contentstack/delivery-sdk`).
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- **Repository:** [github.com/contentstack/contentstack-utils-javascript](https://github.com/contentstack/contentstack-utils-javascript)
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## Tech stack
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| Area | Details |
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|------|---------|
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| Language | TypeScript **4.9** (`tsconfig.json`, `strict: true`, `strictNullChecks: false`) |
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| Build | **TypeScript** (`tsc`) → `dist/lib`; **Rollup** (`rollup -c`) → `dist/index.es.js`; types in `dist/types/` |
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| Test | **Jest 29** + **ts-jest**, **jsdom** environment (`jest.config.ts`) |
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| Lint / format | **ESLint 9** flat config (`eslint.config.js`); **Prettier 3** (`npm run format`) — there is **no** `lint` npm script; use `npx eslint` as needed |
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| Runtime HTTP / JSON for API calls | **None** in library code; `regions.json` is a **build-time** asset (see below) |
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## Source layout and public API
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| Role | Path |
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|------|------|
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| Public entry (sources) | `src/index.ts` |
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| Options / render types | `src/options/` |
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| RTE / node model | `src/Models/`, `src/nodes/` |
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| Helpers | `src/helper/` |
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| GQL + asset URL rewrite | `src/gql.ts`, `src/updateAssetURLForGQL.ts` |
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| Endpoints helper | `src/endpoints.ts` + `src/assets/regions.json` (generated; see build) |
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| Published bundle | `dist/` (per `package.json` `main` / `types`) |
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## Common commands
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| Command | Purpose |
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|---------|---------|
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| `npm run build` | Cleans `dist`, ensures `src/assets/regions.json` (download or warning), runs `tsc` + Rollup |
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| `npm test` | Runs `pretest` → **build**, then Jest with coverage; outputs under `reports/` |
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| `npm run test:debug` | Jest watch, in-band |
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| `npm run format` | Prettier on `src/**/*.ts` |
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| `npm run download-regions` | Fetches `regions.json` only (used by `prebuild`) |
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**Tests:** Unit tests only, under `__test__/**/*.test.ts`, with mocks in `__test__/mock/`. There are **no** live/integration tests requiring stack credentials in this repository.
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## Credentials / environment
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- **Unit tests:** No API keys or `.env` required.
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- **Build:** `download-regions` calls a public URL (`artifacts.contentstack.com`); offline builds may warn and rely on an existing `src/assets/regions.json`. Note `regions.json` is listed in `.gitignore`; clones may need a successful `npm run build` (or manual file) before tests pass.
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- **Publish:** GitHub release workflow uses `NPM_TOKEN` / `GIT_TOKEN` secrets (maintainers only).
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## More detail for AI / IDE rules
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- [`.cursor/rules/README.md`](.cursor/rules/README.md) — Cursor rules index (`alwaysApply`, globs, when to use).
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- [`skills/README.md`](skills/README.md) — Topic skills (testing, code review, package mental model).

‎skills/README.md‎

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# Skills — `@contentstack/utils`
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Short-form guides for humans and agents. Root context: **[`AGENTS.md`](../AGENTS.md)**. Cursor rule index: **[`.cursor/rules/README.md`](../.cursor/rules/README.md)**.
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| Skill | When to use |
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|-------|--------------|
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| [`code-review/`](code-review/SKILL.md) | Before opening or approving a PR; expanded checklist (API docs, compatibility, errors, tests, terminology). |
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| [`testing/`](testing/SKILL.md) | Running Jest, understanding `pretest`/build, mocks, reports, and why no live API tests exist here. |
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| [`typescript-contentstack-utils/`](typescript-contentstack-utils/SKILL.md) | Mental map of RTE/embed/GQL/endpoints/Live Preview code paths and where to change behavior safely. |
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There is **no** separate `framework` skill: this repo has **no** shared HTTP client or retry layer.

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