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‎.github/workflows/build-sample-project.yml

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on:
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pull_request:
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push:
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branches:
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- main
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jobs:
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build-sample-project:
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name: Build sample project
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strategy:
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matrix:
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system: [windows-latest, ubuntu-latest, macos-latest]
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fail-fast: false
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runs-on: ${{ matrix.system }}
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-node@v3
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with:
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node-version: current
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- name: Restore cache
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uses: actions/cache@v3
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id: restore-cache
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with:
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# The entire ~/.esy directory has to be cached because esy's
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# import/export commands don't import/export the Melange JS runtime
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# files
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path: ~/.esy
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key: ${{ matrix.system }}-esy-${{ hashFiles('esy.lock/index.json') }}
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restore-keys: |
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${{ matrix.system }}-esy-
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- name: npm install
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run: npm install
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# Separating the esy steps provides more fine-grained insight when
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# debugging failed jobs
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- name: esy install
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run: npx esy install
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- name: Build esy dependencies
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run: npx esy build-dependencies --release
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- name: Build project
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run: npx esy build --release
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- name: Bundle JS app
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run: npm run bundle

‎.github/workflows/update-esy-dependencies.yml

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on:
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schedule:
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- cron: "0 0 * * 0"
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workflow_dispatch:
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jobs:
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update-esy-dependencies:
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strategy:
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matrix:
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system: [ubuntu-latest]
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runs-on: ${{ matrix.system }}
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steps:
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- uses: actions/checkout@v3
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- uses: actions/setup-node@v3
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with:
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node-version: current
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- name: npm install
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run: npm install
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- name: Remove lockfile
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run: rm -rf esy.lock
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# Separating the esy steps provides more fine-grained insight when
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# debugging failed jobs
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- name: Update esy dependencies (esy install)
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run: npx esy install
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- name: Check if any dependencies were updated
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id: check-for-updates
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run: test -n "$(git status --porcelain)"
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continue-on-error: true
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- name: Build esy dependencies
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if: steps.check-for-updates.outcome == 'success'
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run: npx esy build-dependencies --release
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- name: Build project
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if: steps.check-for-updates.outcome == 'success'
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run: npx esy build --release
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- name: Bundle JS app
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if: steps.check-for-updates.outcome == 'success'
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run: npm run bundle
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- name: Create pull request to update dependencies
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if: steps.check-for-updates.outcome == 'success'
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uses: peter-evans/create-pull-request@v4
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with:
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commit-message: Update esy dependencies
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branch: update-esy-dependencies
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delete-branch: true
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title: Update esy dependencies
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- name: Cache dependencies
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if: steps.check-for-updates.outcome == 'success'
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uses: actions/cache@v3
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with:
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# The entire ~/.esy directory has to be cached because esy's
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# import/export commands don't import/export the Melange JS runtime
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# files
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path: ~/.esy
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key: ${{ matrix.system }}-esy-${{ hashFiles('esy.lock/index.json') }}

‎.gitignore

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.DS_Store
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node_modules
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_build
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_esy
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.merlin
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dist/

‎.vscode/settings.json

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{
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"ocaml.sandbox": {
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"kind": "custom",
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"template": "esy -P ${workspaceFolder:melange-esy-template} $prog $args --fallback-read-dot-merlin"
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}
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}

‎LICENSE

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MIT License
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Copyright (c) 2021 Javier Chávarri
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md

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# melange-esy-template
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A simple project template using [Melange](https://github.com/melange-re/melange)
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with [esy](https://esy.sh/).
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If you are looking for a template with opam, check [melange-opam-template](https://github.com/melange-re/melange-opam-template).
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## Quick Start
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```shell
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npm install
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# In separate terminals:
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npm run build:watch
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npm run serve
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```
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### React
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React support is provided by
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[`reason/react`](https://github.com/reasonml/reason-react/). The entry
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point of the sample React app is [`src/ReactApp.re`](src/ReactApp.re).
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## Commands
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- `npm install` - installs the npm/JavaScript dependencies, including the `esy`
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package manager (see below)
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- `npm run build:watch` - uses `esy` to:
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- Install OCaml-based dependencies (e.g. OCaml and Melange)
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- Symlink Melange's JavaScript runtime into `node_modules/melange`, so that
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JavaScript bundlers like Webpack can find the files when they're imported
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- Compile the project's ReasonML/OCaml/ReScript source files to JavaScript
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- Rebuild files when changed (via Melange's built-in watch mode)
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- `npm run serve` - starts a dev server to serve the frontend app
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## JavaScript output
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Since Melange just compiles source files into JavaScript files, it can be used
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for projects on any JavaScript platform - not just the browser.
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All ReasonML/OCaml/ReScript source files under `src/` will be compiled to
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JavaScript and written to `_build/default/src/*` (along with some other build
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artifacts).
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For example, [`src/Hello.ml`](src/Hello.ml) (using OCaml syntax) and
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[`src/Main.re`](src/Main.re) (using ReasonML syntax) can each be run with
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`node`:
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```bash
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node _build/default/src/node/src/Hello.js
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node _build/default/src/node/src/Main.js
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```

‎dune

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;; we start by ignoring node_modules. if you need to consume an OCaml
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;; project from `node_modules`, this should work:
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;; - remove the `dirs` stanza below
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;; - add a `(subdir node_modules (dirs only_your_package))`
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(dirs :standard \ node_modules)

‎dune-project

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(lang dune 3.8)
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(using directory-targets 0.1)
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(using melange 0.1)

‎esy.json

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{
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"name": "melange-project",
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"dependencies": {
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"ocaml": "4.14.0",
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"@opam/dune": ">= 3.8.0",
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"@opam/ocamlfind": "1.9.5",
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"@opam/ocamlbuild": "0.14.2",
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"@opam/reason": "*",
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"@opam/melange": ">=1.0.0",
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"@opam/reactjs-jsx-ppx": ">=1.0.0",
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"@opam/reason-react": "0.11.0"
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},
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"devDependencies": {
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"@opam/ocaml-lsp-server": ">= 1.12.0"
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},
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"esy": {
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"buildsInSource": "_build",
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"build": [
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"dune build @react @node"
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]
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},
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"scripts": {
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"build:watch": "dune build @react @node -w"
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},
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"installConfig": {
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"pnp": false
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}
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}

‎esy.lock/.gitattributes

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‎esy.lock/.gitignore

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