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Dima Portenko
Dima Portenko

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Prepare Expo project with bash script to setup TypeScript ESLint Prettier

In this post I shared my step by step way to setup new expo project generally required to any project I would like to create. But after passed this instructions several times I found it very annoying and wasting my time. So I decided to write a script which will do all steps in one go.

Let's create directory and script file

mkdir -p automation/bin
cd automation/bin
touch quickstart
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So quickstart will be our executable, continue with write our script in this file.

#!/usr/bin/env bash
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This basically means that executable will be run by bash.

I would like to run command with project name as param

quickstart your-project-name-param
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And I like to exit script if project name wasn't provided.

if [ -n "$1" ]; then
  echo $1
else
  echo "Error! Please enter project name!" 1>&2
  exit 1
fi
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$1 is first script param. And now we can create expo project with typescript template

expo init -t expo-template-blank-typescript $1
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Then move to the project directory and install dependencies

DIR="$(pwd)"
cd "$DIR/$1"

yarn add -D eslint prettier @react-native-community/eslint-config @typescript-eslint/eslint-plugin eslint-config-prettier
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Create and fill .eslintrc.js

cat > .eslintrc.js <<EOF
module.exports = {
  extends: ['@react-native-community', "eslint-config-prettier"],
}
EOF
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Update json files is easier to do inside the nodejs script automation/patch-json.js.

const fs = require('fs');

const args = process.argv.slice(2);
const getFilepath = (filename) => `${args[0]}/${filename}`
// console.log(args)

let fileName = getFilepath('tsconfig.json');
let file = require(fileName);

file.compilerOptions.module = "es6";

fs.writeFile(fileName, JSON.stringify(file), function writeJSON(err) {
  if (err) return console.log(err);
  console.log(JSON.stringify(file));
  console.log('writing to ' + fileName);
});

fileName = getFilepath('package.json');
file = require(fileName);

if (file.resolutions) {
  file.resolutions["@types/react"] = "^17"
} else {
  file.resolutions = {
    "@types/react": "^17"
  }
}

fs.writeFile(fileName, JSON.stringify(file), function writeJSON(err) {
  if (err) return console.log(err);
  console.log(JSON.stringify(file));
  console.log('writing to ' + fileName);
});
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And we can run this node script like this

SCRIPTS_DIR="$(dirname -- "${BASH_SOURCE[0]}")/.."
node "$SCRIPTS_DIR/patch-json.js" "$DIR/$1"
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SCRIPTS_DIR - directory where our patch-json.js script located. "$DIR/$1" - path of our newly created project.

Since I'm using WebStorm I would like to update .gitignore

echo ".idea" >> ".gitignore"
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Apply all my rules with prettier

./node_modules/prettier/bin-prettier.js --write .
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And commit changes to the git

git add .
git commit -m 'expostart script updates'
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And the final step - to be able run the command from any directory I need to add my bin directory to the terminal PATH varilble. I'm using zsh so I'll put following to the ~/.zshrc

export PATH=$PATH:$HOME/scripts/expo/bin
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Don't forget to source config before use

source ~/.zshrc
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Now you can create new project with following command

quickstart your-project-name
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You can find full script in the repository.

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