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Fixed missing React import for React 17 apps after eject #17124

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Fixed missing React import for React 17 apps after eject #17124

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53 changes: 35 additions & 18 deletions packages/react-scripts/scripts/eject.js
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ function tryGitAdd(appPath) {
console.log(
chalk.cyan.bold(
'NOTE: Create React App 2+ supports TypeScript, Sass, CSS Modules and more without ejecting: ' +
'https://reactjs.org/blog/2018/10/01/create-react-app-v2.html'
'https://reactjs.org/blog/2018/10/01/create-react-app-v2.html'
)
);
console.log();
Expand All @@ -79,15 +79,15 @@ prompts({
chalk.red(
'This git repository has untracked files or uncommitted changes:'
) +
'\n\n' +
gitStatus
.split('\n')
.map(line => line.match(/ .*/g)[0].trim())
.join('\n') +
'\n\n' +
chalk.red(
'Remove untracked files, stash or commit any changes, and try again.'
)
'\n\n' +
gitStatus
.split('\n')
.map(line => line.match(/ .*/g)[0].trim())
.join('\n') +
'\n\n' +
chalk.red(
'Remove untracked files, stash or commit any changes, and try again.'
)
);
process.exit(1);
}
Expand All @@ -101,9 +101,9 @@ prompts({
if (fs.existsSync(path.join(appPath, file))) {
console.error(
`\`${file}\` already exists in your app folder. We cannot ` +
'continue as you would lose all the changes in that file or directory. ' +
'Please move or delete it (maybe make a copy for backup) and run this ' +
'command again.'
'continue as you would lose all the changes in that file or directory. ' +
'Please move or delete it (maybe make a copy for backup) and run this ' +
'command again.'
);
process.exit(1);
}
Expand Down Expand Up @@ -146,33 +146,50 @@ prompts({
fs.mkdirSync(path.join(appPath, folder), { recursive: true });
});

const ownPackage = require(path.join(ownPath, 'package.json'));
const appPackage = require(path.join(appPath, 'package.json'));

const reactVersion =
appPackage.dependencies.react || appPackage.devDependencies?.react || '0.0.0';

const isReact17 = reactVersion.startsWith('17.');

files.forEach(file => {
let content = fs.readFileSync(file, 'utf8');

// Skip flagged files
if (content.match(/\/\/ @remove-file-on-eject/)) {
return;
}

content =
content
// Remove dead code from .js files on eject
// Remove dead code
.replace(
/\/\/ @remove-on-eject-begin([\s\S]*?)\/\/ @remove-on-eject-end/gm,
''
)
// Remove dead code from .applescript files on eject
.replace(
/-- @remove-on-eject-begin([\s\S]*?)-- @remove-on-eject-end/gm,
''
)
.trim() + '\n';

// ✅ Inject import React for React 17 if JSX is used
if (
isReact17 &&
file.endsWith('.js') &&
content.includes('<') && // crude JSX check
!content.includes("import React from 'react'")
) {
content = `import React from 'react';\n` + content;
}

console.log(` Adding ${cyan(file.replace(ownPath, ''))} to the project`);
fs.writeFileSync(file.replace(ownPath, appPath), content);
});
console.log();

const ownPackage = require(path.join(ownPath, 'package.json'));
const appPackage = require(path.join(appPath, 'package.json'));
console.log();

console.log(cyan('Updating the dependencies'));
const ownPackageName = ownPackage.name;
Expand Down