babel-plugin-transform-modern-regexp

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0.0.6 verified Fri May 01 auth: no javascript deprecated

Babel plugin that transpiles modern RegExp features (dotAll s-flag, named capturing groups, extended x-flag) down to ES5-compatible JavaScript. Current stable version is 0.0.6, last updated in 2019. This plugin has low maintenance cadence and is based on the regexp-tree library. It is a non-standard package, not affiliated with Babel core, and mostly useful for projects that need to support older JavaScript engines without native support for these features.

Common errors

error Error: Plugin transform-modern-regexp: Unknown plugin "transform-modern-regexp" ↓
cause Babel >=7 does not find the plugin in node_modules or it's not installed.
fix
Install the plugin: npm install babel-plugin-transform-modern-regexp --save-dev
error TypeError: Cannot read property 'features' of undefined ↓
cause Plugin options are malformed; missing plugin object.
fix
Use correct format in .babelrc: ["transform-modern-regexp", { "features": [...] }]
error Error: Cannot find module 'regexp-tree' ↓
cause regexp-tree is a peer dependency of the plugin but not automatically installed.
fix
Run: npm install regexp-tree --save-dev

Warnings

deprecated Package is unmaintained since 2019 and does not support modern Babel versions (7.x+). ↓
fix Use native RegExp features or a more actively maintained plugin like @babel/plugin-proposal-unicode-property-regex.
gotcha Requires regexp-tree package as a direct dependency but is not included in the plugin's package.json dependencies list (it's a peer dependency). ↓
fix Manually install regexp-tree: npm install regexp-tree --save-dev.
gotcha The xFlag feature transforms extended regexes but only works with new RegExp() calls, not regex literals. ↓
fix Use new RegExp(pattern, 'x') syntax for extended flag.
gotcha Plugin options are passed as an array item, not as a separate object in .babelrc plugins array. ↓
fix Use ["transform-modern-regexp", { ... }] structure.

Install

npm install babel-plugin-transform-modern-regexp
yarn add babel-plugin-transform-modern-regexp
pnpm add babel-plugin-transform-modern-regexp

Imports