# @babel/eslint-plugin-development-internal The Babel team's custom ESLint rules for the babel/babel monorepo. ## Installation ```sh $ npm install --save-dev @babel/eslint-plugin-development-internal ``` or ```sh $ yarn add --save-dev @babel/eslint-plugin-development-internal ``` ## Usage The plugin can be loaded in your `.eslintrc.*` configuration file as follows: (note that you can omit the `eslint-plugin-` prefix): ```json { "plugins": ["@babel/development-internal"] } ``` ## Rules ### `@babel/development-internal/report-error-message-format` This rule is inspired by https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/blob/master/docs/rules/report-message-format.md. Intended for use in `packages/babel-parser/src/**/*`. When enabled, this rule warns for inconsistently error messages format in arguments of `makeErrorTemplates` function calls. Basically, it starts with an uppercase Latin letter(A~Z) and ends with a period(.) or a question(?). But it can start with `'keyword'` or `` `code` `` to include JavaScript keywords or code in error messages. valid: ```js makeErrorTemplates({ ThisIsAnError: "This is an error." }); makeErrorTemplates({ ThisIsAnError: "'this' is an error." }); makeErrorTemplates({ ThisIsAnError: "`this` is an error." }); makeErrorTemplates({ ThisIsAnError: "This is an error?" }); makeErrorTemplates({ ThisIsAnError: "'this' is an error?" }); makeErrorTemplates({ ThisIsAnError: "`this` is an error?" }); ``` invalid: ```js makeErrorTemplates({ ThisIsAnError: 'this is an error.' }); makeErrorTemplates({ ThisIsAnError: 'This is an error' }); makeErrorTemplates({ ThisIsAnError: 'this is an error?' }); makeErrorTemplates({ ThisIsAnError: '`this` is an error' }); makeErrorTemplates({ ThisIsAnError: "'this' is an error" }); ``` Example configuration: ```js { rules: { "@babel/development-internal/report-error-message-format": "error" } } ```
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