First pass at I18N-specific ESLint rules

.eslintrc.js

@@ -42,6 +42,13 @@ module.exports = {
 		'@wordpress/dependency-group': 'error',
 		'@wordpress/gutenberg-phase': 'error',
 		'@wordpress/react-no-unsafe-timeout': 'error',
+		'@wordpress/i18n-text-domain': [
+			'error',
+			{
+				allowedTextDomain: 'default',
+			},
+		],
+		'@wordpress/i18n-no-collapsible-whitespace': 'off',
 		'no-restricted-syntax': [
 			'error',
 			// NOTE: We can't include the forward slash in our regex or
@@ -67,29 +74,6 @@ module.exports = {
 				message:
 					'Deprecated functions must be removed before releasing this version.',
 			},
-			{
-				selector:
-					'CallExpression[callee.name=/^(__|_n|_nx|_x)$/]:not([arguments.0.type=/^Literal|BinaryExpression$/])',
-				message:
-					'Translate function arguments must be string literals.',
-			},
-			{
-				selector:
-					'CallExpression[callee.name=/^(_n|_nx|_x)$/]:not([arguments.1.type=/^Literal|BinaryExpression$/])',
-				message:
-					'Translate function arguments must be string literals.',
-			},
-			{
-				selector:
-					'CallExpression[callee.name=_nx]:not([arguments.3.type=/^Literal|BinaryExpression$/])',
-				message:
-					'Translate function arguments must be string literals.',
-			},
-			{
-				selector:
-					'CallExpression[callee.name=/^(__|_x|_n|_nx)$/] Literal[value=/\\.{3}/]',
-				message: 'Use ellipsis character (…) in place of three dots',
-			},
 			{
 				selector:
 					'ImportDeclaration[source.value="redux"] Identifier.imported[name="combineReducers"]',

packages/block-directory/src/components/block-ratings/index.js

@@ -13,13 +13,11 @@ export const BlockRatings = ( { rating, ratingCount } ) => (
 		<Stars rating={ rating } />
 		<span
 			className="block-directory-block-ratings__rating-count"
-			aria-label={
+			aria-label={ sprintf(
 				// translators: %d: number of ratings (number).
-				sprintf(
-					_n( '%d total rating', '%d total ratings', ratingCount ),
-					ratingCount
-				)
-			}
+				_n( '%d total rating', '%d total ratings', ratingCount ),
+				ratingCount
+			) }
 		>
 			({ ratingCount })
 		</span>

packages/block-directory/src/components/block-ratings/stars.js

@@ -17,7 +17,13 @@ function Stars( { rating } ) {
 	const emptyStarCount = 5 - ( fullStarCount + halfStarCount );
 
 	return (
-		<div aria-label={ sprintf( __( '%s out of 5 stars' ), stars ) }>
+		<div
+			aria-label={ sprintf(
+				/* translators: %s: number of stars. */
+				__( '%s out of 5 stars' ),
+				stars
+			) }
+		>
 			{ times( fullStarCount, ( i ) => (
 				<Icon
 					key={ `full_stars_${ i }` }

packages/block-directory/src/components/downloadable-block-author-info/index.js

@@ -12,13 +12,18 @@ function DownloadableBlockAuthorInfo( {
 	return (
 		<Fragment>
 			<span className="block-directory-downloadable-block-author-info__content-author">
-				{ sprintf( __( 'Authored by %s' ), author ) }
+				{ sprintf(
+					/* translators: %s: author name. */
+					__( 'Authored by %s' ),
+					author
+				) }
 			</span>
 			<span className="block-directory-downloadable-block-author-info__content">
 				{ sprintf(
+					/* translators: 1: number of blocks. 2: average rating. */
 					_n(
-						'This author has %d block, with an average rating of %d.',
-						'This author has %d blocks, with an average rating of %d.',
+						'This author has %1$d block, with an average rating of %2$d.',
+						'This author has %1$d blocks, with an average rating of %2$d.',
 						authorBlockCount
 					),
 					authorBlockCount,

packages/block-directory/src/components/downloadable-block-header/index.js

@@ -20,10 +20,13 @@ function DownloadableBlockHeader( {
 	return (
 		<div className="block-directory-downloadable-block-header__row">
 			{ icon.match( /\.(jpeg|jpg|gif|png)(?:\?.*)?$/ ) !== null ? (
-				// translators: %s: Name of the plugin e.g: "Akismet".
 				<img
 					src={ icon }
-					alt={ sprintf( __( '%s block icon' ), title ) }
+					alt={ sprintf(
+						// translators: %s: Name of the plugin e.g: "Akismet".
+						__( '%s block icon' ),
+						title
+					) }
 				/>
 			) : (
 				<span>

packages/block-directory/src/components/downloadable-block-info/index.js

@@ -19,6 +19,7 @@ function DownloadableBlockInfo( {
 				<div className="block-directory-downloadable-block-info__column">
 					<Icon icon={ chartLine }></Icon>
 					{ sprintf(
+						/* translators: %s: number of active installations. */
 						_n(
 							'%d active installation',
 							'%d active installations',

packages/block-directory/src/components/downloadable-blocks-panel/index.js

@@ -55,6 +55,7 @@ function DownloadableBlocksPanel( {
 	}
 
 	const resultsFoundMessage = sprintf(
+		/* translators: %s: number of available blocks. */
 		_n(
 			'No blocks found in your library. We did find %d block available for download.',
 			'No blocks found in your library. We did find %d blocks available for download.',

packages/block-editor/src/components/block-mover/mover-description.js

@@ -58,8 +58,8 @@ export function getBlockMoverDescription(
 	}
 
 	if ( isFirst && isLast ) {
-		// translators: %s: Type of block (i.e. Text, Image etc)
 		return sprintf(
+			// translators: %s: Type of block (i.e. Text, Image etc)
 			__( 'Block %s is the only block, and cannot be moved' ),
 			type
 		);

packages/block-editor/src/components/block-switcher/index.js

@@ -114,6 +114,7 @@ export class BlockSwitcher extends Component {
 						1 === blocks.length
 							? __( 'Change block type or style' )
 							: sprintf(
+									/* translators: %s: number of blocks. */
 									_n(
 										'Change type of %d block',
 										'Change type of %d blocks',

packages/block-editor/src/components/button-block-appender/index.js

@@ -33,8 +33,8 @@ function ButtonBlockAppender( {
 			} ) => {
 				let label;
 				if ( hasSingleBlockType ) {
-					// translators: %s: the name of the block when there is only one
 					label = sprintf(
+						// translators: %s: the name of the block when there is only one
 						_x( 'Add %s', 'directly add the only allowed block' ),
 						blockTitle
 					);

packages/block-editor/src/components/inserter/block-list.js

@@ -315,6 +315,7 @@ function InserterBlockList( {
 		);
 
 		const resultsFoundMessage = sprintf(
+			/* translators: %d: number of results. */
 			_n( '%d result found.', '%d results found.', resultCount ),
 			resultCount
 		);

packages/block-editor/src/components/inserter/index.js

@@ -29,8 +29,8 @@ const defaultRenderToggle = ( {
 } ) => {
 	let label;
 	if ( hasSingleBlockType ) {
-		// translators: %s: the name of the block when there is only one
 		label = sprintf(
+			// translators: %s: the name of the block when there is only one
 			_x( 'Add %s', 'directly add the only allowed block' ),
 			blockTitle
 		);
@@ -236,8 +236,8 @@ export default compose( [
 				);
 
 				if ( ! selectBlockOnInsert ) {
-					// translators: %s: the name of the block that has been added
 					const message = sprintf(
+						// translators: %s: the name of the block that has been added
 						__( '%s block added' ),
 						allowedBlockType.title
 					);

packages/block-editor/src/components/link-control/index.js

@@ -444,7 +444,11 @@ function LinkControl( {
 		const searchResultsLabelId = `block-editor-link-control-search-results-label-${ instanceId }`;
 		const labelText = isInitialSuggestions
 			? __( 'Recently updated' )
-			: sprintf( __( 'Search results for "%s"' ), inputValue );
+			: sprintf(
+					/* translators: %s: search term. */
+					__( 'Search results for "%s"' ),
+					inputValue
+			  );
 
 		// VisuallyHidden rightly doesn't accept custom classNames
 		// so we conditionally render it as a wrapper to visually hide the label

packages/block-editor/src/components/link-control/search-create-button.js

@@ -40,6 +40,7 @@ export const LinkControlSearchCreate = ( {
 				<span className="block-editor-link-control__search-item-title">
 					{ createInterpolateElement(
 						sprintf(
+							/* translators: %s: search term. */
 							__( 'New page: <mark>%s</mark>' ),
 							searchTerm
 						),

packages/block-editor/src/components/multi-selection-inspector/index.js

@@ -27,15 +27,18 @@ function MultiSelectionInspector( { blocks } ) {
 			/>
 			<div className="block-editor-multi-selection-inspector__card-content">
 				<div className="block-editor-multi-selection-inspector__card-title">
-					{ /* translators: %d: number of blocks */
-					sprintf(
+					{ sprintf(
+						/* translators: %d: number of blocks */
 						_n( '%d block', '%d blocks', blocks.length ),
 						blocks.length
 					) }
 				</div>
 				<div className="block-editor-multi-selection-inspector__card-description">
-					{ /* translators: %d: number of words */
-					sprintf( _n( '%d word', '%d words', words ), words ) }
+					{ sprintf(
+						/* translators: %d: number of words */
+						_n( '%d word', '%d words', words ),
+						words
+					) }
 				</div>
 			</div>
 		</div>

packages/block-editor/src/components/responsive-block-control/index.js

@@ -26,9 +26,8 @@ function ResponsiveBlockControl( props ) {
 		isResponsive = false,
 		defaultLabel = {
 			id: 'all',
-			label: __(
-				'All'
-			) /* translators: 'Label. Used to signify a layout property (eg: margin, padding) will apply uniformly to all screensizes.' */,
+			/* translators: 'Label. Used to signify a layout property (eg: margin, padding) will apply uniformly to all screensizes.' */
+			label: __( 'All' ),
 		},
 		viewports = [
 			{
@@ -50,10 +49,13 @@ function ResponsiveBlockControl( props ) {
 		return null;
 	}
 
-	/* translators: 'Toggle control label. Should the property be the same across all screen sizes or unique per screen size.'. %s property value for the control (eg: margin, padding...etc) */
 	const toggleControlLabel =
 		toggleLabel ||
-		sprintf( __( 'Use the same %s on all screensizes.' ), property );
+		sprintf(
+			/* translators: 'Toggle control label. Should the property be the same across all screen sizes or unique per screen size.'. %s property value for the control (eg: margin, padding...etc) */
+			__( 'Use the same %s on all screensizes.' ),
+			property
+		);
 
 	/* translators: 'Help text for the responsive mode toggle control.' */
 	const toggleHelpText = __(

packages/block-editor/src/components/responsive-block-control/label.js

@@ -15,6 +15,7 @@ export default function ResponsiveBlockControlLabel( {
 	const accessibleLabel =
 		desc ||
 		sprintf(
+			/* translators: 1: property name. 2: viewport name. */
 			_x(
 				'Controls the %1$s property for %2$s viewports.',
 				'Text labelling a interface as controlling a given layout property (eg: margin) for a given screen size.'

packages/block-editor/src/components/url-input/index.js

@@ -178,6 +178,7 @@ class URLInput extends Component {
 				if ( !! suggestions.length ) {
 					this.props.debouncedSpeak(
 						sprintf(
+							/* translators: %s: number of results. */
 							_n(
 								'%d result found, use up and down arrow keys to navigate.',
 								'%d results found, use up and down arrow keys to navigate.',

packages/block-editor/src/store/effects.js

@@ -223,9 +223,9 @@ export default {
 	MULTI_SELECT: ( action, { getState } ) => {
 		const blockCount = getSelectedBlockCount( getState() );
 
-		/* translators: %s: number of selected blocks */
 		speak(
 			sprintf(
+				/* translators: %s: number of selected blocks */
 				_n( '%s block selected.', '%s blocks selected.', blockCount ),
 				blockCount
 			),

packages/block-library/src/embed/embed-preview.js

@@ -73,8 +73,8 @@ class EmbedPreview extends Component {
 			.splice( parsedHost.length - 2, parsedHost.length - 1 )
 			.join( '.' );
 		const cannotPreview = includes( HOSTS_NO_PREVIEWS, parsedHostBaseUrl );
-		// translators: %s: host providing embed content e.g: www.youtube.com
 		const iframeTitle = sprintf(
+			// translators: %s: host providing embed content e.g: www.youtube.com
 			__( 'Embedded content from %s' ),
 			parsedHostBaseUrl
 		);
@@ -125,8 +125,8 @@ class EmbedPreview extends Component {
 							<a href={ url }>{ url }</a>
 						</p>
 						<p className="components-placeholder__error">
-							{ /* translators: %s: host providing embed content e.g: www.youtube.com */
-							sprintf(
+							{ sprintf(
+								/* translators: %s: host providing embed content e.g: www.youtube.com */
 								__(
 									"Embedded content from %s can't be previewed in the editor."
 								),

packages/block-library/src/gallery/gallery.js

@@ -51,8 +51,8 @@ export const Gallery = ( props ) => {
 		>
 			<ul className="blocks-gallery-grid">
 				{ images.map( ( img, index ) => {
-					/* translators: %1$d is the order number of the image, %2$d is the total number of images. */
 					const ariaLabel = sprintf(
+						/* translators: 1: the order number of the image. 2: the total number of images. */
 						__( 'image %1$d of %2$d in gallery' ),
 						index + 1,
 						images.length

packages/block-library/src/gallery/gallery.native.js

@@ -88,8 +88,8 @@ export const Gallery = ( props ) => {
 				}
 			>
 				{ images.map( ( img, index ) => {
-					/* translators: %1$d is the order number of the image, %2$d is the total number of images. */
 					const ariaLabel = sprintf(
+						/* translators: 1: the order number of the image. 2: the total number of images. */
 						__( 'image %1$d of %2$d in gallery' ),
 						index + 1,
 						images.length

packages/block-library/src/image/edit.js

@@ -541,6 +541,7 @@ export class ImageEdit extends Component {
 									defaultedAlt = alt;
 								} else if ( filename ) {
 									defaultedAlt = sprintf(
+										/* translators: %s: file name */
 										__(
 											'This image has an empty alt attribute; its file name is %s'
 										),

packages/block-library/src/missing/edit.js

@@ -17,6 +17,7 @@ function MissingBlockWarning( { attributes, convertToHTML } ) {
 	let messageHTML;
 	if ( hasContent && hasHTMLBlock ) {
 		messageHTML = sprintf(
+			/* translators: %s: block name */
 			__(
 				'Your site doesn’t include support for the "%s" block. You can leave this block intact, convert its content to a Custom HTML block, or remove it entirely.'
 			),
@@ -29,6 +30,7 @@ function MissingBlockWarning( { attributes, convertToHTML } ) {
 		);
 	} else {
 		messageHTML = sprintf(
+			/* translators: %s: block name */
 			__(
 				'Your site doesn’t include support for the "%s" block. You can leave this block intact or remove it entirely.'
 			),

packages/block-library/src/missing/edit.native.js

@@ -75,11 +75,12 @@ export class UnsupportedBlockEdit extends Component {
 			styles.infoSheetIconDark
 		);
 
-		// translators: %s: Name of the block
 		const titleFormat =
 			Platform.OS === 'android'
-				? __( "'%s' isn't yet supported on WordPress for Android" )
-				: __( "'%s' isn't yet supported on WordPress for iOS" );
+				? // translators: %s: Name of the block
+				  __( "'%s' isn't yet supported on WordPress for Android" )
+				: // translators: %s: Name of the block
+				  __( "'%s' isn't yet supported on WordPress for iOS" );
 		const infoTitle = sprintf( titleFormat, title );
 
 		return (

packages/block-library/src/post-author/edit.js

@@ -13,7 +13,13 @@ function PostAuthorDisplay() {
 		[ authorId ]
 	);
 	return author ? (
-		<address>{ sprintf( __( 'By %s' ), author.name ) }</address>
+		<address>
+			{ sprintf(
+				/* translators: %s: author name. */
+				__( 'By %s' ),
+				author.name
+			) }
+		</address>
 	) : null;
 }