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const i18nImports = new Set( [ '__', '_n', '_nx', '_x' ] );
module.exports = function ( babel ) {
const { types: t } = babel;
// Collects named imports from the "@wordpress/i18n" package
function collectAllImportsAndAliasThem( path ) {
const node = path.node;
const aliases = [];
if ( t.isStringLiteral( node.source ) && node.source.value === '@wordpress/i18n' ) {
const specifiers = path.get( 'specifiers' );
for ( const specifier of specifiers ) {
if ( t.isImportSpecifier( specifier ) ) {
const importedNode = specifier.node.imported;
const localNode = specifier.node.local;
if ( t.isIdentifier( importedNode ) && t.isIdentifier( localNode ) ) {
if ( i18nImports.has( importedNode.name ) ) {
aliases.push( {
original: localNode.name,
aliased: 'alias' + localNode.name,
} );
specifier.replaceWith(
t.importSpecifier(
t.identifier( 'alias' + localNode.name ),
t.identifier( importedNode.name )
)
);
path.scope.removeBinding( localNode.name );
}
}
}
}
path.scope.registerDeclaration( path );
}
return aliases;
}
return {
name: 'babel-plugin-preserve-i18n',
visitor: {
ImportDeclaration( path ) {
const aliases = collectAllImportsAndAliasThem( path );
if ( aliases.length > 0 ) {
const declarations = aliases.map( ( { original, aliased } ) =>
t.variableDeclarator( t.identifier( original ), t.identifier( aliased ) )
);
const aliasDeclarationNode = t.variableDeclaration( 'const', declarations );
path.insertAfter( aliasDeclarationNode );
const aliasDeclarationPath = path.getNextSibling();
path.scope.registerDeclaration( aliasDeclarationPath );
}
},
},
};
};
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