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Add babel plugin to optimize web output
The babel plugin can be used by web builds to inline the component wrapper and remove the runtime overhead. Fix #23
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
| const { addNamed, addNamespace } = require('@babel/helper-module-imports'); | ||
|
|
||
| module.exports = function ({ types: t }) { | ||
| const packageName = 'react-strict-dom'; | ||
| const packageRuntime = 'react-strict-dom/dist/runtime'; | ||
| const findImportDeclaration = (body, sourceValue) => | ||
| body.filter( | ||
| (node) => | ||
| node.type === 'ImportDeclaration' && node.source.value === sourceValue | ||
| ); | ||
| const findHtmlSpecifier = (specifiers) => | ||
| specifiers | ||
| ? specifiers.filter((specifier) => specifier.imported.name === 'html') | ||
| : []; | ||
| let defaultStylesImportIdentifier; | ||
| let stylexImportIdentifier; | ||
|
|
||
| return { | ||
| visitor: { | ||
| Program: { | ||
| enter(path) { | ||
| const importDeclarations = findImportDeclaration( | ||
| path.node.body, | ||
| packageName | ||
| ); | ||
| if (importDeclarations.length > 0) { | ||
| defaultStylesImportIdentifier = addNamed( | ||
| path, | ||
| 'defaultStyles', | ||
| packageRuntime | ||
| ); | ||
| stylexImportIdentifier = addNamespace(path, '@stylexjs/stylex', { | ||
| nameHint: 'stylex' | ||
| }); | ||
| path.scope.rename( | ||
| 'defaultStyles', | ||
| defaultStylesImportIdentifier.name | ||
| ); | ||
| path.scope.rename('stylex', stylexImportIdentifier.name); | ||
| } | ||
| } | ||
| }, | ||
| JSXMemberExpression(path, state) { | ||
| const importDeclarations = findImportDeclaration( | ||
| state.file.ast.program.body, | ||
| packageName | ||
| ); | ||
| if (!importDeclarations) return; | ||
| const htmlSpecifiers = importDeclarations.flatMap((declaration) => | ||
| findHtmlSpecifier(declaration.specifiers) | ||
| ); | ||
| if ( | ||
| htmlSpecifiers.some( | ||
| (specifier) => path.node.object.name === specifier.local.name | ||
| ) | ||
| ) { | ||
| path.replaceWith(t.jsxIdentifier(path.node.property.name)); | ||
| } | ||
| }, | ||
| JSXOpeningElement(path, state) { | ||
| const importDeclarations = findImportDeclaration( | ||
| state.file.ast.program.body, | ||
| packageName | ||
| ); | ||
| if (!importDeclarations) return; | ||
| const htmlSpecifiers = importDeclarations.flatMap((declaration) => | ||
| findHtmlSpecifier(declaration.specifiers) | ||
| ); | ||
| if ( | ||
| htmlSpecifiers.some( | ||
| (specifier) => | ||
| t.isJSXMemberExpression(path.node.name) && | ||
| path.node.name.object.name === specifier.local.name | ||
| ) | ||
| ) { | ||
| let styleAttributeExists = false; | ||
| let typeAttributeExists = false; | ||
| let dirAttributeExists = false; | ||
|
|
||
| path.node.attributes.forEach((attribute, index) => { | ||
| if (t.isJSXAttribute(attribute) && attribute.name.name === 'for') { | ||
| attribute.name.name = 'htmlFor'; | ||
| } | ||
| if ( | ||
| t.isJSXAttribute(attribute) && | ||
| attribute.name.name === 'role' && | ||
| attribute.value.value === 'none' | ||
| ) { | ||
| attribute.value.value = 'presentation'; | ||
| } | ||
| if ( | ||
| t.isJSXAttribute(attribute) && | ||
| attribute.name.name === 'style' | ||
| ) { | ||
| styleAttributeExists = true; | ||
| const styleValue = attribute.value.expression; | ||
| const elementName = path.node.name.property.name; | ||
| const defaultStyles = t.memberExpression( | ||
| t.identifier(defaultStylesImportIdentifier.name), | ||
| t.identifier(elementName) | ||
| ); | ||
| path.node.attributes[index] = t.jsxSpreadAttribute( | ||
| t.callExpression( | ||
| t.memberExpression( | ||
| t.identifier(stylexImportIdentifier.name), | ||
| t.identifier('props') | ||
| ), | ||
| [defaultStyles].concat( | ||
| Array.isArray(styleValue.elements) | ||
| ? styleValue.elements | ||
| : [styleValue] | ||
| ) | ||
| ) | ||
| ); | ||
| } | ||
| if (t.isJSXAttribute(attribute) && attribute.name.name === 'type') { | ||
| typeAttributeExists = true; | ||
| } | ||
| if (t.isJSXAttribute(attribute) && attribute.name.name === 'dir') { | ||
| dirAttributeExists = true; | ||
| } | ||
| }); | ||
|
|
||
| const elementName = path.node.name.property.name; | ||
| if (elementName === 'button' && !typeAttributeExists) { | ||
| path.node.attributes.push( | ||
| t.jsxAttribute(t.jsxIdentifier('type'), t.stringLiteral('button')) | ||
| ); | ||
| } | ||
|
|
||
| if ( | ||
| (elementName === 'input' || elementName === 'textarea') && | ||
| !dirAttributeExists | ||
| ) { | ||
| path.node.attributes.push( | ||
| t.jsxAttribute(t.jsxIdentifier('dir'), t.stringLiteral('auto')) | ||
| ); | ||
| } | ||
|
|
||
| if (!styleAttributeExists) { | ||
| const elementName = path.node.name.property.name; | ||
| const defaultStyles = t.memberExpression( | ||
| t.identifier(defaultStylesImportIdentifier.name), | ||
| t.identifier(elementName) | ||
| ); | ||
| path.node.attributes.push( | ||
| t.jsxSpreadAttribute( | ||
| t.callExpression( | ||
| t.memberExpression( | ||
| t.identifier(stylexImportIdentifier.name), | ||
| t.identifier('props') | ||
| ), | ||
| [defaultStyles] | ||
| ) | ||
| ) | ||
| ); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| }; | ||
| }; |
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