Babel parser example

node v16.17.1
version: master
endpointsharetweet
// Source code example for fwouts.com/articles/previewjs-detecting-components const babelParser = require("@babel/parser"); const code = ` const Foo = () => { return <div>{greeting}</div>; }; const greeting = "Hello, World!"; export const Bar = Foo; export const Baz = () => 123; `; const ast = babelParser.parse(code, { sourceType: "module", plugins: ["jsx"] }); const detectedComponents = []; for (const statement of ast.program.body) { if (statement.type === "VariableDeclaration") { const componentName = getDeclaredComponentName(statement); if (componentName) { detectedComponents.push(componentName); } } else if (statement.type === "ExportNamedDeclaration") { const componentName = getDeclaredComponentName(statement.declaration); if (componentName) { detectedComponents.push(componentName); } } } function getDeclaredComponentName(declaration) { for (const declarator of declaration.declarations) { if (declarator.id.type === "Identifier" && declarator.init && declarator.init.type === "ArrowFunctionExpression") { if (containsJsxElement(declarator.init.body)) { return declarator.id.name; } } } return null; } function containsJsxElement(node) { if (node.type === "JSXElement") { return true; } for (const child of Object.values(node)) { if (Array.isArray(child)) { for (const item of child) { if (item.constructor.name !== "Node") { continue; } if (containsJsxElement(child)) { return true; } } } else if (child.constructor.name !== "Node") { continue; } if (containsJsxElement(child)) { return true; } } return false; } console.log(detectedComponents);
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