nuxt-route-meta/dist/parse-typescript.js

Adds Nuxt page data to route meta at build time. Also supports TypeScript.

import deepmerge from 'deepmerge';
import packageName from 'depcheck-package-name';
import { keys, omit } from 'lodash-es';
import predefinedProperties from "./predefined-properties.js";
export default (async script => {
  const ts = (await import('typescript')).default;
  const tsAstToLiteral = (await import(packageName`ts-ast-to-literal`)).default;
  const rootNode = ts.createSourceFile('x.ts', script.content, ts.ScriptTarget.Latest);
  let data = {};
  if (script.setup) {
    ts.forEachChild(rootNode, node => {
      switch (node.kind) {
        case ts.SyntaxKind.ExpressionStatement:
          {
            if (node.expression.kind === ts.SyntaxKind.CallExpression && node.expression.expression.escapedText === 'definePageMeta') {
              data = tsAstToLiteral(node.expression.arguments[0]);
            }
            break;
          }
        default:
      }
    });
  } else {
    ts.forEachChild(rootNode, node => {
      switch (node.kind) {
        case ts.SyntaxKind.ExportAssignment:
          {
            const object = node.expression.kind === ts.SyntaxKind.CallExpression && (node.expression.expression.kind === ts.SyntaxKind.PropertyAccessExpression && node.expression.expression.expression.escapedText === 'Vue' && node.expression.expression.name.escapedText === 'extend' && node.expression.arguments.length === 1 || node.expression.expression.kind === ts.SyntaxKind.Identifier && node.expression.expression.escapedText === 'defineComponent') ? node.expression.arguments[0] : node.expression;
            data = tsAstToLiteral(object);
            break;
          }
        case ts.SyntaxKind.ClassDeclaration:
          {
            if ((node.modifiers || []).some(modifier => modifier.kind === ts.SyntaxKind.ExportKeyword) && (node.modifiers || []).some(modifier => modifier.kind === ts.SyntaxKind.DefaultKeyword) && (node.heritageClauses || []).some(clause => clause.types.some(type => type.expression.escapedText === 'Vue'))) {
              data = Object.fromEntries(node.members.filter(member => member.initializer !== undefined).map(member => [member.name.escapedText, tsAstToLiteral(member.initializer)]));
            }
            break;
          }
        default:
      }
    });
    data = deepmerge(omit(data, ['meta', ...keys(predefinedProperties)]), data.meta || {});
  }
  return data;
});