investigate ts-morth integration

[lifeart]

const ts = require('ts-morph');

const Project = ts.Project;
const Node = ts.Node;

function getHelper(filePath) {

  const project = new Project({ compilerOptions: { allowJs: true } });

  const helperFile = project.addSourceFileAtPath(filePath);

  const defaultExportSymbol = helperFile.getDefaultExportSymbol();

  if (defaultExportSymbol) {
    const declaration = defaultExportSymbol.getDeclarations()[0];
    if (declaration && Node.isExportAssignment(declaration)) {
      let helperWrapper = declaration.getExpression();
      let helper;
      let helperWrapperDefinition;
      if (Node.isIdentifier(helperWrapper)) {
        helperWrapperDefinition = helperWrapper.getDefinitionNodes()[0];
        helperWrapper = helperWrapperDefinition.getChildren().slice(-1)[0];
      }

      helper = helperWrapper.getArguments()[0];
      if (Node.isIdentifier(helper)) {
        helper = helper.getDefinitionNodes()[0];
      }

      if (helper.isExported && helper.isExported()) {
        helper.setIsExported(false);
      }

      const txt = helper.getFullText();
      helper.remove();
      helperWrapperDefinition?.remove();
      declaration.remove();

      return `${helperFile.getFullText()} export default ${txt}`;
    }
  }
  return null;
}

const h = getHelper('./app/helpers/custom.js');
console.log(h);

const ts = require('ts-morph');

const Project = ts.Project;
const Node = ts.Node;

function getModifier(filePath) {

  const project = new Project({ compilerOptions: { allowJs: true } });

  const modifierFile = project.addSourceFileAtPath(filePath);

  const defaultExportSymbol = modifierFile.getDefaultExportSymbol();

  if (defaultExportSymbol) {
    const declaration = defaultExportSymbol.getDeclarations()[0];
    if (declaration && Node.isExportAssignment(declaration)) {
      let modifierWrapper = declaration.getExpression();
      let modifierWrapperDefinition;
      if (Node.isIdentifier(modifierWrapper)) {
        modifierWrapperDefinition = modifierWrapper.getDefinitionNodes()[0];
        modifierWrapper = modifierWrapperDefinition.getChildren().slice(-1)[0];
      }

      const functions = modifierWrapper.getDescendantsOfKind(ts.SyntaxKind.MethodDeclaration);
      const installer = functions.find(f => f.getChildren()[0].getText() === 'installModifier');
      const updater = functions.find(f => f.getChildren()[0].getText() === 'updateModifier');
      const destroyer = functions.find(f => f.getChildren()[0].getText() === 'destroyModifier');

      let validFn;
      validFn = validFn || (installer.getParameters().length === 3 && installer);
      validFn = validFn || (updater.getParameters().length === 2 && updater);
      validFn = validFn || (destroyer.getParameters().length === 2 && destroyer);

      const txt = validFn.getFullText();

      try {
        modifierWrapper.remove();
      } catch (e) {}

      declaration.remove();

      return `${modifierFile.getFullText()} export default ${txt}`;
    }
  }
  return null;
}

const h = getModifier('./node_modules/@ember/render-modifiers/addon/modifiers/did-insert.js');
console.log(h);