emberjs/ember.js · error · SyntaxError

Handlebars decorator blocks are not supported

Error message

Handlebars decorator blocks are not supported

What it means

Error "Handlebars decorator blocks are not supported" thrown in emberjs/ember.js.

Source

Thrown at packages/@glimmer/syntax/lib/parser/handlebars-node-visitors.ts:382

    );
  }

  PartialBlockStatement(partialBlock: HBS.PartialBlockStatement): never {
    throw generateSyntaxError(
      `Handlebars partial blocks are not supported`,
      this.source.spanFor(partialBlock.loc)
    );
  }

  Decorator(decorator: HBS.Decorator): never {
    throw generateSyntaxError(
      `Handlebars decorators are not supported`,
      this.source.spanFor(decorator.loc)
    );
  }

  DecoratorBlock(decoratorBlock: HBS.DecoratorBlock): never {
    throw generateSyntaxError(
      `Handlebars decorator blocks are not supported`,
      this.source.spanFor(decoratorBlock.loc)
    );
  }

  SubExpression(sexpr: HBS.SubExpression): ASTv1.SubExpression {
    const { path, params, hash } = acceptCallNodes(this, sexpr);
    return b.sexpr({ path, params, hash, loc: this.source.spanFor(sexpr.loc) });
  }

  PathExpression(path: HBS.PathExpression): ASTv1.PathExpression {
    const { original } = path;
    let parts: string[];

    if (original.indexOf('/') !== -1) {
      if (original.slice(0, 2) === './') {
        throw generateSyntaxError(
          `Using "./" is not supported in Glimmer and unnecessary`,

View on GitHub (pinned to 26f97246a8)

When it happens

Trigger: Thrown at packages/@glimmer/syntax/lib/parser/handlebars-node-visitors.ts:382 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emberjs/ember.js@26f97246a8 (2026-09-01). Data as JSON: /api/errors/8aca38c427a91a56. Report an issue: GitHub.