node-syntax-tree

node-syntax-tree is a node package for executing Syntax Tree in a WASM environment. It functions by compiling the Ruby interpreter and Syntax Tree source files into a WASM package that is loaded and executed at runtime.

Getting started

If you're using the npm:

npm install --save node-syntax-tree

Or if you're using yarn, then add the plugin by:

yarn add node-syntax-tree

Usage

node-syntax-tree provides both CJS and ESM modules distributions. To require through CJS, run:

const { default: createSyntaxTree } = require("node-syntax-tree");

To require through ESM, run:

import createSyntaxTree from "node-syntax-tree";

Once you have the import, you can initial the virtual machine and run the associated functions, as in:

createSyntaxTree().then((syntaxTree) => {
  console.log(syntaxTree.handlers.ruby.parse("foo"));
  // => (program (statements ((vcall (ident "foo")))))

  console.log(syntaxTree.handlers.ruby.format("1+1"));
  // => 1 + 1

  console.log(syntaxTree.handlers.haml.parse("= foo"));
  // => (root children=[(script text=" foo")])

  console.log(syntaxTree.handlers.haml.format("=  foo"));
  // => = foo
});

You can access all of the various Syntax Tree plugins except RBS.

TypeScript types are provided along with this package, and effectively boil down to:

type SyntaxTreeHandler = {
    format(source: string): string;
    parse(source: string): string;
    read(filepath: string): string;
};

type SyntaxTree = {
  handlers: Record<"bf" | "css" | "haml" | "json" | "ruby" | "xml", SyntaxTreeHandler>
};

function createSyntaxTree(): Promise<SyntaxTree>;

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby-syntax-tree/node-syntax-tree.

License

The package is available as open source under the terms of the MIT License.