Parse in reverse. AST goes in, code comes out.
import { print } from 'esrap';
const { code, map } = print({
type: 'Program',
body: [
{
type: 'ExpressionStatement',
expression: {
callee: {
type: 'Identifier',
name: 'alert'
},
arguments: [
{
type: 'Literal',
value: 'hello world!'
}
]
}
}
]
});
console.log(code); // alert('hello world!');If the nodes of the input AST have loc properties (e.g. the AST was generated with acorn with the locations option set), sourcemap mappings will be created.
You can pass information that will be added to the resulting sourcemap (note that the AST is assumed to come from a single file):
const { code, map } = print(ast, {
sourceMapSource: 'input.js',
sourceMapContent: fs.readFileSync('input.js', 'utf-8')
});esrap can also print TypeScript nodes, assuming they match the ESTree-like @typescript-eslint/types.
Because it's ginormous.
This repo uses pnpm. Once it's installed, do pnpm install to install dependencies, and pnpm test to run the tests.