Estree-to-babel [![NPM version][NPMIMGURL]][NPMURL] [![Build Status][BuildStatusIMGURL]][BuildStatusURL] [![Coverage Status][CoverageIMGURL]][CoverageURL]

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Convert ESTree-compatible JavaScript AST to Babel AST.

To use parsers like:

- acorn
- cherow
- espree
- etc...

With babel tools like:

- @babel/traverse
- @babel/types
- etc...

The thing is @babel/parser has a little differences with estree standard:

- Property of ObjectExpression and ObjectPattern called ObjectProperty;
- FunctionExpression of a Property located in ObjectMethod node;
- File node;
- StringLiteral, NumericLiteral, NullLiteral, RegExpLiteral, BooleanLiteral instead of Literal;
- ClassMethod instead of MethodDefinition;
- ClassPrivateMethod;
- ClassPrivateName stores name as Identifier in id field;
- ClassPrivateProperty instead of FieldDefinition;
- OptionalMemberExpression and OptionalCallExpression instead of ChainExpression;
- ImportDeclaration and ExportNamedDeclaration has attributes;
- JSXText has extra field;
- extra.parenthesized=true instead of ParenthesizedExpression;
- etc...

Also @babel/parser has differences with typescript-estree:

- ClassPrivateProperty instead of PropertyDefinition when key.type=PrivateName;
- ClasseProperty instead of PropertyDefinition when key.type=Identifier;
- PrivateName instead of PrivateIdentifier;
- TSQualifiedName instead of MemberExpression in TSInterfaceHeritage;
- TSDeclaredMethod with abstract=true instead of TSAbstractMethodDefinition;
- extra.parenthesized=true instead of TSParenthesizedType;
- etc...

estree-to-babel aims to smooth this differences.

Install

``
npm i estree-to-babel
`

$3

`js
import {parse} from 'cherow';
import {estreeToBabel} from 'estree-to-babel';
import {traverse} from '@babel/traverse';

const ast = estreeToBabel(parse(
const f = ({a}) => a;
));

traverse({
ObjectProperty(path) {
console.log(path.value.name);
// output
'a';
},
});
`

You can provide options:

`js
import * as cherow from 'cherow';
import {estreeToBabel} from 'estree-to-babel';
import traverse from '@babel/traverse';

const options = {
convertParens: false,
};

const ast = estreeToBabel(cherow.parse(
(a = b)
), options);

traverse({
AssignmentExpression(path) {
console.log(path.parentPath.type);
// output
'ParenthesizedExpression';
},
});
``

License

MIT