Updating arbitrary properties

[aleclarson]

While the set method currently only works with properties that typically contain a Node object or an array of Node objects, it should work with any property that makes sense to update.

Supporting this will require a new module that exports an object like so:

exports.VariableDeclaration = {
  setKind(value, output) {
    output.overwrite(this.start, this.start + this.kind.length, value);
  }
};

Then, node.set('kind', 'var') would turn let a = 1 into var a = 1.

The exports would be restructured (on startup) into something like:

exports.set = {
  VariableDeclaration: {
    kind(value, output) { /* ... */ }
  }
};

The push, unshift, and splice methods might have their own edge cases, too. These would be handled similarly with insertProperty-style functions.

Same for the remove method with removeProperty-style functions.

[aleclarson]

This is supported as of v2.0.0 in the src/mutation.ts module. (see the replacers export)

You'll need to implement a property setter for the property you want to update. PRs welcome.