deno_lint 0.2.10

lint for deno
Documentation 
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// Copyright 2020 the Deno authors. All rights reserved. MIT license.
use super::Context;
use super::LintRule;
use swc_ecmascript::ast::WithStmt;
use swc_ecmascript::visit::noop_visit_type;
use swc_ecmascript::visit::Node;
use swc_ecmascript::visit::Visit;

pub struct NoWith;

const CODE: &str = "no-with";
const MESSAGE: &str = "`with` statement is not allowed";

impl LintRule for NoWith {
  fn new() -> Box<Self> {
    Box::new(NoWith)
  }

  fn tags(&self) -> &'static [&'static str] {
    &["recommended"]
  }

  fn code(&self) -> &'static str {
    CODE
  }

  fn lint_program(
    &self,
    context: &mut Context,
    program: &swc_ecmascript::ast::Program,
  ) {
    let mut visitor = NoWithVisitor::new(context);
    visitor.visit_program(program, program);
  }
}

struct NoWithVisitor<'c> {
  context: &'c mut Context,
}

impl<'c> NoWithVisitor<'c> {
  fn new(context: &'c mut Context) -> Self {
    Self { context }
  }
}

impl<'c> Visit for NoWithVisitor<'c> {
  noop_visit_type!();

  fn visit_with_stmt(&mut self, with_stmt: &WithStmt, _parent: &dyn Node) {
    self.context.add_diagnostic(with_stmt.span, CODE, MESSAGE);
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn no_with_invalid() {
    assert_lint_err! {
      NoWith,
      "with (someVar) { console.log('asdf'); }": [{ col: 0, message: MESSAGE }],
    }
  }
}