jacobp100 / babel-plugin-swift-blocks

Swift-style blocks for JS

No Longer Works

Due to changes in how Babel is packaged, this no longer works.

babel-plugin-swift-blocks

Experiment at extending Babel syntax.

Enables more swift-like syntax in JavaScript: you can omit the parens for the condition in all if, for*, while, do-while statements so long as you use braces.

See paren-free.

Also see blog post.

Valid

if condition {
  doSomething();
} else if otherCondition {
  doSomethingElse();
} else {
  doAThirdThing();
}

for const i in object {
  doSomething(i);
}

for const i of iterable {
  doSomething(i);
}

do {
  doSomething(i);
} while condition;

Invalid

if condition
  doSomething();

for const i in object
  doSomething(i);

for const i of iterable
  doSomething(i);

do
  doSomething(i);
while condition;

Swift doesn't have imperative for-loops, so these are also invalid.

// invalid
for let i = 0; condition; i += 1 {
  doSomething(i);
}

Note that for if conditions, your paren style must be consistent.

// Invalid
if condition {
  doSomething();
} else
  doSomethingElse();

if condition {
  doSomething();
} else if otherCondition {
  doSomethingElse();
} else
  doAThirdThing();

People who like language grammars might notice this is being cheeky, since when you write else if, the if statement is actually its own statement without braces. Subsequent ifs, and nothing else, are allowed to use implicit braces after an else.

babel-plugin-swift-blocks's Issues

All tests fail

failed with "Cannot find module 'babylon/lib/parser'"