05b22d2597
This commit introduces 4 changes:
1) Function declarations are wrapped using function declarations.
This has two advantages:
- We can rely on native hoisting, instead of using _blockHoist
- The function isn't wrapped until it is called. This avoids
problems where `regeneratorRuntime.wrap` was called before
that `babel-polyfill` was imported.
Example:
function fn() {}
// becomes
function fn() { return _fn.apply(this, arguments); }
function _fn() {
_fn = _wrapper(/* Original function ... */);
return _fn.apply(this, arguments);
}
2) Use a single template for both named and anonymous function
expressions. They already had the same behavior, but the one
used for named functions was a bit longer.
3) Use normal functions instead of arrow functions to wrap
function expressions.
4) Generate a name based on the original one for wrapped
functions (e.g. `foo` becomes `_foo` instead of `_ref`).
@babel/plugin-proposal-function-sent
Compile the
function.sentmeta property, used inside generator functions, to valid ES2015 code.
Example
function* generator() {
console.log("Sent", function.sent);
console.log("Yield", yield);
}
const iterator = generator();
iterator.next(1); // Logs "Sent 1"
iterator.next(2); // Logs "Yield 2"
Is compiled roughly to
let generator = _skipFirstGeneratorNext(function* () {
const _functionSent = yield;
console.log("Sent", _functionSent);
console.log("Yield", yield);
});
const iterator = generator();
iterator.next(1); // Logs "Sent 1"
iterator.next(2); // Logs "Yield 1"
Installation
npm install --save-dev @babel/plugin-proposal-function-sent
Usage
Via .babelrc (Recommended)
.babelrc
{
"plugins": ["@babel/plugin-proposal-function-sent"]
}
Via CLI
babel --plugins @babel/plugin-proposal-function-sent script.js
Via Node API
require("@babel/core").transform("code", {
plugins: ["@babel/plugin-proposal-function-sent"]
});