c285d5409e
This is the last step to make https://github.com/babel/babel/pull/9364 usable in Babel. I'm sorry for opening this PR so late, but I hope to get it in v7.4. In this PR I added a new option to `@babel/template`, `syntacticPlaceholders: ?boolean`, which toggles between `%%foo%%` placeholders (when `true`) and `FOO` placeholders. If it isn't specified, Babel tries to be "smart" to avoid breaking backward compat: if `%%foo%%` is used `syntacticPlaceholders` defaults to `true`, otherwise to `false`. 0e58e252913efe84eba926cc9c9c19fb18d5c620 commit shows how some templates we used could be simplified by using this new placeholders syntax (we can't actually do it yet because we are importing `template` from `@babel/core` which could be an older version). NOTE: Since I wanted to keep this PR as small as possible to make it easier to review, I didn't migrate `template.ast` to internally use the new syntax. It is an implementation detail, so it will be possible to change it in a patch release.
The compiler for writing next generation JavaScript.
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Intro
Babel is a tool that helps you write code in the latest version of JavaScript. When your supported environments don't support certain features natively, Babel will help you compile those features down to a supported version.
In
// ES2015 arrow function
[1, 2, 3].map((n) => n + 1);
Out
[1, 2, 3].map(function(n) {
return n + 1;
});
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