0879a6d608
* Add Subsume JSON transform https://github.com/tc39/proposal-json-superset is at stage 3. This allows U+2028 LINE SEPARATOR and U+2029 PARAGRAPH SEPARATOR to appear unescaped inside strings and directives. * Move to Stage 3 * Break diretive parsing * Update README * Handle multi-escape sequences * Remove babylon files after rename
@babel/preset-stage-3
Babel preset for stage 3 plugins.
The gist of Stage 3 is:
Stage 3: candidate
What is it? The proposal is mostly finished and now needs feedback from implementations and users to progress further.
What’s required? The spec text must be complete. Designated reviewers (appointed by TC39, not by the champion) and the ECMAScript spec editor must sign off on the spec text. There must be at least two spec-compliant implementations (which don’t have to be enabled by default).
What’s next? Henceforth, changes should only be made in response to critical issues raised by the implementations and their use.
Install
npm install --save-dev @babel/preset-stage-3
Usage
Via .babelrc (Recommended)
.babelrc
{
"presets": ["@babel/preset-stage-3"]
}
Via CLI
babel script.js --presets @babel/preset-stage-3
Via Node API
require("@babel/core").transform("code", {
presets: ["@babel/preset-stage-3"]
});
Options
loose
boolean, defaults to false.
Enable "loose" transformations for any plugins in this preset that allow them.
useBuiltIns
boolean, defaults to false.
Will use the native built-in instead of trying to polyfill behavior for any plugins that require one.
References
- Chapter "The TC39 process for ECMAScript features" in "Exploring ES2016 and ES2017" by Axel Rauschmayer