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Add transformer to import regeneratorRuntime from a module

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Thanks to facebook/regenerator#167 Regenerator's runtime can be now
required as a module (though not in an easily self-containable way).
This transformer, together with `coreAliasing` and `externalRuntime`,
allows users to ditch a runtime dependency on `6to5`/`6to5-core` to
depend directly on `core-js` and `regenerator`.
This commit is contained in:
Aluísio Augusto Silva Gonçalves 2015-01-17 23:02:20 -02:00
parent 81bec3e5c4
commit d4cc8fefd1
2 changed files with 17 additions and 0 deletions
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1
lib/6to5/transformation/transform.js
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@ -95,6 +95,7 @@ _.each({
typeofSymbol: require("./transformers/optional-typeof-symbol"),
coreAliasing: require("./transformers/optional-core-aliasing"),
externalRegenerator: require("./transformers/optional-external-regenerator-runtime"),
undefinedToVoid: require("./transformers/optional-undefined-to-void"),
// spec

16
lib/6to5/transformation/transformers/optional-external-regenerator-runtime.js Normal file
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@ -0,0 +1,16 @@
var t = require("../../types");
exports.optional = true;
exports.ast = {
enter: function (ast, file) {
file._regeneratorId = file.addImport("regenerator/runtime-module", "regeneratorRuntime");
}
};
exports.MemberExpression = function (node, parent, scope, context, file) {
var obj = node.object;
var prop = node.property;
if (!t.isReferenced(node, parent) || !t.isReferenced(obj, node)) return;
if (obj.name === "regeneratorRuntime") return t.memberExpression(file._regeneratorId, prop);
};