index.js
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _core = require("@babel/core");
var _default = (0, _helperPluginUtils.declare)(api => {
api.assertVersion(7);
return {
name: "transform-typeof-symbol",
visitor: {
Scope({
scope
}) {
if (!scope.getBinding("Symbol")) {
return;
}
scope.rename("Symbol");
},
UnaryExpression(path) {
const {
node,
parent
} = path;
if (node.operator !== "typeof") return;
if (path.parentPath.isBinaryExpression() && _core.types.EQUALITY_BINARY_OPERATORS.indexOf(parent.operator) >= 0) {
const opposite = path.getOpposite();
if (opposite.isLiteral() && opposite.node.value !== "symbol" && opposite.node.value !== "object") {
return;
}
}
let isUnderHelper = path.findParent(path => {
if (path.isFunction()) {
var _path$get;
return ((_path$get = path.get("body.directives.0")) == null ? void 0 : _path$get.node.value.value) === "@babel/helpers - typeof";
}
});
if (isUnderHelper) return;
const helper = this.addHelper("typeof");
isUnderHelper = path.findParent(path => {
return path.isVariableDeclarator() && path.node.id === helper || path.isFunctionDeclaration() && path.node.id && path.node.id.name === helper.name;
});
if (isUnderHelper) {
return;
}
const call = _core.types.callExpression(helper, [node.argument]);
const arg = path.get("argument");
if (arg.isIdentifier() && !path.scope.hasBinding(arg.node.name, true)) {
const unary = _core.types.unaryExpression("typeof", _core.types.cloneNode(node.argument));
path.replaceWith(_core.types.conditionalExpression(_core.types.binaryExpression("===", unary, _core.types.stringLiteral("undefined")), _core.types.stringLiteral("undefined"), call));
} else {
path.replaceWith(call);
}
}
}
};
});
exports.default = _default;