84 lines
No EOL
2.1 KiB
JavaScript
84 lines
No EOL
2.1 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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function _helperPluginUtils() {
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const data = require("@babel/helper-plugin-utils");
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_helperPluginUtils = function () {
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return data;
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};
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return data;
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}
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function _core() {
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const data = require("@babel/core");
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_core = function () {
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return data;
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};
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return data;
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}
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var _default = (0, _helperPluginUtils().declare)(api => {
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api.assertVersion(7);
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return {
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name: "transform-typeof-symbol",
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visitor: {
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Scope({
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scope
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}) {
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if (!scope.getBinding("Symbol")) {
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return;
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}
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scope.rename("Symbol");
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},
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UnaryExpression(path) {
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const {
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node,
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parent
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} = path;
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if (node.operator !== "typeof") return;
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if (path.parentPath.isBinaryExpression() && _core().types.EQUALITY_BINARY_OPERATORS.indexOf(parent.operator) >= 0) {
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const opposite = path.getOpposite();
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if (opposite.isLiteral() && opposite.node.value !== "symbol" && opposite.node.value !== "object") {
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return;
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}
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}
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const helper = this.addHelper("typeof");
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const isUnderHelper = path.findParent(path => {
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return path.isVariableDeclarator() && path.node.id === helper || path.isFunctionDeclaration() && path.node.id && path.node.id.name === helper.name;
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});
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if (isUnderHelper) {
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return;
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}
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const call = _core().types.callExpression(helper, [node.argument]);
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const arg = path.get("argument");
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if (arg.isIdentifier() && !path.scope.hasBinding(arg.node.name, true)) {
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const unary = _core().types.unaryExpression("typeof", _core().types.cloneNode(node.argument));
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path.replaceWith(_core().types.conditionalExpression(_core().types.binaryExpression("===", unary, _core().types.stringLiteral("undefined")), _core().types.stringLiteral("undefined"), call));
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} else {
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path.replaceWith(call);
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}
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}
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}
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};
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});
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exports.default = _default; |