57 lines
2 KiB
JavaScript
57 lines
2 KiB
JavaScript
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"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 = hoistVariables;
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var t = _interopRequireWildcard(require("@babel/types"));
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function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
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const visitor = {
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Scope(path, state) {
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if (state.kind === "let") path.skip();
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},
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Function(path) {
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path.skip();
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},
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VariableDeclaration(path, state) {
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if (state.kind && path.node.kind !== state.kind) return;
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const nodes = [];
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const declarations = path.get("declarations");
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let firstId;
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for (const declar of declarations) {
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firstId = declar.node.id;
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if (declar.node.init) {
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nodes.push(t.expressionStatement(t.assignmentExpression("=", declar.node.id, declar.node.init)));
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}
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for (const name of Object.keys(declar.getBindingIdentifiers())) {
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state.emit(t.identifier(name), name, declar.node.init !== null);
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}
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}
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if (path.parentPath.isFor({
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left: path.node
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})) {
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path.replaceWith(firstId);
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} else {
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path.replaceWithMultiple(nodes);
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}
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}
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};
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function hoistVariables(path, emit, kind = "var") {
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path.traverse(visitor, {
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kind,
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emit
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});
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}
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