92 lines
2.4 KiB
JavaScript
92 lines
2.4 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.visitor = void 0;
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var _core = require("@babel/core");
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function getTDZStatus(refPath, bindingPath) {
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const executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
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if (executionStatus === "before") {
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return "outside";
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} else if (executionStatus === "after") {
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return "inside";
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} else {
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return "maybe";
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}
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}
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function buildTDZAssert(node, state) {
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return _core.types.callExpression(state.addHelper("temporalRef"), [node, _core.types.stringLiteral(node.name)]);
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}
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function isReference(node, scope, state) {
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const declared = state.letReferences.get(node.name);
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if (!declared) return false;
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return scope.getBindingIdentifier(node.name) === declared;
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}
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const visitor = {
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ReferencedIdentifier(path, state) {
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if (!state.tdzEnabled) return;
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const {
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node,
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parent,
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scope
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} = path;
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if (path.parentPath.isFor({
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left: node
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})) return;
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if (!isReference(node, scope, state)) return;
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const bindingPath = scope.getBinding(node.name).path;
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if (bindingPath.isFunctionDeclaration()) return;
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const status = getTDZStatus(path, bindingPath);
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if (status === "outside") return;
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if (status === "maybe") {
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const assert = buildTDZAssert(node, state);
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bindingPath.parent._tdzThis = true;
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path.skip();
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if (path.parentPath.isUpdateExpression()) {
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if (parent._ignoreBlockScopingTDZ) return;
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path.parentPath.replaceWith(_core.types.sequenceExpression([assert, parent]));
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} else {
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path.replaceWith(assert);
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}
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} else if (status === "inside") {
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path.replaceWith(_core.template.ast`${state.addHelper("tdz")}("${node.name}")`);
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}
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},
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AssignmentExpression: {
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exit(path, state) {
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if (!state.tdzEnabled) return;
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const {
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node
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} = path;
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if (node._ignoreBlockScopingTDZ) return;
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const nodes = [];
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const ids = path.getBindingIdentifiers();
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for (const name of Object.keys(ids)) {
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const id = ids[name];
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if (isReference(id, path.scope, state)) {
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nodes.push(id);
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}
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}
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if (nodes.length) {
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node._ignoreBlockScopingTDZ = true;
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nodes.push(node);
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path.replaceWithMultiple(nodes.map(n => _core.types.expressionStatement(n)));
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}
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}
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}
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};
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exports.visitor = visitor;
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