Function checkNode

test/fixtures/snapshot/typescript.js:160311–160495

(nodeToCheck)

                }
                // Verifies whether we can actually extract this node or not.
                function checkNode(nodeToCheck) {
                    var PermittedJumps;
                    (function (PermittedJumps) {
                        PermittedJumps[PermittedJumps["None"] = 0] = "None";
                        PermittedJumps[PermittedJumps["Break"] = 1] = "Break";
                        PermittedJumps[PermittedJumps["Continue"] = 2] = "Continue";
                        PermittedJumps[PermittedJumps["Return"] = 4] = "Return";
                    })(PermittedJumps || (PermittedJumps = {}));
                    // We believe it's true because the node is from the (unmodified) tree.
                    ts.Debug.assert(nodeToCheck.pos <= nodeToCheck.end, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809 (1)");
                    // For understanding how skipTrivia functioned:
                    ts.Debug.assert(!ts.positionIsSynthesized(nodeToCheck.pos), "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809 (2)");
                    if (!ts.isStatement(nodeToCheck) && !(ts.isExpressionNode(nodeToCheck) && isExtractableExpression(nodeToCheck)) && !isStringLiteralJsxAttribute(nodeToCheck)) {
                        return [ts.createDiagnosticForNode(nodeToCheck, Messages.statementOrExpressionExpected)];
                    }
                    if (nodeToCheck.flags & 16777216 /* NodeFlags.Ambient */) {
                        return [ts.createDiagnosticForNode(nodeToCheck, Messages.cannotExtractAmbientBlock)];
                    }
                    // If we're in a class, see whether we're in a static region (static property initializer, static method, class constructor parameter default)
                    var containingClass = ts.getContainingClass(nodeToCheck);
                    if (containingClass) {
                        checkForStaticContext(nodeToCheck, containingClass);
                    }
                    var errors;
                    var permittedJumps = 4 /* PermittedJumps.Return */;
                    var seenLabels;
                    visit(nodeToCheck);
                    if (rangeFacts & RangeFacts.UsesThis) {
                        var container = ts.getThisContainer(nodeToCheck, /** includeArrowFunctions */ false);
                        if (container.kind === 256 /* SyntaxKind.FunctionDeclaration */ ||
                            (container.kind === 169 /* SyntaxKind.MethodDeclaration */ && container.parent.kind === 205 /* SyntaxKind.ObjectLiteralExpression */) ||
                            container.kind === 213 /* SyntaxKind.FunctionExpression */) {
                            rangeFacts |= RangeFacts.UsesThisInFunction;
                        }
                    }
                    return errors;
                    function visit(node) {
                        if (errors) {
                            // already found an error - can stop now
                            return true;
                        }
                        if (ts.isDeclaration(node)) {
                            var declaringNode = (node.kind === 254 /* SyntaxKind.VariableDeclaration */) ? node.parent.parent : node;
                            if (ts.hasSyntacticModifier(declaringNode, 1 /* ModifierFlags.Export */)) {
                                // TODO: GH#18217 Silly to use `errors ||` since it's definitely not defined (see top of `visit`)
                                // Also, if we're only pushing one error, just use `let error: Diagnostic | undefined`!
                                // Also TODO: GH#19956
                                (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractExportedEntity));
                                return true;
                            }
                            declarations.push(node.symbol);
                        }
                        // Some things can't be extracted in certain situations
                        switch (node.kind) {
                            case 266 /* SyntaxKind.ImportDeclaration */:
                                (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractImport));
                                return true;
                            case 271 /* SyntaxKind.ExportAssignment */: