Function expect

docs/assets/getting-started-assets/javascripts/JSXTransformer.js:5682–5687

(value)

                        // If not, an exception will be thrown.

                        function expect(value) {
                            var token = lex()
                            if (token.type !== Token.Punctuator || token.value !== value) {
                                throwUnexpected(token)
                            }
                        }

                        // Expect the next token to match the specified keyword.
                        // If not, an exception will be thrown.