Function start

lib/parse.js:611–623

()

    },

    start () {
        switch (c) {
        case '{':
        case '[':
            return newToken('punctuator', read())

        // This code is unreachable since the default lexState handles eof.
        // case undefined:
        //     return newToken('eof')
        }

        lexState = 'value'
    },

    beforePropertyName () {
        switch (c) {