Function makePrintableStringIfPossible

src/util/log.ts:83–92

(val: unknown)

        // Fuzzy stringify for print.
        // This code only exist in dev environment.
        const makePrintableStringIfPossible = (val: unknown): string => {
            return val === void 0 ? 'undefined'
                : val === Infinity ? 'Infinity'
                : val === -Infinity ? '-Infinity'
                : eqNaN(val) ? 'NaN'
                : val instanceof Date ? 'Date(' + val.toISOString() + ')'
                : isFunction(val) ? 'function () { ... }'
                : isRegExp(val) ? val + ''
                : null;
        };
        msg = map(hintInfo, arg => {
            if (isString(arg)) {
                // Print without quotation mark for some statement.