React Native `npm start` with watchman error

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青春惊慌失措
青春惊慌失措 2021-01-13 23:43

I was first getting this issue: https://github.com/facebook/react-native/issues/10088

Then I followed this solution to resolve for that issue: https://github.com/fac

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  • 2021-01-14 00:05

    I solved this problem by following the solution provided by David but I had to do some extra steps because I already had installed watchman using brew. Here are the list of commands for the solution:

    Deleting watchman (installed by brew):

    $ brew install rmtree
    $ brew rmtree watchman
    $ sudo rm -rf /usr/local/var/run/watchman
    

    Manually install Watchman v4.7.0 (credits to David):

    $ git clone https://github.com/facebook/watchman.git
    $ cd watchman
    $ git checkout v4.7.0
    $ ./autogen.sh
    $ ./configure
    $ make
    $ sudo make install
    

    Chmod your user's watchman state directory:

    $ chmod 0700 /usr/local/var/run/watchman/<user>-state
    
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  • 2021-01-14 00:12

    run this command inside project folder

    watchman watch-del-all && npm start --reset-cache
    
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  • 2021-01-14 00:23

    I have a simular issue and looking at the logs for Watchman I get these errors happening each time you see the "Lost Connection to Watchman" message.

    2016-11-05T03:35:48,401: [listener] Watchman 4.7.0 <no build info set> starting up on Davids-Mac.local
    
    2016-11-05T03:35:48,401: [listener] path /Users/david/Projects/react-native-test is on filesystem type hfs
    
    2016-11-05T03:35:48,402: [listener] root /Users/david/Projects/react-native-test using watcher mechanism fsevents (auto was requested)
    
    2016-11-05T03:35:48,406: [listener] file limit is 2560 kern.maxfilesperproc=10240
    
    2016-11-05T03:35:48,406: [listener] raised file limit to 10240
    
    2016-11-05T03:35:48,407: [listener] Using socket from launchd as listening socket
    
    2016-11-05T03:35:48,934: [io 0x7f8175600ff8 /Users/david/Projects/react-native-test] PERF: {"ru_nvcsw": 0, "ru_nsignals": 0, "ru_msgrcv": 6, "ru_msgsnd": 6, "ru_inblock": 0, "ru_majflt": 0, "ru_nswap": 0, "ru_minflt": 5230, "ru_ixrss": 0, "ru_maxrss": 21405696, "system_time": 0.32367200000000002, "user_time": 0.18271599999999999, "elapsed_time": 0.53129999999999999, "pid": 9867, "ru_idrss": 0, "meta": {"root": {"watcher": "fsevents", "ticks": 2, "number": 1, "case_sensitive": false, "recrawl_count": 0, "path": "/Users/david/Projects/react-native-test"}}, "version": "4.7.0", "ru_oublock": 0, "ru_nivcsw": 112, "start_time": 1478316948.403332, "description": "full-crawl"}
    
    2016-11-05T03:35:48,935: [io 0x7f8175600ff8 /Users/david/Projects/react-native-test] crawl complete
    
    2016-11-05T03:35:49,029: [client=0x7f8176a00038:stm=0x7f8176a00000] Unilateral payload for sub sane-sub {"settled": true}
    
    Terminating due to signal 11 Segmentation fault generated by pid=0 uid=0. address not mapped to object (0x0)
    0   watchman                            0x0000000105973759 _ZL13crash_handleriP9__siginfoPv + 347
    1   libsystem_platform.dylib            0x00007fffa2292bba _sigtramp + 26
    2   ???                                 0x00007f81756000c0 0x0 + 140193996734656
    3   watchman                            0x000000010596f9b2 _ZN6detail22estimateSpaceToReserveIPKcJA3_cA28_c8w_stringA2_cPcS6_EEEmmRKT_DpRKT0_ + 109
    4   watchman                            0x000000010596f815 _ZN8w_string5buildIJPcRA4_KcPS2_RA3_S2_RA28_S2_RS_RA2_S2_RS1_SC_EEES_DpOT_ + 121
    5   watchman                            0x000000010599b4cb _ZN8watchman3Log3logIJRA28_KcR8w_stringRA2_S2_RPcS8_EEEvNS_8LogLevelEDpOT_ + 183
    6   watchman                            0x000000010599a6e0 _ZNSt3__114__thread_proxyINS_5tupleIJZL15make_new_clientP15watchman_streamE3$_0EEEEEPvS6_ + 952
    7   libsystem_pthread.dylib             0x00007fffa229cabb _pthread_body + 180
    8   libsystem_pthread.dylib             0x00007fffa229ca07 _pthread_body + 0
    9   libsystem_pthread.dylib             0x00007fffa229c231 thread_start + 13
    

    UPDATE: Ok, found a solution which so far seems to work. I uninstall watchman completely, then build it from source using the following which seems to work fine (any attempt at installing via brew causes the problems above but this works):

    $ git clone https://github.com/facebook/watchman.git
    $ cd watchman
    $ git checkout v4.7.0  # the latest stable release
    $ ./autogen.sh
    $ ./configure
    $ make
    $ sudo make install
    
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