Jsonnet: [Website] Interactive tutorial - "TypeError: Module.UTF8ToString is not a function"

[sbarzowski]

Whenever I change the code on the website the following error shows up:

TypeError: Module.UTF8ToString is not a function"

I have recently updated the website, but the commit does not touch the libjsonnet.js.

@sparkprime Do you have any ideas for what it might be, or how to fix it? Should I revert (but then the stdlib docs will be really out of date).

[buremba]

The interactive editor still doesn't work.

[ivan4th]

FYI, it can be fixed with the following bookmarklet:

javascript:void(Module.UTF8ToString=UTF8ToString)

Usable as an interim solution for playing around with the examples till the website is fixed.

[sparkprime]

So this emscripten library function is nolonger accessed through Module (or never was, and luckily worked until some new version)?

[buremba]

This commit looks like the cause: https://github.com/google/jsonnet/commit/c323f5ce5b8aa663585d23dc0fb94d4b166c6f16#diff-f1185dfe3c71b3025eaf7ba31336a40bL39

When I revert it to Pointer_stringify it works as expected.

[sbarzowski]

Weird. Pointer_stringify was deprecated in favor of UTF8ToString.

[FranklinYu]

UTF8ToString is in preamble, so I guess it should be called directly.

[sparkprime]

I tried to rebuild it locally, but got this!

Error: abort(Assertion failed: you need to wait for the runtime to be ready (e.g. wait for main() to be called)) at Error
    at jsStackTrace (http://localhost:8200/js/libjsonnet.js:47:16244)
    at stackTrace (http://localhost:8200/js/libjsonnet.js:47:16412)
    at abort (http://localhost:8200/js/libjsonnet.js:47:13259)
    at assert (http://localhost:8200/js/libjsonnet.js:47:1647)
    at Module._jsonnet_make (http://localhost:8200/js/libjsonnet.js:47:97850)
    at ccall (http://localhost:8200/js/libjsonnet.js:47:2575)
    at http://localhost:8200/js/libjsonnet.js:47:2737
    at jsonnet_evaluate_snippet_wrapped (http://localhost:8200/js/demo.js:60:12)
    at http://localhost:8200/js/demo.js:382:20
    at http://localhost:8200/js/demo.js:287:9

[sparkprime]

That seemed to be caused by another error "mb is not defined"

However... If I build without -Os the problem goes away. I'm going to push the site with this new js file.

[sparkprime]

I still get these but assuming they are benign

wasm2js: warning: global scope may be colliding with other scope: bool_20std____2__operator___char_2c_20std____2__char_traits_char__2c_20std____2__allocator_char__20__28std____2__basic_string_char_2c_20std____2__char_traits_char__2c_20std____2__allocator_char__20__20const__2c_20char_20const__29
wasm2js: warning: global scope may be colliding with other scope: bool_20std____2__operator___char_2c_20std____2__char_traits_char__20__28std____2__istreambuf_iterator_char_2c_20std____2__char_traits_char__20__20const__2c_20std____2__istreambuf_iterator_char_2c_20std____2__char_traits_char__20__20const__29
wasm2js: warning: global scope may be colliding with other scope: bool_20std____2__operator___wchar_t_2c_20std____2__char_traits_wchar_t__20__28std____2__istreambuf_iterator_wchar_t_2c_20std____2__char_traits_wchar_t__20__20const__2c_20std____2__istreambuf_iterator_wchar_t_2c_20std____2__char_traits_wchar_t__20__20const__29
warning: Output contains some very large functions (5497 lines in $28anonymous_20namespace_29__Interpreter__evaluate_28AST_20const__2c_20unsigned_20int_29), consider building source files with -Os or -Oz)

[sparkprime]

Well it works again for me. Reopen the bug if there's still issues. Thanks for the reports and workarounds in the meantime!

[sparkprime]

For the record:

dcunnin@dcunnin:~$ em++ --version
emcc (Emscripten gcc/clang-like replacement) 1.39.8 (commit 1458145cf4f3db0fb548343e6acab267eef8e4ef)
Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[FranklinYu]

Fix verified on Chrome, Debian. Thanks!