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There's always a comment like this in most discussions about javascript.

> WebAssembly failed to keep some of its promises here

classic case of not using an await before your promise

As wonky as JS is I really like it. Typescript has done such a good job at making it fun to use.

Where can I find these not kept promises?

They haven't yet made languages other than JavaScript first-class languages for the web - https://hacks.mozilla.org/2026/02/making-webassembly-a-first.... I wouldn't call this a broken promise, but it was something people were hoping would take less than a decade.