fix(directives): report server functions that cannot work - #2318
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A server function is moved to the top level of its module, and several shapes stop working once it is. They compiled without complaint before. - Fail the build when a server function reads a variable from an enclosing function, uses `this` or `arguments` in an arrow, uses `super`, or reads a private class member. - Fail the build when the directive is in an object or class method. The transform ignored it, which shipped the method body and the modules it imports to the browser. - Warn when a directive string is not the first statement of a module or a function body, where it has no effect. - Warn for each export a "use server" module cannot serve, naming it. Those exports are still left out of the client build. - Support an anonymous default export from a "use server" module. - Compile server functions in `.mts` and `.cts` files. - Point build errors at the full path of the file. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Ids were the position of the function in the file, so adding a server function renumbered every later one. A client bundle from an earlier build then called a different function instead of failing. - Build the id from the names the function is nested under, such as `Page.load`. Functions that share a name path are numbered. - Keep production ids opaque by hashing that name. - Drop `get-descriptive-name.ts`, which nothing uses now. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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brenelz
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Sep 16, 2026
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A server function is moved to the top level of its module, and several shapes stop working once it is. They compiled without complaint before.
thisorargumentsin an arrow, usessuper, or reads a private class member..mtsand.ctsfiles.