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LibJS: Infer file extensions when resolving module paths

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This allows `import "./foo"` to succeed, even if the file is actually
called `foo.js`. IDEs commonly exclude file extensions in auto-imports.

Closes #14364.
This commit is contained in:
Linus Groh 2022-06-26 21:00:55 +01:00
parent 2b3dd87296
commit 93b4c3bb82
3 changed files with 42 additions and 6 deletions
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42
Userland/Libraries/LibJS/Runtime/VM.cpp
View file

@ -823,6 +823,29 @@ ThrowCompletionOr<void> VM::link_and_eval_module(Module& module)
return {};
}
static String resolve_module_filename(StringView filename, StringView module_type)
{
auto extensions = Vector<StringView, 2> { "js"sv, "mjs"sv };
if (module_type == "json"sv)
extensions = { "json"sv };
if (!Core::File::exists(filename)) {
for (auto extension : extensions) {
// import "./foo" -> import "./foo.ext"
auto resolved_filepath = String::formatted("{}.{}", filename, extension);
if (Core::File::exists(resolved_filepath))
return resolved_filepath;
}
} else if (Core::File::is_directory(filename)) {
for (auto extension : extensions) {
// import "./foo" -> import "./foo/index.ext"
auto resolved_filepath = LexicalPath::join(filename, String::formatted("index.{}", extension)).string();
if (Core::File::exists(resolved_filepath))
return resolved_filepath;
}
}
return filename;
}
// 16.2.1.7 HostResolveImportedModule ( referencingScriptOrModule, specifier ), https://tc39.es/ecma262/#sec-hostresolveimportedmodule
ThrowCompletionOr<NonnullRefPtr<Module>> VM::resolve_imported_module(ScriptOrModule referencing_script_or_module, ModuleRequest const& module_request)
{
@ -840,6 +863,12 @@ ThrowCompletionOr<NonnullRefPtr<Module>> VM::resolve_imported_module(ScriptOrMod
// The actual mapping semantic is host-defined but typically a normalization process is applied to specifier as part of the mapping process.
// A typical normalization process would include actions such as alphabetic case folding and expansion of relative and abbreviated path specifiers.
// We only allow "type" as a supported assertion so it is the only valid key that should ever arrive here.
VERIFY(module_request.assertions.is_empty() || (module_request.assertions.size() == 1 && module_request.assertions.first().key == "type"));
auto module_type = module_request.assertions.is_empty() ? String {} : module_request.assertions.first().value;
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] module at {} has type {} [is_null={}]", module_request.module_specifier, module_type, module_type.is_null());
StringView base_filename = referencing_script_or_module.visit(
[&](Empty) {
return "."sv;
@ -851,6 +880,13 @@ ThrowCompletionOr<NonnullRefPtr<Module>> VM::resolve_imported_module(ScriptOrMod
LexicalPath base_path { base_filename };
auto filename = LexicalPath::absolute_path(base_path.dirname(), module_request.module_specifier);
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] base path: '{}'", base_path);
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] initial filename: '{}'", filename);
filename = resolve_module_filename(filename, module_type);
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] resolved filename: '{}'", filename);
#if JS_MODULE_DEBUG
String referencing_module_string = referencing_script_or_module.visit(
[&](Empty) -> String {
@ -867,12 +903,6 @@ ThrowCompletionOr<NonnullRefPtr<Module>> VM::resolve_imported_module(ScriptOrMod
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] resolved {} + {} -> {}", base_path, module_request.module_specifier, filename);
#endif
// We only allow "type" as a supported assertion so it is the only valid key that should ever arrive here.
VERIFY(module_request.assertions.is_empty() || (module_request.assertions.size() == 1 && module_request.assertions.first().key == "type"));
auto module_type = module_request.assertions.is_empty() ? String {} : module_request.assertions.first().value;
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] module at {} has type {} [is_null={}]", module_request.module_specifier, module_type, module_type.is_null());
auto* loaded_module_or_end = get_stored_module(referencing_script_or_module, filename, module_type);
if (loaded_module_or_end != nullptr) {
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] resolve_imported_module({}) already loaded at {}", filename, loaded_module_or_end->module.ptr());