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Merged
nodejs-github-bot merged 2 commits into from
Apr 19, 2024
Merged

esm: drop support for import assertions #52104

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esm: drop support for import assertions
nicolo-ribaudo Mar 15, 2024
8c98666
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nicolo-ribaudo Apr 18, 2024
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esm: drop support for import assertions 
This patch removes support for the `assert` keyword
for import attributes. It was an old variant of the
proposal that was only shipped in V8 and no other
engine, and that has then been replaced by the `with`
keyword.

Chrome is planning to remove support for `assert`
in version 126, which will be released in June.

Node.js already supports the `with` keyword for
import attributes, and this patch does not change that.
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@nicolo-ribaudo
nicolo-ribaudo committed Mar 16, 2024
commit 4c227bde6d3bac5fb9b52b58f00748a56d7f5c0b
9 changes: 3 additions & 6 deletions src/node.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -796,19 +796,16 @@ static ExitCode ProcessGlobalArgsInternal(std::vector<std::string>* args,
return ExitCode::kInvalidCommandLineArgument2;
}

// TODO(aduh95): remove this when the harmony-import-assertions flag
// is removed in V8.
if (std::find(v8_args.begin(), v8_args.end(),
"--no-harmony-import-assertions") == v8_args.end()) {
v8_args.emplace_back("--harmony-import-assertions");
}
// TODO(aduh95): remove this when the harmony-import-attributes flag
// is removed in V8.
if (std::find(v8_args.begin(),
v8_args.end(),
"--no-harmony-import-attributes") == v8_args.end()) {
v8_args.emplace_back("--harmony-import-attributes");
}
// TODO(nicolo-ribaudo): remove this once V8 doesn't enable it by default
// anymore.
v8_args.emplace_back("--no-harmony-import-assertions");

auto env_opts = per_process::cli_options->per_isolate->per_env;
if (std::find(v8_args.begin(), v8_args.end(),
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10 changes: 10 additions & 0 deletions test/es-module/test-esm-import-attributes-errors.js
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Expand Up @@ -55,6 +55,16 @@ async function test() {
import(jsonModuleDataUrl, { with: { type: 'unsupported' } }),
{ code: 'ERR_IMPORT_ATTRIBUTE_UNSUPPORTED' }
);

await rejects(
import(jsonModuleDataUrl, { assert: { type: 'json' } }),
{ code: 'ERR_IMPORT_ATTRIBUTE_MISSING' }
);

await rejects(
import(`data:text/javascript,import${JSON.stringify(jsonModuleDataUrl)}assert{type:"json"}`),
SyntaxError
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@nicolo-ribaudo nicolo-ribaudo Mar 16, 2024

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This currently throws "unexpected token 'assert" -- I submitted a patch to V8 to make the error explicitly recommend to use 'with' instead: https://chromium-review.googlesource.com/c/v8/v8/+/5376260

);
}

test().then(common.mustCall());
10 changes: 10 additions & 0 deletions test/es-module/test-esm-import-attributes-errors.mjs
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Expand Up @@ -50,3 +50,13 @@ await rejects(
import(jsonModuleDataUrl, { with: { type: 'unsupported' } }),
{ code: 'ERR_IMPORT_ATTRIBUTE_UNSUPPORTED' }
);

await rejects(
import(jsonModuleDataUrl, { assert: { type: 'json' } }),
{ code: 'ERR_IMPORT_ATTRIBUTE_MISSING' }
);

await rejects(
import(`data:text/javascript,import${JSON.stringify(jsonModuleDataUrl)}assert{type:"json"}`),
SyntaxError
);