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unflag Top-Level Await · nodejs/node@62bb2e7 · GitHub

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 @@ -239,16 +239,6 @@ the ability to import a directory that has an index file.

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 Please see [customizing ESM specifier resolution][] for example usage.

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 ### `--experimental-top-level-await`

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 <!-- YAML

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 added: v14.3.0

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 -->

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 Enable experimental top-level `await` keyword support, available only in ES

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 module scripts.

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 (See also `--experimental-repl-await`.)

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 ### `--experimental-vm-modules`

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 <!-- YAML

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 added: v9.6.0

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 @@ -1146,9 +1146,8 @@ would provide the exports interface for the instantiation of `module.wasm`.

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 ## Experimental top-level `await`

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 When the `--experimental-top-level-await` flag is provided, `await` may be used

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 in the top level (outside of async functions) within modules. This implements

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 the [ECMAScript Top-Level `await` proposal][].

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 The `await` keyword may be used in the top level (outside of async functions)

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 within modules as per the [ECMAScript Top-Level `await` proposal][].

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 Assuming an `a.mjs` with

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 @@ -1166,8 +1165,7 @@ console.log(five); // Logs `5`

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```

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 ```bash

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 node b.mjs # fails

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 node --experimental-top-level-await b.mjs # works

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 node b.mjs # works

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```

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 ## Experimental loaders

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 @@ -157,9 +157,6 @@ keyword support in REPL.

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 .It Fl -experimental-specifier-resolution

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 Select extension resolution algorithm for ES Modules; either 'explicit' (default) or 'node'

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 .It Fl -experimental-top-level-await

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 Enable experimental top-level await support in ES modules.

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 .

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 .It Fl -experimental-vm-modules

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 Enable experimental ES module support in VM module.

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 @@ -779,6 +779,13 @@ int ProcessGlobalArgs(std::vector<std::string>* args,

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 return 12;

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 // TODO(mylesborins): remove this when the harmony-top-level-await flag

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 // is removed in V8

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 if (std::find(v8_args.begin(), v8_args.end(),

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 "--no-harmony-top-level-await") == v8_args.end()) {

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 v8_args.push_back("--harmony-top-level-await");

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 }

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 auto env_opts = per_process::cli_options->per_isolate->per_env;

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 if (std::find(v8_args.begin(), v8_args.end(),

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 "--abort-on-uncaught-exception") != v8_args.end() ||

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 @@ -613,12 +613,13 @@ PerIsolateOptionsParser::PerIsolateOptionsParser(

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 Implies("--report-signal", "--report-on-signal");

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 AddOption("--experimental-top-level-await",

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 "enable experimental support for ECMAScript Top-Level Await",

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 "",

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 &PerIsolateOptions::experimental_top_level_await,

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 kAllowedInEnvironment);

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 AddOption("--harmony-top-level-await", "", V8Option{});

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 Implies("--experimental-top-level-await", "--harmony-top-level-await");

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 Implies("--harmony-top-level-await", "--experimental-top-level-await");

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 ImpliesNot("--no-harmony-top-level-await", "--experimental-top-level-await");

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 Insert(eop, &PerIsolateOptions::get_per_env_options);

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 @@ -188,7 +188,7 @@ class PerIsolateOptions : public Options {

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 bool no_node_snapshot = false;

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 bool report_uncaught_exception = false;

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 bool report_on_signal = false;

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 bool experimental_top_level_await = false;

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 bool experimental_top_level_await = true;

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 std::string report_signal = "SIGUSR2";

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 inline EnvironmentOptions* get_per_env_options();

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 void CheckOptions(std::vector<std::string>* errors) override;

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 @@ -1,5 +1,3 @@

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 // Flags: --experimental-top-level-await

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 import '../common/index.mjs';

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 import fixtures from '../common/fixtures.js';

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 import assert from 'assert';

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 @@ -1,2 +1,4 @@

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 // Flags: --no-harmony-top-level-await

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 'use strict';

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 await async () => 0;

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 @@ -1,4 +1,4 @@

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 file:///*/test/message/esm_display_syntax_error.mjs:2

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 file:///*/test/message/esm_display_syntax_error.mjs:4

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 await async () => 0;

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 ^^^^^

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 @@ -1,6 +1,6 @@

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 file:///*/test/fixtures/es-module-loaders/syntax-error.mjs:2

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 await async () => 0;

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 ^^^^^

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 ^^^^^^^^^^^^^

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 SyntaxError: Unexpected reserved word

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 SyntaxError: Malformed arrow function parameter list

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 at Loader.moduleStrategy (internal/modules/esm/translators.js:*:*)

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