fix: disable top level await

[FrederikBolding]

Disables experiments.topLevelAwait in the Webpack config. This was enabled by default in Webpack 5.83.0, but is unsupported in Snaps.

With this flag disabled, trying to build a Snap with top level await will result in:

  • Module parse failed: The top-level-await experiment is not enabled (set experiments.topLevelAwait: true to enable it)
    File was processed with these loaders:
     * ../../node_modules/swc-loader/src/index.js
    You may need an additional loader to handle the result of these loaders.
    Error: The top-level-await experiment is not enabled (set experiments.topLevelAwait: true to enable it)
        at .../node_modules/webpack/lib/dependencies/HarmonyDetectionParserPlugin.js:68:11
        at Hook.eval [as call] (eval at create (.../node_modules/tapable/lib/HookCodeFactory.js:19:10), <anonymous>:7:16)
        at Hook.CALL_DELEGATE [as _call] (.../node_modules/tapable/lib/Hook.js:14:14)
        at JavascriptParser.walkAwaitExpression (.../node_modules/webpack/lib/javascript/JavascriptParser.js:2893:29)
        at JavascriptParser.walkExpression (.../node_modules/webpack/lib/javascript/JavascriptParser.js:2820:10)
        at JavascriptParser.walkLeftRightExpression (.../node_modules/webpack/lib/javascript/JavascriptParser.js:3061:8)
        at JavascriptParser.walkLogicalExpression (.../node_modules/webpack/lib/javascript/JavascriptParser.js:3080:9)
        at JavascriptParser.walkExpression (.../node_modules/webpack/lib/javascript/JavascriptParser.js:2847:10)
        at JavascriptParser.walkVariableDeclaration (.../node_modules/webpack/lib/javascript/JavascriptParser.js:2638:33)
        at JavascriptParser.walkStatement (.../node_modules/webpack/lib/javascript/JavascriptParser.js:1930:10)

Previously the Snap would build successfully but fail running in the client.

[Mrtenz]

Can you make a ticket about looking into improving the error message?

[FrederikBolding]

#2359