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GeezerVison is showing github.com — [SwiftBuild] PackageToJS plugin fails to generate correct js initializer code · Issue #796 · swiftwasm/JavaScriptKit

[SwiftBuild] PackageToJS plugin fails to generate correct js initializer code #796

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[SwiftBuild] PackageToJS plugin fails to generate correct js initializer code#796
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@sliemeobn
sliemeobn
opened on Aug 4, 2026
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for a browser / WASI use case this will result in an error like: "wasi_snapshot_preview1": module is not an object or function

because triple detection is based on the build output path:

JavaScriptKit/Plugins/PackageToJS/Sources/PackageToJS.swift

Lines 72 to 81 in e53155d

static func deriveBuildConfiguration(wasmProductArtifact: URL) -> (configuration: String, triple: String) {
// e.g. path/to/.build/wasm32-unknown-wasi/debug/Basic.wasm -> ("debug", "wasm32-unknown-wasi")
// First, resolve symlink to get the actual path as SwiftPM 6.0 and earlier returns unresolved
// symlink path for product artifact.
let wasmProductArtifact = wasmProductArtifact.resolvingSymlinksInPath()
let buildConfiguration = wasmProductArtifact.deletingLastPathComponent().lastPathComponent
let triple = wasmProductArtifact.deletingLastPathComponent().deletingLastPathComponent().lastPathComponent
return (buildConfiguration, triple)
}

and swift-build produces different out paths like this: .build/out/Products/Release-webassembly-wasm32/App.wasm

template variables like IS_WASI are no longer correctly derived

JavaScriptKit/Plugins/PackageToJS/Sources/PackageToJS.swift

Line 813 in e53155d

"IS_WASI": triple.hasPrefix("wasm32-unknown-wasi"),

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  1. sliemeobn commented on Aug 22, 2026

    @sliemeobn
    sliemeobn
    on Aug 22, 2026
    ContributorAuthor
    More actions

    fixed in #807

  2. sliemeobn
    closed this as completedon Aug 22, 2026
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