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feat: support stripping unused assets #232

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Merged
opera-eadelhult merged 1 commit into from
Aug 10, 2026
Merged

feat: support stripping unused assets #232

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17 changes: 17 additions & 0 deletions src/gms2/use-gms2.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -278,6 +278,21 @@ async function createLocalSettings(
return userDir;
}

// GMAssetCompiler ignores some project options unless the matching feature flag is on.
const ASSET_COMPILER_FEATURE_FLAGS = ["strip_unused_assets"];

/**
* Igor obfuscates the flag list before passing it as `/ffe=`: the comma
* separated list as UTF-8, every byte shifted by 10, then base64.
*/
function encodeFeatureFlags(flags: string[]): string {
const bytes = Buffer.from(flags.join(","), "utf-8");
for (const [i, byte] of bytes.entries()) {
bytes[i] = byte + 10;
}
return bytes.toString("base64");
}

export interface CommonIgorBuildArgs {
igorPath: string;
licenseFile: string;
Expand Down Expand Up @@ -327,6 +342,8 @@ export function constructIgorBuildArgs(
...(commonArgs.verbose ? ["-v"] : []),
"-projectool",
commonArgs.projectToolPath,
"-ac",
`/ffe=${encodeFeatureFlags(ASSET_COMPILER_FEATURE_FLAGS)}`,
"-jsonErrors",
...(commonArgs.userDir ? ["-uf", commonArgs.userDir] : []),
...(commonArgs.config ? ["-config", commonArgs.config] : []),
Expand Down
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