17 lines
757 B
TypeScript
17 lines
757 B
TypeScript
/** Snapshot caller-selected variables using Node child-process key semantics. */
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export const snapshotEnvironment = (
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environment: Readonly<NodeJS.ProcessEnv>,
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platform: NodeJS.Platform = process.platform,
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): Readonly<NodeJS.ProcessEnv> => {
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if (platform !== "win32") return Object.freeze({ ...environment });
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const snapshot: NodeJS.ProcessEnv = {};
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// Node sorts keys lexicographically and forwards the first case-insensitive
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// match on Windows. Canonical keys also make subsequent lookups deterministic.
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for (const key of Object.keys(environment).sort()) {
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const canonicalKey = key.toUpperCase();
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if (!Object.hasOwn(snapshot, canonicalKey))
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snapshot[canonicalKey] = environment[key];
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}
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return Object.freeze(snapshot);
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};
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