/**
 * Windows variables that let an ordinary child find executables, the command
 * interpreter, system DLLs, its profile and temporary storage.
 *
 * This is a fragment rather than a complete inheritance policy. MCP stdio and
 * LocalSandbox have different ambient grants; both need this fragment on the
 * Windows paths that already promise to launch a working process.
 */
export declare const WINDOWS_CORE_ENV_KEYS: readonly string[];
type EnvironmentSource = Readonly<Record<string, string | undefined>>;
/** Read one environment entry using the host platform's key semantics. */
export declare function readEnvironmentEntry(source: EnvironmentSource, name: string, platform?: NodeJS.Platform): [name: string, value: string] | undefined;
/**
 * Set one entry, making a later override the sole spelling on Windows.
 *
 * JavaScript objects are case-sensitive; Windows environments are not. Without
 * removing the earlier spelling, `{ PATH, Path }` reaches Node's spawn layer
 * with two apparent winners and the configured precedence becomes accidental.
 */
export declare function setEnvironmentEntry(target: Record<string, string>, name: string, value: string, platform?: NodeJS.Platform): void;
/** Copy only the named ambient entries. */
export declare function pickEnvironmentEntries(names: Iterable<string>, source?: EnvironmentSource, platform?: NodeJS.Platform): Record<string, string>;
/** Apply explicit entries in insertion order; later calls therefore win. */
export declare function applyEnvironmentOverrides(target: Record<string, string>, overrides: EnvironmentSource | undefined, platform?: NodeJS.Platform): void;
export {};
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