/**
 * Environment truthiness check for the ported Ink core. Accepts the common
 * shell truthy spellings (`1`, `true`, `yes`, `on`).
 * @param value - The environment value to interpret.
 * @returns True for booleans `true` and the truthy spellings, false otherwise.
 */
export declare function isEnvTruthy(value: string | boolean | undefined | null): boolean;
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