/**
 * Tiny template renderer for linkAuth rewrite + header templates.
 *
 * Syntax (strict, no escapes, no nesting):
 *   - `${name}`              → context[name]
 *   - `${transform(name)}`   → applyTransform(transform, context[name])
 *
 * Anything else inside `${...}` throws `TemplateSyntaxError`. Missing context
 * keys throw `TemplateMissingVarError`. Unknown transform names propagate
 * `UnknownTransformError` from the transforms allowlist.
 *
 * This is NOT the project's general-purpose Handlebars renderer
 * (`utils/template.ts`) — that one is `{{...}}` and consumed widely. linkAuth
 * needs different syntax and a closed transform set; the two coexist by
 * namespace (`link-auth/template.ts`).
 */
/**
 * Thrown when a template references a variable not present in the context.
 * Message names the missing variable and includes the full template for
 * caller-side debugging.
 */
export declare class TemplateMissingVarError extends Error {
    constructor(varName: string, template: string);
}
/**
 * Thrown when a template contains syntactically invalid content inside `${...}`
 * (empty expression, whitespace, unrecognized form) or an unterminated `${`.
 */
export declare class TemplateSyntaxError extends Error {
    constructor(detail: string, template: string);
}
/**
 * Render a template by substituting `${...}` expressions from a context map.
 *
 * @throws {TemplateMissingVarError} if a referenced variable is absent
 * @throws {TemplateSyntaxError} for invalid expressions or unterminated `${`
 * @throws {UnknownTransformError} from a `${transform(name)}` call
 */
export declare function renderTemplate(template: string, context: Record<string, string>): string;
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