import { ProjectPluginStructure } from '@teleporthq/teleport-types';
/**
 * Simple A/B tests (Growth 2.0, spec item 26).
 *
 * An experiment is two SIBLING elements in a page: variant A (the original)
 * and variant B (its copy, edited by the owner), both carrying
 * `data-tq-exp="<id>"` and `data-tq-exp-variant="a"|"b"`. The editor derives
 * the experiment list from those attributes — nothing else is stored — and
 * so does this generator.
 *
 * Both variants are rendered; a tiny inline script in `<head>` picks the
 * visitor's arm BEFORE the body is parsed and hides the other one with a
 * style rule, so there is no flash of two heroes. The rule also hides that
 * element's descendants: a component instance is a `display: contents`
 * wrapper, and `display: none` on the wrapper alone is not enough in every
 * browser. The arm is kept in
 * `localStorage` (`tq_exp:<id>`), so a returning visitor sees the same page;
 * with cookie consent it is derived from the analytics visitor id, so the
 * assignment also survives a cleared key. Only localStorage, no cookies, no
 * cross-site identifier (spec §12).
 *
 * The script publishes `window.__tpExp = { <id>: 'a'|'b' }` for every
 * experiment in the project, each assigned on its own. The tracker stamps
 * `exp` only for tests whose element the visitor has seen (and keeps that
 * arm on later pages, so a checkout still counts for the hero that led
 * there). Analytics → Experiments reads one result per id.
 */
export declare const EXPERIMENT_ATTR = "data-tq-exp";
export declare const EXPERIMENT_VARIANT_ATTR = "data-tq-exp-variant";
export declare const EXPERIMENT_STORAGE_PREFIX = "tq_exp:";
/** Every experiment id a page or component of the project declares, sorted, unique. */
export declare function collectExperimentIds(uidl: ProjectPluginStructure['uidl']): string[];
/**
 * The assignment script. Kept small (well under 1 KB) and dependency-free:
 * it runs in `<head>` of every page, before any bundle. `E` is the list of
 * experiment ids baked in at generation.
 *
 * Arm choice: the stored arm; else, with consent and a visitor id, the parity
 * of a 32-bit FNV-1a hash of `<visitorId>|<id>` (stable per visitor and per
 * experiment — the same person is not always "a"); else a coin flip. Either
 * way the arm is stored and reused.
 */
export declare function buildExperimentAssignmentScript(ids: string[]): string;
/** The `<script>` tag for the project's `customCode.head`; empty without experiments. */
export declare function buildExperimentHeadSnippet(ids: string[]): string;
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