Function propagateLinearResult

lib/NormalModule.js:362–387

(ancestors, state, moduleGraph, ctx)

 * @returns {ConnectionState} the root ancestor's result
 */
const propagateLinearResult = (ancestors, state, moduleGraph, ctx) => {
	if (ancestors === null) return state;
	while (ancestors.length > 0) {
		const dep = /** @type {Dependency} */ (ancestors.pop());
		const ancestor = /** @type {NormalModule} */ (ancestors.pop());
		ancestor._isEvaluatingSideEffects = false;

		if (state === true) {
			recordSideEffectsBailout(ancestor, moduleGraph, dep);
			// `true` is monotonic — safe to cache regardless of cycle status.
			ancestor._sideEffectsStateGraph = moduleGraph;
			ancestor._sideEffectsStateValue = true;
		} else if (state === ModuleGraphConnection.CIRCULAR_CONNECTION) {
			// CIRCULAR_CONNECTION is filtered before folding into `current`,
			// so the ancestor's `current` stays at its initial `false`. From
			// this point upward the propagated state is `false`, and the
			// cycle taint prevents memoization further up (handled by
			// `ctx.circular`).
			state = false;
		} else if (!ctx.circular) {
			ancestor._sideEffectsStateGraph = moduleGraph;
			ancestor._sideEffectsStateValue = state;
		}
	}
	return state;
};

/**
 * Recursive form of the side-effects walker. Folds the descent through