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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
import {
getResourcePair,
getResourceValues,
type ResourceState,
type Id,
type ResourceBound,
type ResourceIdentity
} from "./core";
export type ResourceMap<R: ResourceBound, Mapped> = (
R,
ResourceIdentity
) => Mapped;
export function hasResource<R: ResourceBound>(
state: ResourceState<R>,
id: Id<R>
): boolean %checks {
return !!getResourcePair(state, id);
}
export function getResourceIds<R: ResourceBound>(
state: ResourceState<R>
): Array<Id<R>> {
return Object.keys(getResourceValues(state));
}
export function getResource<R: ResourceBound>(
state: ResourceState<R>,
id: Id<R>
): R {
const pair = getResourcePair(state, id);
if (!pair) {
throw new Error(`Resource ${id} does not exist`);
}
return pair.value;
}
export function getMappedResource<R: ResourceBound, Mapped>(
state: ResourceState<R>,
id: Id<R>,
map: ResourceMap<R, Mapped>
): Mapped {
const pair = getResourcePair(state, id);
if (!pair) {
throw new Error(`Resource ${id} does not exist`);
}
return map(pair.value, pair.identity);
}