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import type { PluginListResponse } from "@dispatch/transport-contract";
import { describe, expect, it } from "vitest";
import {
decideFrontendLoads,
frontendCandidates,
type ImportedFrontendModule,
usablePluginIds,
} from "./load-diff.js";
import { FRONTEND_ABI_VERSION } from "./version.js";
const httpBase = "http://localhost:24203";
function listWith(
...rows: readonly {
readonly id: string;
readonly apiVersion?: string;
readonly bust?: string;
}[]
): PluginListResponse {
return {
loaded: rows.map((r) => ({
id: r.id,
name: r.id,
version: "1.0.0",
tier: "standard" as const,
trust: "local" as const,
locked: false,
dependsOn: [],
...(r.apiVersion === undefined
? {}
: { frontend: { apiVersion: r.apiVersion, entry: "frontend.js", bust: r.bust ?? "1" } }),
})),
disabledWithReason: [],
discovered: [],
missing: [],
};
}
describe("frontendCandidates", () => {
it("derives candidates from loaded ∧ frontend-declaring ∧ workspace-enabled rows", () => {
const candidates = frontendCandidates(
listWith(
{ id: "a", apiVersion: "^1", bust: "111" },
{ id: "no-fe" },
{ id: "b", apiVersion: "^1", bust: "222" },
),
{ workspaceId: "team-a", usableIds: new Set(["a", "b", "no-fe"]), httpBase },
);
expect(candidates).toEqual([
{
id: "a",
apiVersion: "^1",
url: `${httpBase}/plugins/a/frontend?workspace=team-a&v=111`,
},
{
id: "b",
apiVersion: "^1",
url: `${httpBase}/plugins/b/frontend?workspace=team-a&v=222`,
},
]);
});
it("excludes plugins disabled in the active workspace", () => {
const candidates = frontendCandidates(listWith({ id: "a", apiVersion: "^1" }), {
workspaceId: "team-a",
usableIds: new Set<string>(),
httpBase,
});
expect(candidates).toEqual([]);
});
it("URL-encodes the workspace and bust", () => {
const candidates = frontendCandidates(listWith({ id: "a", apiVersion: "^1", bust: "1 2" }), {
workspaceId: "team a",
usableIds: new Set(["a"]),
httpBase,
});
expect(candidates[0]?.url).toBe(`${httpBase}/plugins/a/frontend?workspace=team%20a&v=1%202`);
});
});
describe("usablePluginIds", () => {
it("mirrors isPluginUsable: core usable unless disabled, others enabled-only", () => {
const usable = usablePluginIds([
{ pluginId: "core-one", tier: "core", state: "undefined", loaded: true, locked: true },
{ pluginId: "core-off", tier: "core", state: "disabled", loaded: true, locked: true },
{ pluginId: "std-on", tier: "standard", state: "enabled", loaded: true, locked: false },
{ pluginId: "std-blank", tier: "standard", state: "undefined", loaded: true, locked: false },
{ pluginId: "prov-on", tier: "providers", state: "enabled", loaded: true, locked: false },
{ pluginId: "prov-off", tier: "providers", state: "disabled", loaded: true, locked: false },
]);
expect([...usable].sort()).toEqual(["core-one", "prov-on", "std-on"]);
});
});
describe("decideFrontendLoads — the load diff (boot / extensions-changed / workspace.set)", () => {
const c = (id: string, bust = "1"): { id: string; url: string; apiVersion: string } => ({
id,
url: `${httpBase}/plugins/${id}/frontend?workspace=w&v=${bust}`,
apiVersion: "^1",
});
it("boot: every desired candidate imports (nothing imported yet)", () => {
const d = decideFrontendLoads([c("a"), c("b")], new Map());
expect(d.toLoad.map((x) => x.id)).toEqual(["a", "b"]);
expect(d.toUnload).toEqual([]);
expect(d.incompatible).toEqual([]);
});
it("extensions-changed: a removed plugin unloads, a newcomer imports", () => {
const imported = new Map<string, ImportedFrontendModule>([
["a", { url: c("a").url }],
["gone", { url: `${httpBase}/plugins/gone/frontend?workspace=w&v=1` }],
]);
const d = decideFrontendLoads([c("a"), c("new")], imported);
expect(d.toLoad.map((x) => x.id)).toEqual(["new"]);
expect(d.toUnload).toEqual(["gone"]);
});
it("workspace.set: the enablement set change drives load AND unload", () => {
// The candidate list already reflects the NEW workspace (composition
// root re-derives per sync) — previously-imported ids absent from it unload.
const imported = new Map<string, ImportedFrontendModule>([
["a", { url: c("a").url }],
["b", { url: c("b").url }],
]);
const d = decideFrontendLoads([c("a")], imported);
expect(d.toLoad).toEqual([]);
expect(d.toUnload).toEqual(["b"]);
});
it("a stable desired set is a no-op (idempotent sync)", () => {
const imported = new Map<string, ImportedFrontendModule>([
["a", { url: c("a").url }],
["b", { url: c("b").url }],
]);
const d = decideFrontendLoads([c("a"), c("b")], imported);
expect(d.toLoad).toEqual([]);
expect(d.toUnload).toEqual([]);
});
it("a changed URL (backend reload → new bust) is unload + re-import", () => {
const imported = new Map<string, ImportedFrontendModule>([["a", { url: c("a", "old").url }]]);
const d = decideFrontendLoads([c("a", "new")], imported);
expect(d.toLoad.map((x) => x.id)).toEqual(["a"]);
expect(d.toUnload).toEqual(["a"]);
});
it("handshake failure → incompatible, never imported, still unloaded if it was", () => {
const bad = { ...c("bad"), apiVersion: "^2" };
const imported = new Map<string, ImportedFrontendModule>([["bad", { url: bad.url }]]);
const d = decideFrontendLoads([bad], imported);
expect(d.toLoad).toEqual([]);
expect(d.incompatible).toEqual([{ id: "bad", apiVersion: "^2" }]);
// The previously-imported instance must be swept (the manifest changed
// under us — the UI must not keep running incompatible code).
expect(d.toUnload).toEqual(["bad"]);
});
it("the handshake checks against FRONTEND_ABI_VERSION", () => {
// A range that includes the host version passes — proving the version
// constant feeds the check.
expect(FRONTEND_ABI_VERSION).toBe("1.1");
const d = decideFrontendLoads([c("ok")], new Map());
expect(d.incompatible).toEqual([]);
});
it("the additive bump keeps v1 plugins loading (plan 04: ^1 spans 1.1)", () => {
// c() declares apiVersion "^1" — a bare-major range is a
// major-compatibility claim, so the 1.1 host (layout member added) still
// loads every v1 plugin.
const d = decideFrontendLoads([c("v1-plugin")], new Map());
expect(d.toLoad.map((x) => x.id)).toEqual(["v1-plugin"]);
expect(d.incompatible).toEqual([]);
});
it("plugins requiring the 1.1 ABI (^1.1) load on the 1.1 host", () => {
const layout = { ...c("layout-plugin"), apiVersion: "^1.1" };
const d = decideFrontendLoads([layout], new Map());
expect(d.toLoad.map((x) => x.id)).toEqual(["layout-plugin"]);
expect(d.incompatible).toEqual([]);
});
});
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