Checkpoint web parity through Chromium input tasks

web/tests/unit/ime-composition.test.mjs

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+import assert from "node:assert/strict";
+import fs from "node:fs";
+import path from "node:path";
+import test from "node:test";
+import ts from "../../node_modules/typescript/lib/typescript.js";
+
+const root = path.resolve(import.meta.dirname, "../../..");
+const sourcePath = path.join(root, "web/protocol/ime-composition.ts");
+const output = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), { compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 }, fileName: sourcePath, reportDiagnostics: true });
+assert.deepEqual(output.diagnostics, []);
+const ime = await import(`data:text/javascript;base64,${Buffer.from(output.outputText).toString("base64")}`);
+
+test("M14-04D blocks operators through composition start/update and reopens after end", () => {
+  let state = ime.createIMECompositionState();
+  assert.equal(ime.shouldBlockOperatorShortcuts(state), false);
+  state = ime.reduceIMEComposition(state, { type: "compositionstart", data: "n" });
+  assert.equal(ime.shouldBlockOperatorShortcuts(state), true);
+  state = ime.reduceIMEComposition(state, { type: "compositionupdate", data: "ni" });
+  assert.deepEqual([state.composing, state.pendingText, state.lastEvent], [true, "ni", "UPDATE"]);
+  state = ime.reduceIMEComposition(state, { type: "compositionend", data: "你" });
+  assert.equal(ime.shouldBlockOperatorShortcuts(state), false);
+  assert.equal(ime.shouldBlockOperatorShortcuts(state, true), true);
+});
+
+test("M14-04D ignores stray updates and rejects malformed state", () => {
+  let state = ime.createIMECompositionState();
+  assert.equal(ime.reduceIMEComposition(state, { type: "compositionupdate", data: "x" }), state);
+  assert.throws(() => ime.shouldBlockOperatorShortcuts({ schemaVersion: 2 }), /IME_STATE_INVALID/);
+});