tmu
45495fe2a8
Extend the matcher universe beyond string | number so a union can carry boolean, null and undefined members. true|false, null and undefined are not property keys, so handler keys are their stringification while the callback still receives the real member. Symbols are rejected (a brand is compile-time only) and bigint is not a property key.
697 lines
21 KiB
TypeScript
697 lines
21 KiB
TypeScript
/* oxlint-disable typescript/no-floating-promises -- expectTypeOf() is a sync type-assertion library that the type-aware linter misidentifies as a promise */
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import { strict as assert } from "node:assert";
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import path from "node:path";
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import { test } from "node:test";
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import { expectTypeOf } from "expect-type";
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import {
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type CompletionTarget,
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LspSession,
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} from "#test-utils/lsp-completion.ts";
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import { getMatcher, getMatcherW } from "./primitive.ts";
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// ============================================================================
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// API: getMatcher — ✔️ Exhaustive / ✔️ ReturnsStrict
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// ============================================================================
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test("getMatcher: exhaustive pattern infers one common return type", () => {
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// Arrange
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const factory = getMatcher<"a" | "b">();
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// Act
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const matcher = factory({
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return 1;
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},
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b: (s) => {
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expectTypeOf(s).toEqualTypeOf<"b">();
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return 2;
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},
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});
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// Assert
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// ✔️ ReturnsStrict: R is the best common return type, not a widening union.
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expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b") => number>();
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// ❌ a value outside T must not be accepted by the matcher
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expectTypeOf<"c">().not.toExtend<Parameters<typeof matcher>[0]>();
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assert.equal(matcher("a"), 1);
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assert.equal(matcher("b"), 2);
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});
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test("getMatcher: dispatches on numeric literal keys", () => {
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// Arrange
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const factory = getMatcher<1 | 2>();
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// Act
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const matcher = factory({
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1: (n) => {
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expectTypeOf(n).toEqualTypeOf<1>();
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return n + 1;
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},
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2: (n) => {
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expectTypeOf(n).toEqualTypeOf<2>();
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return n * 10;
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},
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: 1 | 2) => number>();
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assert.equal(matcher(1), 2);
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assert.equal(matcher(2), 20);
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});
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test("getMatcher: dispatches on mixed string and numeric keys", () => {
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// Arrange
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const factory = getMatcher<"a" | "b" | 1 | 2>();
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// Act
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const matcher = factory({
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return 1;
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},
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b: (s) => {
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expectTypeOf(s).toEqualTypeOf<"b">();
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return 2;
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},
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1: (n) => {
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expectTypeOf(n).toEqualTypeOf<1>();
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return 10;
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},
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2: (n) => {
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expectTypeOf(n).toEqualTypeOf<2>();
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return 20;
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},
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b" | 1 | 2) => number>();
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assert.equal(matcher("a"), 1);
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assert.equal(matcher("b"), 2);
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assert.equal(matcher(1), 10);
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assert.equal(matcher(2), 20);
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});
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test("getMatcher: dispatches on boolean literals", () => {
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// Arrange
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const factory = getMatcher<boolean>();
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// Act
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const matcher = factory({
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true: (s) => {
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expectTypeOf(s).toEqualTypeOf<true>();
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return 1;
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},
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false: (s) => {
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expectTypeOf(s).toEqualTypeOf<false>();
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return 2;
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},
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: boolean) => number>();
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assert.equal(matcher(true), 1);
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assert.equal(matcher(false), 2);
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});
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test("getMatcher: dispatches on null and undefined", () => {
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// Arrange
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const factory = getMatcher<null | undefined>();
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// Act
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const matcher = factory({
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null: (s) => {
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expectTypeOf(s).toEqualTypeOf<null>();
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return "null";
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},
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undefined: (s) => {
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expectTypeOf(s).toEqualTypeOf<undefined>();
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return "undefined";
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},
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: null | undefined) => string>();
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assert.equal(matcher(null), "null");
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assert.equal(matcher(undefined), "undefined");
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});
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// ============================================================================
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// API: getMatcher — ❌ Exhaustive (fallback) / ✔️ ReturnsStrict
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// ============================================================================
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test("getMatcher: a `_` fallback receives the unhandled keys", () => {
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// Arrange
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const factory = getMatcher<"a" | "b" | "c">();
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// Act
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const matcher = factory(
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{
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return 1 as const;
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},
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},
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(s) => {
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// The fallback sees only the keys `a` did not handle.
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expectTypeOf(s).toEqualTypeOf<"b" | "c">();
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return 2 as const;
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},
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);
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b" | "c") => 1 | 2>();
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// ❌ a value outside T must not be accepted by the matcher
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expectTypeOf<"d">().not.toExtend<Parameters<typeof matcher>[0]>();
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assert.equal(matcher("a"), 1);
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assert.equal(matcher("b"), 2);
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assert.equal(matcher("c"), 2);
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});
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test("getMatcher: a `_` fallback routes mixed string and numeric gaps", () => {
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// Arrange
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const factory = getMatcher<"a" | "b" | 1 | 2>();
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// Act
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const matcher = factory(
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{
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return "A";
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},
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1: (n) => {
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expectTypeOf(n).toEqualTypeOf<1>();
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return "one";
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},
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},
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(s) => {
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expectTypeOf(s).toEqualTypeOf<"b" | 2>();
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return "fallback";
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},
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);
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b" | 1 | 2) => string>();
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assert.equal(matcher("a"), "A");
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assert.equal(matcher("b"), "fallback");
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assert.equal(matcher(1), "one");
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assert.equal(matcher(2), "fallback");
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});
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test("getMatcher: a `_` fallback receives unhandled boolean and nullish keys", () => {
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// Arrange
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const factory = getMatcher<"a" | true | false | null | undefined>();
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// Act
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const matcher = factory(
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{
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return 1 as const;
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},
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null: (s) => {
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expectTypeOf(s).toEqualTypeOf<null>();
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return 2 as const;
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},
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},
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(s) => {
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// `true` and `false` are keyed as `"true"`/`"false"` but the
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// fallback still sees them as booleans.
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expectTypeOf(s).toEqualTypeOf<true | false | undefined>();
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return 3 as const;
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},
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);
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<
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(shape: "a" | true | false | null | undefined) => 1 | 2 | 3
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>();
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assert.equal(matcher("a"), 1);
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assert.equal(matcher(true), 3);
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assert.equal(matcher(false), 3);
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assert.equal(matcher(null), 2);
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assert.equal(matcher(undefined), 3);
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});
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// ============================================================================
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// API: getMatcherW — ✔️ Exhaustive / ❌ ReturnsStrict
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// ============================================================================
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test("getMatcherW: exhaustive pattern widens to the union of handler returns", () => {
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// Arrange
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const factory = getMatcherW<"x" | "y">();
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// Act
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const matcher = factory({
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x: (s) => {
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expectTypeOf(s).toEqualTypeOf<"x">();
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return 1 as const;
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},
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y: (s) => {
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expectTypeOf(s).toEqualTypeOf<"y">();
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return "two" as const;
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},
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});
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// Assert
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// ❌ ReturnsStrict: mixed handler returns widen to their union.
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expectTypeOf(matcher).toEqualTypeOf<(shape: "x" | "y") => 1 | "two">();
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// ❌ a value outside T must not be accepted by the matcher
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expectTypeOf<"z">().not.toExtend<Parameters<typeof matcher>[0]>();
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assert.equal(matcher("x"), 1);
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assert.equal(matcher("y"), "two");
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});
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test("getMatcherW: dispatches on mixed string and numeric keys", () => {
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// Arrange
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const factory = getMatcherW<"a" | "b" | 1 | 2>();
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// Act
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const matcher = factory({
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return "A" as const;
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},
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b: (s) => {
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expectTypeOf(s).toEqualTypeOf<"b">();
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return "B" as const;
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},
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1: (n) => {
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expectTypeOf(n).toEqualTypeOf<1>();
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return 10 as const;
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},
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2: (n) => {
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expectTypeOf(n).toEqualTypeOf<2>();
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return 20 as const;
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},
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<
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(shape: "a" | "b" | 1 | 2) => "A" | "B" | 10 | 20
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>();
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assert.equal(matcher("a"), "A");
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assert.equal(matcher("b"), "B");
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assert.equal(matcher(1), 10);
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assert.equal(matcher(2), 20);
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});
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test("getMatcherW: exhaustive boolean and nullish widen to the union", () => {
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// Arrange
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const factory = getMatcherW<boolean | null | undefined>();
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// Act
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const matcher = factory({
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true: (s) => {
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expectTypeOf(s).toEqualTypeOf<true>();
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return "yes" as const;
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},
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false: (s) => {
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expectTypeOf(s).toEqualTypeOf<false>();
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return "no" as const;
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},
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null: (s) => {
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expectTypeOf(s).toEqualTypeOf<null>();
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return 0 as const;
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},
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undefined: (s) => {
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expectTypeOf(s).toEqualTypeOf<undefined>();
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return 1 as const;
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},
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<
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(shape: boolean | null | undefined) => "yes" | "no" | 0 | 1
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>();
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assert.equal(matcher(true), "yes");
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assert.equal(matcher(false), "no");
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assert.equal(matcher(null), 0);
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assert.equal(matcher(undefined), 1);
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});
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// ============================================================================
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// API: getMatcherW — ❌ Exhaustive (fallback) / ❌ ReturnsStrict
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// ============================================================================
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test("getMatcherW: a `_` fallback widens gaps into the union", () => {
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// Arrange
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const factory = getMatcherW<"x" | "y" | "z">();
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// Act
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const matcher = factory(
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{
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x: (s) => {
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expectTypeOf(s).toEqualTypeOf<"x">();
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return 1 as const;
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},
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},
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(s) => {
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// The fallback sees only the keys `x` did not handle.
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expectTypeOf(s).toEqualTypeOf<"y" | "z">();
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return "fallback" as const;
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},
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);
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<
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(shape: "x" | "y" | "z") => 1 | "fallback"
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>();
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// ❌ a value outside T must not be accepted by the matcher
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expectTypeOf<"w">().not.toExtend<Parameters<typeof matcher>[0]>();
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assert.equal(matcher("x"), 1);
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assert.equal(matcher("y"), "fallback");
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assert.equal(matcher("z"), "fallback");
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});
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test("getMatcherW: a `_` fallback widens mixed string and numeric returns", () => {
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// Arrange
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const factory = getMatcherW<"a" | "b" | 1 | 2>();
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// Act
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const matcher = factory(
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{
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a: (s) => {
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expectTypeOf(s).toEqualTypeOf<"a">();
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return "A" as const;
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},
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1: (n) => {
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expectTypeOf(n).toEqualTypeOf<1>();
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return 10 as const;
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},
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},
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(s) => {
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expectTypeOf(s).toEqualTypeOf<"b" | 2>();
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return "fallback" as const;
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},
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);
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// Assert
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// ❌ ReturnsStrict: mixed handler returns widen to their union.
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expectTypeOf(matcher).toEqualTypeOf<
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(shape: "a" | "b" | 1 | 2) => "A" | 10 | "fallback"
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>();
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assert.equal(matcher("a"), "A");
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assert.equal(matcher("b"), "fallback");
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assert.equal(matcher(1), 10);
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assert.equal(matcher(2), "fallback");
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});
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// ============================================================================
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// Factory contracts — calls that must not compile
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// ============================================================================
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test("getMatcher factory rejects patterns outside its contract", () => {
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// Arrange
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const factory = getMatcher<"a" | "b">();
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// Act / Assert — the calls below must not compile.
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// `Parameters<typeof factory>[0]` resolves only the *last* overload, so it
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// is not a sound "rejected" oracle (an accepted partial pattern does not
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// extend it either); the call sites are the oracle instead.
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factory({
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a: () => 1,
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b: () => 2,
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// @ts-expect-error `c` is not part of the universe `"a" | "b"`
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c: () => 3,
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});
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// @ts-expect-error a gap without a `_` fallback is not exhaustive
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factory({ a: () => 1 });
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// @ts-expect-error a `string` fallback does not fit the `number` handler
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factory({ a: () => 1 }, () => "x");
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// @ts-expect-error a fallback is redundant once the map covers the universe
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factory({ a: () => 1, b: () => 2 }, () => 0);
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});
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test("getMatcher factory rejects non-exhaustive boolean and nullish maps", () => {
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// Arrange
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const factory = getMatcher<boolean | null | undefined>();
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// Act / Assert — the calls below must not compile
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// @ts-expect-error only `true` is handled; `false`, `null`, `undefined` are not
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factory({ true: () => 1 });
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// @ts-expect-error `null` and `undefined` are not handled
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factory({ true: () => 1, false: () => 2 });
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factory(
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// @ts-expect-error a fallback is redundant once the map covers the universe
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{
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true: () => 1,
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false: () => 2,
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null: () => 3,
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undefined: () => 4,
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},
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() => 0,
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);
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});
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test("getMatcher: an open universe keeps the fallback's remainder open", () => {
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// Arrange
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const factory = getMatcher<string>();
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// Act
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const matcher = factory({ a: () => 1 }, (s) => {
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// The map's literal keys do not close an open universe, so the
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// remainder stays `string` and the fallback is not redundant.
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expectTypeOf(s).toEqualTypeOf<string>();
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return 2 as const;
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});
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// Assert
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expectTypeOf(matcher).toEqualTypeOf<(shape: string) => number>();
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assert.equal(matcher("a"), 1);
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assert.equal(matcher("b"), 2);
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});
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test("getMatcherW factory rejects patterns outside its contract", () => {
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// Arrange
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const factory = getMatcherW<"x" | "y">();
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// Act / Assert — the calls below must not compile
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factory({
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x: () => 1 as const,
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y: () => 2 as const,
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// @ts-expect-error `z` is not part of the universe `"x" | "y"`
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z: () => 3 as const,
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});
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// @ts-expect-error a gap without a `_` fallback is not exhaustive
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factory({ x: () => 1 as const });
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// @ts-expect-error a fallback is redundant once the map covers the universe
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factory({ x: () => 1 as const, y: () => 2 as const }, () => 0);
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});
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// ============================================================================
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// Dispatch — runtime behavior
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// ============================================================================
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test("getMatcher: an unhandled shape throws without a fallback", () => {
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// Arrange — an open universe types its handler map as an index signature,
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// so the type system cannot prove the runtime map is exhaustive.
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const handlers: Record<string, () => number> = { a: () => 1 };
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const matcher = getMatcher<string>()(handlers);
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// Act / Assert
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assert.equal(matcher("a"), 1);
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assert.throws(() => matcher("b"), /Unhandled shape: b/);
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});
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test("getMatcher: an unhandled boolean shape throws without a fallback", () => {
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// Arrange — an `string | boolean` universe widens its handler map to an
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// index signature, so the runtime map's exhaustiveness is not provable.
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const handlers: Record<string, () => number> = { true: () => 1 };
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const matcher = getMatcher<string | boolean>()(handlers);
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// Act / Assert
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assert.equal(matcher(true), 1);
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assert.throws(() => matcher(false), /Unhandled shape: false/);
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});
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// ============================================================================
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// Autocomplete — the language server is the oracle, not the type system
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// ============================================================================
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// Completion is a contextual-type property that the type system cannot observe,
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// so the cases below read the popup from the repo's language server (via the
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// test helper) rather than pairing `expectTypeOf` with `assert` — see
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// development/testing.md § Autocomplete. They probe the *matcher's* overloads,
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// which is why they live with the matcher and not with the helper.
|
|
const REPO_ROOT = path.resolve(import.meta.dirname, "..");
|
|
const UNIVERSE = `"a" | "b" | "c"`;
|
|
|
|
// One session per probe: the tests share no language-server state (open
|
|
// documents, project membership), so they pass in any order.
|
|
interface LabelsProbe {
|
|
readonly name: string;
|
|
readonly factory: "getMatcher" | "getMatcherW";
|
|
readonly body: string;
|
|
readonly universe?: string;
|
|
readonly tail?: string;
|
|
}
|
|
|
|
const labelsFor = ({
|
|
name,
|
|
factory,
|
|
body,
|
|
universe = UNIVERSE,
|
|
tail = "",
|
|
}: LabelsProbe): Promise<readonly string[]> => {
|
|
const session = new LspSession(REPO_ROOT);
|
|
const target: CompletionTarget = {
|
|
file: `src/__autocomplete_${name}.ts`,
|
|
source: [
|
|
`import { ${factory} } from "./index.ts";`,
|
|
`const m = ${factory}<${universe}>()({`,
|
|
body,
|
|
`}${tail});`,
|
|
"",
|
|
].join("\n"),
|
|
};
|
|
return session
|
|
.completionLabelsAt(target)
|
|
.then((result) => result.labels)
|
|
.finally(() => session.close());
|
|
};
|
|
|
|
test("autocomplete: an exhaustive pattern requires the universe", () => {
|
|
// Arrange
|
|
const name = "getMatcher_fresh";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcher",
|
|
body: " /*COMPLETE*/",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["a", "b", "c"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: handled keys drop out of the popup", () => {
|
|
// Arrange
|
|
const name = "getMatcher_after_key";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcher",
|
|
body: " a: () => 1,\n /*COMPLETE*/",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["b", "c"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: a fallback makes the remaining keys optional", () => {
|
|
// Arrange
|
|
const name = "getMatcher_with_fallback";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcher",
|
|
body: " /*COMPLETE*/",
|
|
tail: ", () => 0",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["a?", "b?", "c?"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: with a fallback, handled keys stay optional", () => {
|
|
// Arrange
|
|
const name = "getMatcher_with_fallback_after_key";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcher",
|
|
body: " a: () => 1,\n /*COMPLETE*/",
|
|
tail: ", () => 0",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["b?", "c?"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: `getMatcherW` offers the same popup as `getMatcher`", () => {
|
|
// Arrange
|
|
const name = "getMatcherW_fresh";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcherW",
|
|
body: " /*COMPLETE*/",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["a", "b", "c"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: `getMatcherW` also offers optional keys with a fallback", () => {
|
|
// Arrange
|
|
const name = "getMatcherW_with_fallback";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcherW",
|
|
body: " /*COMPLETE*/",
|
|
tail: ", () => 0",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["a?", "b?", "c?"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: boolean and nullish keys are offered by name", () => {
|
|
// Arrange
|
|
const name = "getMatcher_boolean_nullish";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcher",
|
|
universe: "boolean | null | undefined",
|
|
body: " /*COMPLETE*/",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["false", "null", "true", "undefined"]);
|
|
});
|
|
});
|
|
|
|
test("autocomplete: a handled boolean literal drops out of the popup", () => {
|
|
// Arrange
|
|
const name = "getMatcher_boolean_after_key";
|
|
|
|
// Act
|
|
const labels = labelsFor({
|
|
name,
|
|
factory: "getMatcher",
|
|
universe: "boolean | null | undefined",
|
|
body: " true: () => 1,\n /*COMPLETE*/",
|
|
});
|
|
|
|
// Assert
|
|
return labels.then((result) => {
|
|
assert.deepEqual([...result], ["false", "null", "undefined"]);
|
|
});
|
|
});
|