chore: bumped minimum TypeScript version to 4.3 (#207)

## PR Checklist

- [x] Addresses an existing open issue: fixes #206
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/ts-api-utils/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/ts-api-utils/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Raises the lowest tested version to 4.3 and removes code that supports
earlier versions (i.e. 4.2). Bumps the version to ~0.1.0~ 0.2.0
accordingly.

---------

Co-authored-by: Rebecca Stevens <rebecca.stevens@outlook.co.nz>

.github/actions/protect-main/action.yml

@@ -44,13 +44,13 @@ runs:
                   { context: "packages" },
                   { context: "prettier" },
                   { context: "spelling" },
-                  { context: "test (16.13.0, 4.2.4)" },
                   { context: "test (16.13.0, 4.3.5)" },
-                  { context: "test (16.13.0, 4.4.4)" },
+                  { context: "test (16.13.0, 4.6.4)" },
+                  { context: "test (16.13.0, 4.9.5)" },
                   { context: "test (16.13.0, latest)" },
-                  { context: "test (18.x, 4.2.4)" },
                   { context: "test (18.x, 4.3.5)" },
-                  { context: "test (18.x, 4.4.4)" },
+                  { context: "test (18.x, 4.6.4)" },
+                  { context: "test (18.x, 4.9.5)" },
                   { context: "test (18.x, latest)" },
                   { context: "type-check" },
                 ],

.github/workflows/test.yml

@@ -13,13 +13,13 @@ jobs:
       fail-fast: false
       matrix:
         node_version:
-          - "16.13.0"
           - "18.x"
+          - "16.13.0"
         ts_version:
           - "latest"
-          - "4.4.4"
+          - "4.9.5"
+          - "4.6.4"
           - "4.3.5"
-          - "4.2.4"
     steps:
       - uses: actions/checkout@v3
       - uses: ./.github/actions/prepare

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "ts-api-utils",
-	"version": "0.1.0",
+	"version": "0.2.0",
 	"description": "Utility functions for working with TypeScript's API. Successor to the wonderful tsutils.",
 	"repository": {
 		"type": "git",

src/tokens.ts

@@ -5,8 +5,6 @@
 
 import ts from "typescript";
 
-import { isTsVersionAtLeast } from "./utils";
-
 /**
  * Callback type used for {@link forEachToken}.
  *
@@ -35,11 +33,9 @@ export function forEachToken(
 	callback: ForEachTokenCallback,
 	sourceFile: ts.SourceFile = node.getSourceFile()
 ): void {
-	const isTS4dot3 = isTsVersionAtLeast(4, 3);
-
 	const queue = [];
 	while (true) {
-		if (isTS4dot3 && ts.isTokenKind(node.kind)) {
+		if (ts.isTokenKind(node.kind)) {
 			callback(node);
 		} else if (
 			// eslint-disable-next-line deprecation/deprecation -- need for support of TS < 4.7

src/types/getters.test.ts

@@ -2,7 +2,6 @@ import ts from "typescript";
 import { describe, expect, it } from "vitest";
 
 import { createSourceFileAndTypeChecker } from "../test/utils";
-import { isTsVersionAtLeast } from "../utils";
 import {
 	getCallSignaturesOfType,
 	getWellKnownSymbolPropertyOfType,
@@ -77,25 +76,23 @@ describe("getWellKnownSymbolPropertyOfType", () => {
 		});
 	});
 
-	if (isTsVersionAtLeast(4, 3)) {
-		// https://github.com/JoshuaKGoldberg/ts-api-tools/issues/15
-		it("finds the symbol for an `asyncIterator` property when that property isn't directly on the type", () => {
-			const { sourceFile, typeChecker } = createSourceFileAndTypeChecker(`
+	// https://github.com/JoshuaKGoldberg/ts-api-tools/issues/15
+	it("finds the symbol for an `asyncIterator` property when that property isn't directly on the type", () => {
+		const { sourceFile, typeChecker } = createSourceFileAndTypeChecker(`
 			declare const x: Omit<{
 				[Symbol.asyncIterator](): AsyncIterator<any>;
 			}, 'z'>
 		`);
 
-			const node = (sourceFile.statements[0] as ts.VariableStatement)
-				.declarationList.declarations[0].name;
+		const node = (sourceFile.statements[0] as ts.VariableStatement)
+			.declarationList.declarations[0].name;
 
-			const type = typeChecker.getTypeAtLocation(node);
+		const type = typeChecker.getTypeAtLocation(node);
 
-			expect(
-				getWellKnownSymbolPropertyOfType(type, "asyncIterator", typeChecker)
-			).toMatchObject({
-				name: /^__@asyncIterator/,
-			});
+		expect(
+			getWellKnownSymbolPropertyOfType(type, "asyncIterator", typeChecker)
+		).toMatchObject({
+			name: /^__@asyncIterator/,
 		});
-	}
+	});
 });