Add support for TypeScript 3.8

Closes #35. Fixes #39.

README.md

@@ -248,7 +248,7 @@ addition to the alphabetical rule: `"."` and `".."` are treated as `"./"` and
 `"../"`.
 
 If both `import type` _and_ regular imports are used for the same source, the
-[Flow type imports] come first.
+type imports come first.
 
 Example:
 
@@ -281,7 +281,7 @@ import i from "./styles";
 
 // Regardless of group, imported items are sorted like this:
 import {
-  // First, Flow type imports.
+  // First, type imports.
   type x,
   typeof y,
   // Numbers are sorted by their numeric value:

examples/readme-order.js

@@ -25,7 +25,7 @@ import i from "./styles";
 
 // Regardless of group, imported items are sorted like this:
 import {
-  // First, Flow type imports.
+  // First, type imports.
   type x,
   typeof y,
   // Then everything else, alphabetically:

src/sort.js

@@ -787,7 +787,7 @@ function sortImportItems(items) {
         // The `.source` has been slightly tweaked. To stay fully deterministic,
         // also sort on the original value.
         compare(itemA.source.originalSource, itemB.source.originalSource) ||
-        // Then put Flow type imports before regular ones.
+        // Then put type imports before regular ones.
         compare(itemA.source.importKind, itemB.source.importKind) ||
         // Keep the original order if the sources are the same. It's not worth
         // trying to compare anything else, and you can use `import/no-duplicates`
@@ -799,7 +799,7 @@ function sortImportItems(items) {
 function sortSpecifierItems(items) {
   return items.slice().sort(
     (itemA, itemB) =>
-      // Put Flow type imports before regular ones.
+      // Put type imports before regular ones.
       compare(getImportKind(itemA.node), getImportKind(itemB.node)) ||
       // Then compare by name.
       compare(itemA.node.imported.name, itemB.node.imported.name) ||
@@ -839,7 +839,7 @@ function isImportSpecifier(node) {
 function isSideEffectImport(importNode, sourceCode) {
   return (
     importNode.specifiers.length === 0 &&
-    !importNode.importKind &&
+    (!importNode.importKind || importNode.importKind === "value") &&
     !isPunctuator(sourceCode.getFirstToken(importNode, { skip: 1 }), "{")
   );
 }
@@ -887,9 +887,9 @@ function getSource(importNode) {
 }
 
 function getImportKind(importNode) {
-  // Flow `type` and `typeof` imports. Default to "\uffff" to make regular
-  // imports come after the type imports.
-  return importNode.importKind || "\uffff";
+  // `type` and `typeof` imports. Default to "value" (like TypeScript) to make
+  // regular imports come after the type imports.
+  return importNode.importKind || "value";
 }
 
 // Like `Array.prototype.findIndex`, but searches from the end.

test/__snapshots__/examples.test.js.snap

@@ -295,7 +295,7 @@ import h from "./constants";
 import i from "./styles";
 // Regardless of group, imported items are sorted like this:
 import {
-  // First, Flow type imports.
+  // First, type imports.
   type x,
   typeof y,
   // Numbers are sorted by their numeric value:

test/sort.test.js

@@ -1814,13 +1814,16 @@ const typescriptTests = {
       code: input`
           |import React from "react";
           |import Button from "../Button";
+          |import type {target, type as tipe, Button} from "../Button";
           |
           |import styles from "./styles.css";
           |import { getUser } from "../../api";
           |
           |import PropTypes from "prop-types";
+          |import { /* X */ } from "prop-types";
           |import classnames from "classnames";
           |import { truncate, formatNumber } from "../../utils";
+          |import type X from "../Button";
           |
           |function pluck<T, K extends keyof T>(o: T, names: K[]): T[K][] {
           |  return names.map(n => o[n]);
@@ -1830,10 +1833,13 @@ const typescriptTests = {
         expect(actual).toMatchInlineSnapshot(`
           |import classnames from "classnames";
           |import PropTypes from "prop-types";
+          |import { /* X */ } from "prop-types";
           |import React from "react";
           |
           |import { getUser } from "../../api";
           |import { formatNumber,truncate } from "../../utils";
+          |import type {Button,target, type as tipe} from "../Button";
+          |import type X from "../Button";
           |import Button from "../Button";
           |import styles from "./styles.css";
           |