Style: Enforce extensions (#11227)

.eslintrc.js

@@ -17,13 +17,6 @@ module.exports = {
     curly: "error",
     "dot-notation": "error",
     eqeqeq: "error",
-    "import/no-extraneous-dependencies": [
-      "error",
-      {
-        devDependencies: ["tests*/**", "scripts/**"],
-      },
-    ],
-    "import/order": "error",
     "no-console": isCI ? "error" : "off",
     "no-else-return": [
       "error",
@@ -96,6 +89,16 @@ module.exports = {
         exceptRange: true,
       },
     ],
+
+    "import/extensions": ["error", "always", { ignorePackages: true }],
+    "import/no-extraneous-dependencies": [
+      "error",
+      {
+        devDependencies: ["tests*/**", "scripts/**"],
+      },
+    ],
+    "import/order": "error",
+
     "regexp/match-any": [
       "error",
       {
@@ -103,6 +106,7 @@ module.exports = {
       },
     ],
     "regexp/no-useless-flag": "error",
+
     "unicorn/better-regex": "error",
     "unicorn/explicit-length-check": "error",
     "unicorn/new-for-builtins": "error",

bin/prettier.js

@@ -2,4 +2,4 @@
 
 "use strict";
 
-module.exports = require("../src/cli").run(process.argv.slice(2));
+module.exports = require("../src/cli/index.js").run(process.argv.slice(2));

index.js

@@ -1,3 +1,3 @@
 "use strict";
 
-module.exports = require("./src/index");
+module.exports = require("./src/index.js");

jest.config.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const path = require("path");
-const installPrettier = require("./scripts/install-prettier");
+const installPrettier = require("./scripts/install-prettier.js");
 
 const PROJECT_ROOT = __dirname;
 const isProduction = process.env.NODE_ENV === "production";

scripts/build/build.mjs

@@ -22,7 +22,7 @@ process.on("unhandledRejection", (err) => {
   process.exit(1);
 });
 
-const CACHE_VERSION = "v37"; // This need update when updating build scripts
+const CACHE_VERSION = "v38"; // This need update when updating build scripts
 const statusConfig = [
   { color: "bgYellow", text: "CACHED" },
   { color: "bgGreen", text: "DONE" },

scripts/release/release.js

@@ -9,7 +9,7 @@ async function run() {
   const minimist = require("minimist");
   const semver = require("semver");
   const { string: outdentString } = require("outdent");
-  const { runGit, readJson } = require("./utils");
+  const { runGit, readJson } = require("./utils.js");
 
   const params = minimist(process.argv.slice(2), {
     string: ["version"],
@@ -33,18 +33,18 @@ async function run() {
   }
 
   const steps = [
-    require("./steps/validate-new-version"),
-    require("./steps/check-git-status"),
-    require("./steps/install-dependencies"),
-    require("./steps/run-tests"),
-    require("./steps/update-version"),
-    require("./steps/generate-bundles"),
-    require("./steps/update-changelog"),
-    require("./steps/push-to-git"),
-    require("./steps/publish-to-npm"),
-    require("./steps/bump-prettier"),
-    require("./steps/update-dependents-count"),
-    require("./steps/post-publish-steps"),
+    require("./steps/validate-new-version.js"),
+    require("./steps/check-git-status.js"),
+    require("./steps/install-dependencies.js"),
+    require("./steps/run-tests.js"),
+    require("./steps/update-version.js"),
+    require("./steps/generate-bundles.js"),
+    require("./steps/update-changelog.js"),
+    require("./steps/push-to-git.js"),
+    require("./steps/publish-to-npm.js"),
+    require("./steps/bump-prettier.js"),
+    require("./steps/update-dependents-count.js"),
+    require("./steps/post-publish-steps.js"),
   ];
 
   try {

scripts/release/steps/bump-prettier.js

@@ -8,7 +8,7 @@ const {
   logPromise,
   readJson,
   writeJson,
-} = require("../utils");
+} = require("../utils.js");
 
 async function format() {
   await runYarn(["lint:eslint", "--fix"]);

scripts/release/steps/check-git-status.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { runGit } = require("../utils");
+const { runGit } = require("../utils.js");
 
 module.exports = async function () {
   const { stdout: status } = await runGit(["status", "--porcelain"]);

scripts/release/steps/generate-bundles.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const chalk = require("chalk");
-const { runYarn, logPromise, readJson } = require("../utils");
+const { runYarn, logPromise, readJson } = require("../utils.js");
 
 module.exports = async function ({ version }) {
   await logPromise("Generating bundles", runYarn(["build", "--purge-cache"]));

scripts/release/steps/install-dependencies.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const execa = require("execa");
-const { runYarn, runGit, logPromise } = require("../utils");
+const { runYarn, runGit, logPromise } = require("../utils.js");
 
 async function install() {
   await execa("rm", ["-rf", "node_modules"]);

scripts/release/steps/post-publish-steps.js

@@ -3,7 +3,7 @@
 const chalk = require("chalk");
 const { string: outdentString } = require("outdent");
 const execa = require("execa");
-const { fetchText, logPromise } = require("../utils");
+const { fetchText, logPromise } = require("../utils.js");
 
 const SCHEMA_REPO = "SchemaStore/schemastore";
 const SCHEMA_PATH = "src/schemas/json/prettierrc.json";

scripts/release/steps/publish-to-npm.js

@@ -3,7 +3,7 @@
 const chalk = require("chalk");
 const { string: outdentString } = require("outdent");
 const execa = require("execa");
-const { logPromise, waitForEnter } = require("../utils");
+const { logPromise, waitForEnter } = require("../utils.js");
 
 /**
  * Retry "npm publish" when to enter OTP is failed.

scripts/release/steps/push-to-git.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { runGit, logPromise } = require("../utils");
+const { runGit, logPromise } = require("../utils.js");
 
 async function pushGit({ version }) {
   await runGit(["commit", "-am", `Release ${version}`]);

scripts/release/steps/run-tests.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { runYarn, logPromise } = require("../utils");
+const { runYarn, logPromise } = require("../utils.js");
 
 module.exports = async function () {
   await logPromise("Running linter", runYarn("lint:eslint"));

scripts/release/steps/update-changelog.js

@@ -5,7 +5,7 @@ const execa = require("execa");
 const chalk = require("chalk");
 const { outdent, string: outdentString } = require("outdent");
 const semver = require("semver");
-const { waitForEnter, runYarn, logPromise } = require("../utils");
+const { waitForEnter, runYarn, logPromise } = require("../utils.js");
 
 function getBlogPostInfo(version) {
   const date = new Date();

scripts/release/steps/update-dependents-count.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const chalk = require("chalk");
-const { runGit, fetchText, logPromise, processFile } = require("../utils");
+const { runGit, fetchText, logPromise, processFile } = require("../utils.js");
 
 async function update() {
   const npmPage = await logPromise(

scripts/release/steps/update-version.js

@@ -6,7 +6,7 @@ const {
   readJson,
   writeJson,
   processFile,
-} = require("../utils");
+} = require("../utils.js");
 
 async function bump({ version }) {
   const pkg = await readJson("package.json");

scripts/tools/eslint-plugin-prettier-internal-rules/index.js

@@ -2,20 +2,20 @@
 
 module.exports = {
   rules: {
-    "better-parent-property-check-in-needs-parens": require("./better-parent-property-check-in-needs-parens"),
-    "consistent-negative-index-access": require("./consistent-negative-index-access"),
-    "directly-loc-start-end": require("./directly-loc-start-end"),
-    "flat-ast-path-call": require("./flat-ast-path-call"),
-    "jsx-identifier-case": require("./jsx-identifier-case"),
-    "no-conflicting-comment-check-flags": require("./no-conflicting-comment-check-flags"),
-    "no-doc-builder-concat": require("./no-doc-builder-concat"),
-    "no-empty-flat-contents-for-if-break": require("./no-empty-flat-contents-for-if-break"),
-    "no-identifier-n": require("./no-identifier-n"),
-    "no-node-comments": require("./no-node-comments"),
-    "no-unnecessary-ast-path-call": require("./no-unnecessary-ast-path-call"),
-    "prefer-ast-path-each": require("./prefer-ast-path-each"),
-    "prefer-indent-if-break": require("./prefer-indent-if-break"),
-    "prefer-is-non-empty-array": require("./prefer-is-non-empty-array"),
-    "require-json-extensions": require("./require-json-extensions"),
+    "better-parent-property-check-in-needs-parens": require("./better-parent-property-check-in-needs-parens.js"),
+    "consistent-negative-index-access": require("./consistent-negative-index-access.js"),
+    "directly-loc-start-end": require("./directly-loc-start-end.js"),
+    "flat-ast-path-call": require("./flat-ast-path-call.js"),
+    "jsx-identifier-case": require("./jsx-identifier-case.js"),
+    "no-conflicting-comment-check-flags": require("./no-conflicting-comment-check-flags.js"),
+    "no-doc-builder-concat": require("./no-doc-builder-concat.js"),
+    "no-empty-flat-contents-for-if-break": require("./no-empty-flat-contents-for-if-break.js"),
+    "no-identifier-n": require("./no-identifier-n.js"),
+    "no-node-comments": require("./no-node-comments.js"),
+    "no-unnecessary-ast-path-call": require("./no-unnecessary-ast-path-call.js"),
+    "prefer-ast-path-each": require("./prefer-ast-path-each.js"),
+    "prefer-indent-if-break": require("./prefer-indent-if-break.js"),
+    "prefer-is-non-empty-array": require("./prefer-is-non-empty-array.js"),
+    "require-json-extensions": require("./require-json-extensions.js"),
   },
 };

src/cli/constant.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const { outdent } = require("outdent");
-const { coreOptions } = require("./prettier-internal");
+const { coreOptions } = require("./prettier-internal.js");
 
 const categoryOrder = [
   coreOptions.CATEGORY_OUTPUT,

src/cli/context.js

@@ -2,19 +2,19 @@
 const pick = require("lodash/pick");
 
 // eslint-disable-next-line no-restricted-modules
-const prettier = require("../index");
+const prettier = require("../index.js");
 const {
   optionsModule,
   optionsNormalizer: { normalizeCliOptions },
   utils: { arrayify },
-} = require("./prettier-internal");
-const minimist = require("./minimist");
-const constant = require("./constant");
+} = require("./prettier-internal.js");
+const minimist = require("./minimist.js");
+const constant = require("./constant.js");
 const {
   createDetailedOptionMap,
   normalizeDetailedOptionMap,
-} = require("./option-map");
-const createMinimistOptions = require("./create-minimist-options");
+} = require("./option-map.js");
+const createMinimistOptions = require("./create-minimist-options.js");
 
 /**
  * @typedef {Object} Context

src/cli/core.js

@@ -5,16 +5,16 @@ const path = require("path");
 const stringify = require("fast-json-stable-stringify");
 
 // eslint-disable-next-line no-restricted-modules
-const prettier = require("../index");
+const prettier = require("../index.js");
 
-const { format, formatStdin, formatFiles } = require("./format");
-const { Context, parseArgvWithoutPlugins } = require("./context");
+const { format, formatStdin, formatFiles } = require("./format.js");
+const { Context, parseArgvWithoutPlugins } = require("./context.js");
 const {
   normalizeDetailedOptionMap,
   createDetailedOptionMap,
-} = require("./option-map");
-const { createDetailedUsage, createUsage } = require("./usage");
-const { createLogger } = require("./logger");
+} = require("./option-map.js");
+const { createDetailedUsage, createUsage } = require("./usage.js");
+const { createLogger } = require("./logger.js");
 
 async function logResolvedConfigPathOrDie(context) {
   const file = context.argv["find-config-path"];

src/cli/format.js

@@ -6,14 +6,14 @@ const path = require("path");
 const chalk = require("chalk");
 
 // eslint-disable-next-line no-restricted-modules
-const prettier = require("../index");
+const prettier = require("../index.js");
 // eslint-disable-next-line no-restricted-modules
-const { getStdin } = require("../common/third-party");
+const { getStdin } = require("../common/third-party.js");
 
-const { createIgnorer, errors } = require("./prettier-internal");
-const { expandPatterns, fixWindowsSlashes } = require("./expand-patterns");
-const { getOptionsForFile } = require("./option");
-const isTTY = require("./is-tty");
+const { createIgnorer, errors } = require("./prettier-internal.js");
+const { expandPatterns, fixWindowsSlashes } = require("./expand-patterns.js");
+const { getOptionsForFile } = require("./option.js");
+const isTTY = require("./is-tty.js");
 
 function diff(a, b) {
   return require("diff").createTwoFilesPatch("", "", a, b, "", "", {

src/cli/index.js

@@ -7,8 +7,8 @@ require("please-upgrade-node")(packageJson);
 // eslint-disable-next-line import/order
 const stringify = require("fast-json-stable-stringify");
 // eslint-disable-next-line no-restricted-modules
-const prettier = require("../index");
-const core = require("./core");
+const prettier = require("../index.js");
+const core = require("./core.js");
 
 async function run(rawArguments) {
   // Create a default level logger, so we can log errors during `logLevel` parsing

src/cli/is-tty.js

@@ -1,7 +1,7 @@
 "use strict";
 
 // eslint-disable-next-line no-restricted-modules
-const { isCI } = require("../common/third-party");
+const { isCI } = require("../common/third-party.js");
 
 // Some CI pipelines incorrectly report process.stdout.isTTY status,
 // which causes unwanted lines in the output. An additional check for isCI() helps.

src/cli/option-map.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const dashify = require("dashify");
-const { coreOptions } = require("./prettier-internal");
+const { coreOptions } = require("./prettier-internal.js");
 
 function normalizeDetailedOption(name, option) {
   return {

src/cli/option.js

@@ -2,10 +2,10 @@
 
 const dashify = require("dashify");
 // eslint-disable-next-line no-restricted-modules
-const prettier = require("../index");
-const minimist = require("./minimist");
-const { optionsNormalizer } = require("./prettier-internal");
-const createMinimistOptions = require("./create-minimist-options");
+const prettier = require("../index.js");
+const minimist = require("./minimist.js");
+const { optionsNormalizer } = require("./prettier-internal.js");
+const createMinimistOptions = require("./create-minimist-options.js");
 
 function getOptions(argv, detailedOptions) {
   return Object.fromEntries(

src/cli/prettier-internal.js

@@ -1,4 +1,4 @@
 "use strict";
 
 // eslint-disable-next-line no-restricted-modules
-module.exports = require("../index").__internal;
+module.exports = require("../index.js").__internal;

src/cli/usage.js

@@ -2,7 +2,7 @@
 
 const groupBy = require("lodash/groupBy");
 const camelCase = require("camelcase");
-const constant = require("./constant");
+const constant = require("./constant.js");
 
 const OPTION_USAGE_THRESHOLD = 25;
 const CHOICE_USAGE_MARGIN = 3;

src/common/ast-path.js

@@ -1,5 +1,5 @@
 "use strict";
-const getLast = require("../utils/get-last");
+const getLast = require("../utils/get-last.js");
 
 function getNodeHelper(path, count) {
   const stackIndex = getNodeStackIndexHelper(path.stack, count);

src/common/create-ignorer.js

@@ -2,7 +2,7 @@
 
 const path = require("path");
 const ignore = require("ignore");
-const getFileContentOrNull = require("../utils/get-file-content-or-null");
+const getFileContentOrNull = require("../utils/get-file-content-or-null.js");
 
 /**
  * @param {string?} ignorePath

src/common/get-file-info.js

@@ -1,9 +1,9 @@
 "use strict";
 
 const path = require("path");
-const options = require("../main/options");
-const config = require("../config/resolve-config");
-const createIgnorer = require("./create-ignorer");
+const options = require("../main/options.js");
+const config = require("../config/resolve-config.js");
+const createIgnorer = require("./create-ignorer.js");
 
 /**
  * @typedef {{ ignorePath?: string, withNodeModules?: boolean, plugins: object }} FileInfoOptions

src/common/load-plugins.js

@@ -6,9 +6,9 @@ const uniqBy = require("lodash/uniqBy");
 const partition = require("lodash/partition");
 const globby = require("globby");
 const mem = require("mem");
-const internalPlugins = require("../languages");
-const thirdParty = require("./third-party");
-const resolve = require("./resolve");
+const internalPlugins = require("../languages.js");
+const thirdParty = require("./third-party.js");
+const resolve = require("./resolve.js");
 
 const memoizedLoad = mem(load, { cacheKey: JSON.stringify });
 const memoizedSearch = mem(findPluginsInNodeModules);

src/common/util-shared.js

@@ -24,7 +24,7 @@ const {
   addLeadingComment,
   addDanglingComment,
   addTrailingComment,
-} = require("./util");
+} = require("./util.js");
 
 module.exports = {
   getMaxContinuousCount,

src/common/util.js

@@ -2,8 +2,8 @@
 
 const stringWidth = require("string-width");
 const escapeStringRegexp = require("escape-string-regexp");
-const getLast = require("../utils/get-last");
-const { getSupportInfo } = require("../main/support");
+const getLast = require("../utils/get-last.js");
+const { getSupportInfo } = require("../main/support.js");
 
 const notAsciiRegex = /[^\x20-\x7F]/;
 

src/config/resolve-config-editorconfig.js

@@ -5,7 +5,7 @@ const path = require("path");
 const editorconfig = require("editorconfig");
 const mem = require("mem");
 const editorConfigToPrettier = require("editorconfig-to-prettier");
-const findProjectRoot = require("./find-project-root");
+const findProjectRoot = require("./find-project-root.js");
 
 const jsonStringifyMem = (fn) => mem(fn, { cacheKey: JSON.stringify });
 

src/config/resolve-config.js

@@ -3,12 +3,12 @@
 const path = require("path");
 const minimatch = require("minimatch");
 const mem = require("mem");
-const thirdParty = require("../common/third-party");
+const thirdParty = require("../common/third-party.js");
 
-const loadToml = require("../utils/load-toml");
-const loadJson5 = require("../utils/load-json5");
-const resolve = require("../common/resolve");
-const resolveEditorConfig = require("./resolve-config-editorconfig");
+const loadToml = require("../utils/load-toml.js");
+const loadJson5 = require("../utils/load-json5.js");
+const resolve = require("../common/resolve.js");
+const resolveEditorConfig = require("./resolve-config-editorconfig.js");
 
 /**
  * @typedef {import("cosmiconfig/dist/Explorer").Explorer} Explorer

src/document/doc-debug.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { isConcat, getDocParts } = require("./doc-utils");
+const { isConcat, getDocParts } = require("./doc-utils.js");
 
 function flattenDoc(doc) {
   if (!doc) {

src/document/doc-printer.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const { getStringWidth, getLast } = require("../common/util");
-const { convertEndOfLineToChars } = require("../common/end-of-line");
-const { fill, cursor, indent } = require("./doc-builders");
-const { isConcat, getDocParts } = require("./doc-utils");
+const { getStringWidth, getLast } = require("../common/util.js");
+const { convertEndOfLineToChars } = require("../common/end-of-line.js");
+const { fill, cursor, indent } = require("./doc-builders.js");
+const { isConcat, getDocParts } = require("./doc-utils.js");
 
 /** @type {Record<symbol, typeof MODE_BREAK | typeof MODE_FLAT>} */
 let groupModeMap;

src/document/doc-utils.js

@@ -1,6 +1,6 @@
 "use strict";
-const getLast = require("../utils/get-last");
-const { literalline, join } = require("./doc-builders");
+const getLast = require("../utils/get-last.js");
+const { literalline, join } = require("./doc-builders.js");
 
 const isConcat = (doc) => Array.isArray(doc) || (doc && doc.type === "concat");
 const getDocParts = (doc) => {

src/document/index.js

@@ -5,8 +5,8 @@
  */
 
 module.exports = {
-  builders: require("./doc-builders"),
-  printer: require("./doc-printer"),
-  utils: require("./doc-utils"),
-  debug: require("./doc-debug"),
+  builders: require("./doc-builders.js"),
+  printer: require("./doc-printer.js"),
+  utils: require("./doc-utils.js"),
+  debug: require("./doc-debug.js"),
 };

src/index.js

@@ -2,13 +2,13 @@
 
 const { version } = require("../package.json");
 
-const core = require("./main/core");
-const { getSupportInfo } = require("./main/support");
-const getFileInfo = require("./common/get-file-info");
-const sharedUtil = require("./common/util-shared");
-const plugins = require("./common/load-plugins");
-const config = require("./config/resolve-config");
-const doc = require("./document");
+const core = require("./main/core.js");
+const { getSupportInfo } = require("./main/support.js");
+const getFileInfo = require("./common/get-file-info.js");
+const sharedUtil = require("./common/util-shared.js");
+const plugins = require("./common/load-plugins.js");
+const config = require("./config/resolve-config.js");
+const doc = require("./document/index.js");
 
 function _withPlugins(
   fn,
@@ -67,13 +67,13 @@ module.exports = {
 
   // Internal shared
   __internal: {
-    errors: require("./common/errors"),
-    coreOptions: require("./main/core-options"),
-    createIgnorer: require("./common/create-ignorer"),
-    optionsModule: require("./main/options"),
-    optionsNormalizer: require("./main/options-normalizer"),
+    errors: require("./common/errors.js"),
+    coreOptions: require("./main/core-options.js"),
+    createIgnorer: require("./common/create-ignorer.js"),
+    optionsModule: require("./main/options.js"),
+    optionsNormalizer: require("./main/options-normalizer.js"),
     utils: {
-      arrayify: require("./utils/arrayify"),
+      arrayify: require("./utils/arrayify.js"),
     },
   },
 

src/language-css/clean.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const { isFrontMatterNode } = require("../common/util");
-const getLast = require("../utils/get-last");
+const { isFrontMatterNode } = require("../common/util.js");
+const getLast = require("../utils/get-last.js");
 
 const ignoredProperties = new Set([
   "raw", // front-matter

src/language-css/embed.js

@@ -1,8 +1,8 @@
 "use strict";
 const {
   builders: { hardline },
-} = require("../document");
-const printFrontMatter = require("../utils/front-matter/print");
+} = require("../document/index.js");
+const printFrontMatter = require("../utils/front-matter/print.js");
 
 function embed(path, print, textToDoc /*, options */) {
   const node = path.getValue();

src/language-css/index.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createLanguage = require("../utils/create-language");
-const printer = require("./printer-postcss");
-const options = require("./options");
-const parsers = require("./parsers");
+const createLanguage = require("../utils/create-language.js");
+const printer = require("./printer-postcss.js");
+const options = require("./options.js");
+const parsers = require("./parsers.js");
 
 const languages = [
   createLanguage(require("linguist-languages/data/CSS.json"), (data) => ({

src/language-css/loc.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const lineColumnToIndex = require("../utils/line-column-to-index");
-const { getLast, skipEverythingButNewLine } = require("../common/util");
+const lineColumnToIndex = require("../utils/line-column-to-index.js");
+const { getLast, skipEverythingButNewLine } = require("../common/util.js");
 
 function calculateLocStart(node, text) {
   // value-* nodes have this

src/language-css/options.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const commonOptions = require("../common/common-options");
+const commonOptions = require("../common/common-options.js");
 
 // format based on https://github.com/prettier/prettier/blob/main/src/main/core-options.js
 module.exports = {

src/language-css/parser-postcss.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createError = require("../common/parser-create-error");
-const getLast = require("../utils/get-last");
-const parseFrontMatter = require("../utils/front-matter/parse");
-const { hasPragma } = require("./pragma");
+const createError = require("../common/parser-create-error.js");
+const getLast = require("../utils/get-last.js");
+const parseFrontMatter = require("../utils/front-matter/parse.js");
+const { hasPragma } = require("./pragma.js");
 const {
   hasSCSSInterpolation,
   hasStringOrFunction,
@@ -12,9 +12,9 @@ const {
   isSCSSNestedPropertyNode,
   isSCSSVariable,
   stringifyNode,
-} = require("./utils");
-const { locStart, locEnd } = require("./loc");
-const { calculateLoc, replaceQuotesInInlineComments } = require("./loc");
+} = require("./utils.js");
+const { locStart, locEnd } = require("./loc.js");
+const { calculateLoc, replaceQuotesInInlineComments } = require("./loc.js");
 
 const getHighestAncestor = (node) => {
   while (node.parent) {

src/language-css/parsers.js

@@ -3,12 +3,12 @@
 module.exports = {
   // TODO: switch these to just `postcss` and use `language` instead.
   get css() {
-    return require("./parser-postcss").parsers.css;
+    return require("./parser-postcss.js").parsers.css;
   },
   get less() {
-    return require("./parser-postcss").parsers.less;
+    return require("./parser-postcss.js").parsers.less;
   },
   get scss() {
-    return require("./parser-postcss").parsers.scss;
+    return require("./parser-postcss.js").parsers.scss;
   },
 };

src/language-css/pragma.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const jsPragma = require("../language-js/pragma");
-const parseFrontMatter = require("../utils/front-matter/parse");
+const jsPragma = require("../language-js/pragma.js");
+const parseFrontMatter = require("../utils/front-matter/parse.js");
 
 function hasPragma(text) {
   return jsPragma.hasPragma(parseFrontMatter(text).content);

src/language-css/printer-postcss.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const getLast = require("../utils/get-last");
+const getLast = require("../utils/get-last.js");
 const {
   printNumber,
   printString,
@@ -8,7 +8,7 @@ const {
   isFrontMatterNode,
   isNextLineEmpty,
   isNonEmptyArray,
-} = require("../common/util");
+} = require("../common/util.js");
 const {
   builders: {
     join,
@@ -23,10 +23,10 @@ const {
     breakParent,
   },
   utils: { removeLines, getDocParts },
-} = require("../document");
-const clean = require("./clean");
-const embed = require("./embed");
-const { insertPragma } = require("./pragma");
+} = require("../document/index.js");
+const clean = require("./clean.js");
+const embed = require("./embed.js");
+const { insertPragma } = require("./pragma.js");
 
 const {
   getAncestorNode,
@@ -74,8 +74,8 @@ const {
   isColorAdjusterFuncNode,
   lastLineHasInlineComment,
   isAtWordPlaceholderNode,
-} = require("./utils");
-const { locStart, locEnd } = require("./loc");
+} = require("./utils.js");
+const { locStart, locEnd } = require("./loc.js");
 
 function shouldPrintComma(options) {
   return options.trailingComma === "es5" || options.trailingComma === "all";

src/language-css/utils.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { isNonEmptyArray } = require("../common/util");
+const { isNonEmptyArray } = require("../common/util.js");
 const colorAdjusterFunctions = new Set([
   "red",
   "green",

src/language-graphql/index.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createLanguage = require("../utils/create-language");
-const printer = require("./printer-graphql");
-const options = require("./options");
-const parsers = require("./parsers");
+const createLanguage = require("../utils/create-language.js");
+const printer = require("./printer-graphql.js");
+const options = require("./options.js");
+const parsers = require("./parsers.js");
 
 const languages = [
   createLanguage(require("linguist-languages/data/GraphQL.json"), () => ({

src/language-graphql/options.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const commonOptions = require("../common/common-options");
+const commonOptions = require("../common/common-options.js");
 
 // format based on https://github.com/prettier/prettier/blob/main/src/main/core-options.js
 module.exports = {

src/language-graphql/parser-graphql.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createError = require("../common/parser-create-error");
-const tryCombinations = require("../utils/try-combinations");
-const { hasPragma } = require("./pragma");
-const { locStart, locEnd } = require("./loc");
+const createError = require("../common/parser-create-error.js");
+const tryCombinations = require("../utils/try-combinations.js");
+const { hasPragma } = require("./pragma.js");
+const { locStart, locEnd } = require("./loc.js");
 
 function parseComments(ast) {
   const comments = [];

src/language-graphql/parsers.js

@@ -2,6 +2,6 @@
 
 module.exports = {
   get graphql() {
-    return require("./parser-graphql").parsers.graphql;
+    return require("./parser-graphql.js").parsers.graphql;
   },
 };

src/language-graphql/printer-graphql.js

@@ -2,10 +2,10 @@
 
 const {
   builders: { join, hardline, line, softline, group, indent, ifBreak },
-} = require("../document");
-const { isNextLineEmpty, isNonEmptyArray } = require("../common/util");
-const { insertPragma } = require("./pragma");
-const { locStart, locEnd } = require("./loc");
+} = require("../document/index.js");
+const { isNextLineEmpty, isNonEmptyArray } = require("../common/util.js");
+const { insertPragma } = require("./pragma.js");
+const { locStart, locEnd } = require("./loc.js");
 
 function genericPrint(path, options, print) {
   const node = path.getValue();

src/language-handlebars/index.js

@@ -1,8 +1,8 @@
 "use strict";
 
-const createLanguage = require("../utils/create-language");
-const printer = require("./printer-glimmer");
-const parsers = require("./parsers");
+const createLanguage = require("../utils/create-language.js");
+const printer = require("./printer-glimmer.js");
+const parsers = require("./parsers.js");
 
 const languages = [
   createLanguage(require("linguist-languages/data/Handlebars.json"), () => ({

src/language-handlebars/parser-glimmer.js

@@ -1,8 +1,8 @@
 "use strict";
 
 const LinesAndColumns = require("lines-and-columns").default;
-const createError = require("../common/parser-create-error");
-const { locStart, locEnd } = require("./loc");
+const createError = require("../common/parser-create-error.js");
+const { locStart, locEnd } = require("./loc.js");
 
 /* from the following template: `non-escaped mustache \\{{helper}}`
  * glimmer parser will produce an AST missing a backslash

src/language-handlebars/parsers.js

@@ -2,6 +2,6 @@
 
 module.exports = {
   get glimmer() {
-    return require("./parser-glimmer").parsers.glimmer;
+    return require("./parser-glimmer.js").parsers.glimmer;
   },
 };

src/language-handlebars/printer-glimmer.js

@@ -14,10 +14,10 @@ const {
     literalline,
   },
   utils: { getDocParts, replaceEndOfLineWith },
-} = require("../document");
-const { isNonEmptyArray } = require("../common/util");
-const { locStart, locEnd } = require("./loc");
-const clean = require("./clean");
+} = require("../document/index.js");
+const { isNonEmptyArray } = require("../common/util.js");
+const { locStart, locEnd } = require("./loc.js");
+const clean = require("./clean.js");
 const {
   getNextNode,
   getPreviousNode,
@@ -29,7 +29,7 @@ const {
   isPreviousNodeOfSomeType,
   isVoid,
   isWhitespaceNode,
-} = require("./utils");
+} = require("./utils.js");
 
 const NEWLINES_TO_PRESERVE_MAX = 2;
 

src/language-handlebars/utils.js

@@ -1,7 +1,7 @@
 "use strict";
 
 const htmlVoidElements = require("html-void-elements");
-const getLast = require("../utils/get-last");
+const getLast = require("../utils/get-last.js");
 
 function isLastNodeOfSiblings(path) {
   const node = path.getValue();

src/language-html/ast.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const { isNonEmptyArray } = require("../common/util");
-const getLast = require("../utils/get-last");
+const { isNonEmptyArray } = require("../common/util.js");
+const getLast = require("../utils/get-last.js");
 
 const NODES_KEYS = {
   attrs: true,

src/language-html/clean.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { isFrontMatterNode } = require("../common/util");
+const { isFrontMatterNode } = require("../common/util.js");
 
 const ignoredProperties = new Set([
   "sourceSpan",

src/language-html/index.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createLanguage = require("../utils/create-language");
-const printer = require("./printer-html");
-const options = require("./options");
-const parsers = require("./parsers");
+const createLanguage = require("../utils/create-language.js");
+const printer = require("./printer-html.js");
+const options = require("./options.js");
+const parsers = require("./parsers.js");
 
 const languages = [
   createLanguage(require("linguist-languages/data/HTML.json"), () => ({

src/language-html/parser-html.js

@@ -5,19 +5,19 @@ const {
   ParseLocation,
   ParseSourceFile,
 } = require("angular-html-parser/lib/compiler/src/parse_util");
-const parseFrontMatter = require("../utils/front-matter/parse");
-const getLast = require("../utils/get-last");
-const createError = require("../common/parser-create-error");
-const { inferParserByLanguage } = require("../common/util");
+const parseFrontMatter = require("../utils/front-matter/parse.js");
+const getLast = require("../utils/get-last.js");
+const createError = require("../common/parser-create-error.js");
+const { inferParserByLanguage } = require("../common/util.js");
 const {
   HTML_ELEMENT_ATTRIBUTES,
   HTML_TAGS,
   isUnknownNamespace,
-} = require("./utils");
-const { hasPragma } = require("./pragma");
-const { Node } = require("./ast");
-const { parseIeConditionalComment } = require("./conditional-comment");
-const { locStart, locEnd } = require("./loc");
+} = require("./utils.js");
+const { hasPragma } = require("./pragma.js");
+const { Node } = require("./ast.js");
+const { parseIeConditionalComment } = require("./conditional-comment.js");
+const { locStart, locEnd } = require("./loc.js");
 
 /**
  * @typedef {import('angular-html-parser/lib/compiler/src/ml_parser/ast').Node} AstNode

src/language-html/parsers.js

@@ -3,18 +3,18 @@
 module.exports = {
   // HTML
   get html() {
-    return require("./parser-html").parsers.html;
+    return require("./parser-html.js").parsers.html;
   },
   // Vue
   get vue() {
-    return require("./parser-html").parsers.vue;
+    return require("./parser-html.js").parsers.vue;
   },
   // Angular
   get angular() {
-    return require("./parser-html").parsers.angular;
+    return require("./parser-html.js").parsers.angular;
   },
   // Lightning Web Components
   get lwc() {
-    return require("./parser-html").parsers.lwc;
+    return require("./parser-html.js").parsers.lwc;
   },
 };

src/language-html/print-preprocess.js

@@ -3,7 +3,7 @@
 const {
   ParseSourceSpan,
 } = require("angular-html-parser/lib/compiler/src/parse_util");
-const getLast = require("../utils/get-last");
+const getLast = require("../utils/get-last.js");
 const {
   htmlTrim,
   getLeadingAndTrailingHtmlWhitespace,
@@ -15,7 +15,7 @@ const {
   isLeadingSpaceSensitiveNode,
   isTrailingSpaceSensitiveNode,
   isWhitespaceSensitiveNode,
-} = require("./utils");
+} = require("./utils.js");
 
 const PREPROCESS_PIPELINE = [
   removeIgnorableFirstLf,

src/language-html/printer-html.js

@@ -22,10 +22,10 @@ const {
     softline,
   },
   utils: { mapDoc, cleanDoc, getDocParts, isConcat, replaceEndOfLineWith },
-} = require("../document");
-const { isNonEmptyArray } = require("../common/util");
-const printFrontMatter = require("../utils/front-matter/print");
-const clean = require("./clean");
+} = require("../document/index.js");
+const { isNonEmptyArray } = require("../common/util.js");
+const printFrontMatter = require("../utils/front-matter/print.js");
+const clean = require("./clean.js");
 const {
   htmlTrimPreserveIndentation,
   splitByHtmlWhitespace,
@@ -50,16 +50,16 @@ const {
   shouldPreserveContent,
   unescapeQuoteEntities,
   isPreLikeNode,
-} = require("./utils");
-const preprocess = require("./print-preprocess");
-const { insertPragma } = require("./pragma");
-const { locStart, locEnd } = require("./loc");
+} = require("./utils.js");
+const preprocess = require("./print-preprocess.js");
+const { insertPragma } = require("./pragma.js");
+const { locStart, locEnd } = require("./loc.js");
 const {
   printVueFor,
   printVueBindings,
   isVueEventBindingExpression,
-} = require("./syntax-vue");
-const { printImgSrcset, printClassNames } = require("./syntax-attribute");
+} = require("./syntax-vue.js");
+const { printImgSrcset, printClassNames } = require("./syntax-attribute.js");
 
 function embed(path, print, textToDoc, options) {
   const node = path.getValue();

src/language-html/syntax-attribute.js

@@ -1,10 +1,10 @@
 "use strict";
 
 const parseSrcset = require("parse-srcset");
-const getLast = require("../utils/get-last");
+const getLast = require("../utils/get-last.js");
 const {
   builders: { group, ifBreak, indent, join, line, softline },
-} = require("../document");
+} = require("../document/index.js");
 
 function printImgSrcset(value) {
   const srcset = parseSrcset(value, {

src/language-html/syntax-vue.js

@@ -2,7 +2,7 @@
 
 const {
   builders: { group },
-} = require("../document");
+} = require("../document/index.js");
 
 /**
  *     v-for="... in ..."

src/language-html/utils.js

@@ -6,13 +6,16 @@
 
 const htmlTagNames = require("html-tag-names");
 const htmlElementAttributes = require("html-element-attributes");
-const { inferParserByLanguage, isFrontMatterNode } = require("../common/util");
+const {
+  inferParserByLanguage,
+  isFrontMatterNode,
+} = require("../common/util.js");
 const {
   CSS_DISPLAY_TAGS,
   CSS_DISPLAY_DEFAULT,
   CSS_WHITE_SPACE_TAGS,
   CSS_WHITE_SPACE_DEFAULT,
-} = require("./constants.evaluate");
+} = require("./constants.evaluate.js");
 
 const HTML_TAGS = arrayToMap(htmlTagNames);
 const HTML_ELEMENT_ATTRIBUTES = mapObject(htmlElementAttributes, arrayToMap);

src/language-js/clean.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { isBlockComment } = require("./utils");
+const { isBlockComment } = require("./utils.js");
 
 const ignoredProperties = new Set([
   "range",

src/language-js/comments.js

@@ -11,7 +11,7 @@ const {
   addDanglingComment,
   getNextNonSpaceNonCommentCharacterIndex,
   isNonEmptyArray,
-} = require("../common/util");
+} = require("../common/util.js");
 const {
   isBlockComment,
   getFunctionParameters,
@@ -25,8 +25,8 @@ const {
   isCallExpression,
   isMemberExpression,
   isObjectProperty,
-} = require("./utils");
-const { locStart, locEnd } = require("./loc");
+} = require("./utils.js");
+const { locStart, locEnd } = require("./loc.js");
 
 /**
  * @typedef {import("./types/estree").Node} Node

src/language-js/embed.js

@@ -1,10 +1,14 @@
 "use strict";
 
-const { hasComment, CommentCheckFlags, isObjectProperty } = require("./utils");
-const formatMarkdown = require("./embed/markdown");
-const formatCss = require("./embed/css");
-const formatGraphql = require("./embed/graphql");
-const formatHtml = require("./embed/html");
+const {
+  hasComment,
+  CommentCheckFlags,
+  isObjectProperty,
+} = require("./utils.js");
+const formatMarkdown = require("./embed/markdown.js");
+const formatCss = require("./embed/css.js");
+const formatGraphql = require("./embed/graphql.js");
+const formatHtml = require("./embed/html.js");
 
 function getLanguage(path) {
   if (

src/language-js/embed/css.js

@@ -1,11 +1,11 @@
 "use strict";
 
-const { isNonEmptyArray } = require("../../common/util");
+const { isNonEmptyArray } = require("../../common/util.js");
 const {
   builders: { indent, hardline, softline },
   utils: { mapDoc, replaceNewlinesWithLiterallines, cleanDoc },
-} = require("../../document");
-const { printTemplateExpressions } = require("../print/template-literal");
+} = require("../../document/index.js");
+const { printTemplateExpressions } = require("../print/template-literal.js");
 
 function format(path, print, textToDoc) {
   const node = path.getValue();

src/language-js/embed/graphql.js

@@ -2,11 +2,11 @@
 
 const {
   builders: { indent, join, hardline },
-} = require("../../document");
+} = require("../../document/index.js");
 const {
   escapeTemplateCharacters,
   printTemplateExpressions,
-} = require("../print/template-literal");
+} = require("../print/template-literal.js");
 
 function format(path, print, textToDoc) {
   const node = path.getValue();

src/language-js/embed/html.js

@@ -3,11 +3,11 @@
 const {
   builders: { indent, line, hardline, group },
   utils: { mapDoc },
-} = require("../../document");
+} = require("../../document/index.js");
 const {
   printTemplateExpressions,
   uncookTemplateElementValue,
-} = require("../print/template-literal");
+} = require("../print/template-literal.js");
 
 // The counter is needed to distinguish nested embeds.
 let htmlTemplateLiteralCounter = 0;

src/language-js/embed/markdown.js

@@ -2,8 +2,8 @@
 
 const {
   builders: { indent, softline, literalline, dedentToRoot },
-} = require("../../document");
-const { escapeTemplateCharacters } = require("../print/template-literal");
+} = require("../../document/index.js");
+const { escapeTemplateCharacters } = require("../print/template-literal.js");
 
 function format(path, print, textToDoc) {
   const node = path.getValue();

src/language-js/index.js

@@ -1,10 +1,10 @@
 "use strict";
 
-const createLanguage = require("../utils/create-language");
-const estreePrinter = require("./printer-estree");
-const estreeJsonPrinter = require("./printer-estree-json");
-const options = require("./options");
-const parsers = require("./parse/parsers");
+const createLanguage = require("../utils/create-language.js");
+const estreePrinter = require("./printer-estree.js");
+const estreeJsonPrinter = require("./printer-estree-json.js");
+const options = require("./options.js");
+const parsers = require("./parse/parsers.js");
 
 const languages = [
   createLanguage(

src/language-js/loc.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { isNonEmptyArray } = require("../common/util");
+const { isNonEmptyArray } = require("../common/util.js");
 
 /**
  * @typedef {import("./types/estree").Node} Node

src/language-js/needs-parens.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const getLast = require("../utils/get-last");
+const getLast = require("../utils/get-last.js");
 const {
   getFunctionParameters,
   getLeftSidePathName,
@@ -14,7 +14,7 @@ const {
   isCallExpression,
   isMemberExpression,
   isObjectProperty,
-} = require("./utils");
+} = require("./utils.js");
 
 function needsParens(path, options) {
   const parent = path.getParentNode();

src/language-js/options.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const commonOptions = require("../common/common-options");
+const commonOptions = require("../common/common-options.js");
 
 const CATEGORY_JAVASCRIPT = "JavaScript";
 

src/language-js/parse/angular.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const { locStart, locEnd } = require("../loc");
+const { locStart, locEnd } = require("../loc.js");
 
 function createParser(_parse) {
   const parse = (text, parsers, options) => {

src/language-js/parse/babel.js

@@ -1,14 +1,14 @@
 "use strict";
 
-const tryCombinations = require("../../utils/try-combinations");
+const tryCombinations = require("../../utils/try-combinations.js");
 const {
   getNextNonSpaceNonCommentCharacterIndexWithStartIndex,
   getShebang,
-} = require("../../common/util");
-const createParser = require("./utils/create-parser");
-const createBabelParseError = require("./utils/create-babel-parse-error");
-const postprocess = require("./postprocess");
-const jsonParsers = require("./json");
+} = require("../../common/util.js");
+const createParser = require("./utils/create-parser.js");
+const createBabelParseError = require("./utils/create-babel-parse-error.js");
+const postprocess = require("./postprocess.js");
+const jsonParsers = require("./json.js");
 
 const parseOptions = {
   sourceType: "module",

src/language-js/parse/espree.js

@@ -1,10 +1,10 @@
 "use strict";
 
-const createError = require("../../common/parser-create-error");
-const tryCombinations = require("../../utils/try-combinations");
-const createParser = require("./utils/create-parser");
-const replaceHashbang = require("./utils/replace-hashbang");
-const postprocess = require("./postprocess");
+const createError = require("../../common/parser-create-error.js");
+const tryCombinations = require("../../utils/try-combinations.js");
+const createParser = require("./utils/create-parser.js");
+const replaceHashbang = require("./utils/replace-hashbang.js");
+const postprocess = require("./postprocess.js");
 
 /** @type {import("espree").Options} */
 const parseOptions = {

src/language-js/parse/flow.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createError = require("../../common/parser-create-error");
-const createParser = require("./utils/create-parser");
-const replaceHashbang = require("./utils/replace-hashbang");
-const postprocess = require("./postprocess");
+const createError = require("../../common/parser-create-error.js");
+const createParser = require("./utils/create-parser.js");
+const replaceHashbang = require("./utils/replace-hashbang.js");
+const postprocess = require("./postprocess.js");
 
 // https://github.com/facebook/flow/tree/master/packages/flow-parser#options
 const parseOptions = {

src/language-js/parse/json.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const { isNonEmptyArray } = require("../../common/util");
-const createError = require("../../common/parser-create-error");
-const createParser = require("./utils/create-parser");
-const createBabelParseError = require("./utils/create-babel-parse-error");
+const { isNonEmptyArray } = require("../../common/util.js");
+const createError = require("../../common/parser-create-error.js");
+const createParser = require("./utils/create-parser.js");
+const createBabelParseError = require("./utils/create-babel-parse-error.js");
 
 function createJsonParse(options = {}) {
   const { allowComments = true } = options;

src/language-js/parse/meriyah.js

@@ -1,9 +1,9 @@
 "use strict";
 
-const createError = require("../../common/parser-create-error");
-const tryCombinations = require("../../utils/try-combinations");
-const createParser = require("./utils/create-parser");
-const postprocess = require("./postprocess");
+const createError = require("../../common/parser-create-error.js");
+const tryCombinations = require("../../utils/try-combinations.js");
+const createParser = require("./utils/create-parser.js");
+const postprocess = require("./postprocess.js");
 
 // https://github.com/meriyah/meriyah/blob/4676f60b6c149d7082bde2c9147f9ae2359c8075/src/parser.ts#L185
 const parseOptions = {

src/language-js/parse/parsers.js

@@ -3,66 +3,66 @@
 module.exports = {
   // JS - Babel
   get babel() {
-    return require("./babel").parsers.babel;
+    return require("./babel.js").parsers.babel;
   },
   get "babel-flow"() {
-    return require("./babel").parsers["babel-flow"];
+    return require("./babel.js").parsers["babel-flow"];
   },
   get "babel-ts"() {
-    return require("./babel").parsers["babel-ts"];
+    return require("./babel.js").parsers["babel-ts"];
   },
   get json() {
-    return require("./babel").parsers.json;
+    return require("./babel.js").parsers.json;
   },
   get json5() {
-    return require("./babel").parsers.json5;
+    return require("./babel.js").parsers.json5;
   },
   get "json-stringify"() {
-    return require("./babel").parsers["json-stringify"];
+    return require("./babel.js").parsers["json-stringify"];
   },
   get __js_expression() {
-    return require("./babel").parsers.__js_expression;
+    return require("./babel.js").parsers.__js_expression;
   },
   get __vue_expression() {
-    return require("./babel").parsers.__vue_expression;
+    return require("./babel.js").parsers.__vue_expression;
   },
   get __vue_event_binding() {
-    return require("./babel").parsers.__vue_event_binding;
+    return require("./babel.js").parsers.__vue_event_binding;
   },
   // JS - Flow
   get flow() {
-    return require("./flow").parsers.flow;
+    return require("./flow.js").parsers.flow;
   },
   // JS - TypeScript
   get typescript() {
-    return require("./typescript").parsers.typescript;
+    return require("./typescript.js").parsers.typescript;
   },
   // JS - Angular Action
   get __ng_action() {
-    return require("./angular").parsers.__ng_action;
+    return require("./angular.js").parsers.__ng_action;
   },
   // JS - Angular Binding
   get __ng_binding() {
-    return require("./angular").parsers.__ng_binding;
+    return require("./angular.js").parsers.__ng_binding;
   },
   // JS - Angular Interpolation
   get __ng_interpolation() {
-    return require("./angular").parsers.__ng_interpolation;
+    return require("./angular.js").parsers.__ng_interpolation;
   },
   // JS - Angular Directive
   get __ng_directive() {
-    return require("./angular").parsers.__ng_directive;
+    return require("./angular.js").parsers.__ng_directive;
   },
   // JS - espree
   get espree() {
-    return require("./espree").parsers.espree;
+    return require("./espree.js").parsers.espree;
   },
   // JS - meriyah
   get meriyah() {
-    return require("./meriyah").parsers.meriyah;
+    return require("./meriyah.js").parsers.meriyah;
   },
   // JS - Babel Estree
   get __babel_estree() {
-    return require("./babel").parsers.__babel_estree;
+    return require("./babel.js").parsers.__babel_estree;
   },
 };

src/language-js/parse/postprocess.js

@@ -3,10 +3,10 @@
 const {
   getLast,
   getNextNonSpaceNonCommentCharacter,
-} = require("../../common/util");
-const createError = require("../../common/parser-create-error");
-const { locStart, locEnd } = require("../loc");
-const { isTypeCastComment } = require("../comments");
+} = require("../../common/util.js");
+const createError = require("../../common/parser-create-error.js");
+const { locStart, locEnd } = require("../loc.js");
+const { isTypeCastComment } = require("../comments.js");
 
 function postprocess(ast, options) {
   // Invalid decorators are removed since `@typescript-eslint/typescript-estree` v4

src/language-js/parse/typescript.js

@@ -1,10 +1,10 @@
 "use strict";
 
-const createError = require("../../common/parser-create-error");
-const tryCombinations = require("../../utils/try-combinations");
-const createParser = require("./utils/create-parser");
-const replaceHashbang = require("./utils/replace-hashbang");
-const postprocess = require("./postprocess");
+const createError = require("../../common/parser-create-error.js");
+const tryCombinations = require("../../utils/try-combinations.js");
+const createParser = require("./utils/create-parser.js");
+const replaceHashbang = require("./utils/replace-hashbang.js");
+const postprocess = require("./postprocess.js");
 
 /** @type {import("@typescript-eslint/typescript-estree").TSESTreeOptions} */
 const parseOptions = {

src/language-js/parse/utils/create-babel-parse-error.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const createError = require("../../../common/parser-create-error");
+const createError = require("../../../common/parser-create-error.js");
 
 function createBabelParseError(error) {
   // babel error prints (l:c) with cols that are zero indexed

src/language-js/parse/utils/create-parser.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const { hasPragma } = require("../../pragma");
-const { locStart, locEnd } = require("../../loc");
+const { hasPragma } = require("../../pragma.js");
+const { locStart, locEnd } = require("../../loc.js");
 
 function createParser(options) {
   options = typeof options === "function" ? { parse: options } : options;

src/language-js/pragma.js

@@ -1,8 +1,8 @@
 "use strict";
 
 const { parseWithComments, strip, extract, print } = require("jest-docblock");
-const { getShebang } = require("../common/util");
-const { normalizeEndOfLine } = require("../common/end-of-line");
+const { getShebang } = require("../common/util.js");
+const { normalizeEndOfLine } = require("../common/end-of-line.js");
 
 function parseDocBlock(text) {
   const shebang = getShebang(text);

src/language-js/print/angular.js

@@ -2,9 +2,9 @@
 
 const {
   builders: { join, line, group },
-} = require("../../document");
-const { hasNode, hasComment, getComments } = require("../utils");
-const { printBinaryishExpression } = require("./binaryish");
+} = require("../../document/index.js");
+const { hasNode, hasComment, getComments } = require("../utils.js");
+const { printBinaryishExpression } = require("./binaryish.js");
 
 /** @typedef {import("../../common/ast-path")} AstPath */
 

src/language-js/print/array.js

@@ -1,10 +1,10 @@
 "use strict";
 
-const { printDanglingComments } = require("../../main/comments");
+const { printDanglingComments } = require("../../main/comments.js");
 const {
   builders: { line, softline, hardline, group, indent, ifBreak, fill },
-} = require("../../document");
-const { getLast, hasNewline } = require("../../common/util");
+} = require("../../document/index.js");
+const { getLast, hasNewline } = require("../../common/util.js");
 const {
   shouldPrintComma,
   hasComment,
@@ -12,10 +12,10 @@ const {
   isNextLineEmpty,
   isNumericLiteral,
   isSignedNumericLiteral,
-} = require("../utils");
-const { locStart } = require("../loc");
+} = require("../utils.js");
+const { locStart } = require("../loc.js");
 
-const { printOptionalToken, printTypeAnnotation } = require("./misc");
+const { printOptionalToken, printTypeAnnotation } = require("./misc.js");
 
 /** @typedef {import("../../document").Doc} Doc */
 

src/language-js/print/assignment.js

@@ -1,10 +1,10 @@
 "use strict";
 
-const { isNonEmptyArray, getStringWidth } = require("../../common/util");
+const { isNonEmptyArray, getStringWidth } = require("../../common/util.js");
 const {
   builders: { line, group, indent, indentIfBreak },
   utils: { cleanDoc, willBreak },
-} = require("../../document");
+} = require("../../document/index.js");
 const {
   hasLeadingOwnLineComment,
   isBinaryish,
@@ -18,9 +18,9 @@ const {
   hasComment,
   isSignedNumericLiteral,
   isObjectProperty,
-} = require("../utils");
-const { shouldInlineLogicalExpression } = require("./binaryish");
-const { printCallExpression } = require("./call-expression");
+} = require("../utils.js");
+const { shouldInlineLogicalExpression } = require("./binaryish.js");
+const { printCallExpression } = require("./call-expression.js");
 
 function printAssignment(
   path,

src/language-js/print/binaryish.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const { printComments } = require("../../main/comments");
-const { getLast } = require("../../common/util");
+const { printComments } = require("../../main/comments.js");
+const { getLast } = require("../../common/util.js");
 const {
   builders: {
     join,
@@ -14,7 +14,7 @@ const {
     indentIfBreak,
   },
   utils: { cleanDoc, getDocParts, isConcat },
-} = require("../../document");
+} = require("../../document/index.js");
 const {
   hasLeadingOwnLineComment,
   isBinaryish,
@@ -25,7 +25,7 @@ const {
   isCallExpression,
   isMemberExpression,
   isObjectProperty,
-} = require("../utils");
+} = require("../utils.js");
 
 /** @typedef {import("../../document").Doc} Doc */
 

src/language-js/print/block.js

@@ -1,14 +1,18 @@
 "use strict";
 
-const { printDanglingComments } = require("../../main/comments");
-const { isNonEmptyArray } = require("../../common/util");
+const { printDanglingComments } = require("../../main/comments.js");
+const { isNonEmptyArray } = require("../../common/util.js");
 const {
   builders: { hardline, indent },
-} = require("../../document");
-const { hasComment, CommentCheckFlags, isNextLineEmpty } = require("../utils");
-const { printHardlineAfterHeritage } = require("./class");
+} = require("../../document/index.js");
+const {
+  hasComment,
+  CommentCheckFlags,
+  isNextLineEmpty,
+} = require("../utils.js");
+const { printHardlineAfterHeritage } = require("./class.js");
 
-const { printBody } = require("./statement");
+const { printBody } = require("./statement.js");
 
 /** @typedef {import("../../document").Doc} Doc */
 

src/language-js/print/call-arguments.js

@@ -1,7 +1,7 @@
 "use strict";
 
-const { printDanglingComments } = require("../../main/comments");
-const { getLast, getPenultimate } = require("../../common/util");
+const { printDanglingComments } = require("../../main/comments.js");
+const { getLast, getPenultimate } = require("../../common/util.js");
 const {
   getFunctionParameters,
   hasComment,
@@ -16,7 +16,7 @@ const {
   isCallExpression,
   isStringLiteral,
   isObjectProperty,
-} = require("../utils");
+} = require("../utils.js");
 
 const {
   builders: {
@@ -30,10 +30,10 @@ const {
     breakParent,
   },
   utils: { willBreak },
-} = require("../../document");
+} = require("../../document/index.js");
 
-const { ArgExpansionBailout } = require("../../common/errors");
-const { isConciselyPrintedArray } = require("./array");
+const { ArgExpansionBailout } = require("../../common/errors.js");
+const { isConciselyPrintedArray } = require("./array.js");
 
 function printCallArguments(path, options, print) {
   const node = path.getValue();