feat: add support for TLA on node 14.3 and newer

.github/workflows/nodejs.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.19, 12.4, 12.8, 13.11, 14]
+        node-version: [10.19, 12.4, 12.8, 13.11, 14.3, 14, 15]
 
     steps:
     - uses: actions/checkout@v2

package.json

@@ -25,16 +25,16 @@
     "@babel/plugin-syntax-numeric-separator": "^7.8.3",
     "@babel/plugin-syntax-object-rest-spread": "^7.8.3",
     "@babel/plugin-syntax-optional-catch-binding": "^7.8.3",
-    "@babel/plugin-syntax-optional-chaining": "^7.8.3"
+    "@babel/plugin-syntax-optional-chaining": "^7.8.3",
+    "@babel/plugin-syntax-top-level-await": "^7.8.3"
   },
   "peerDependencies": {
     "@babel/core": "^7.0.0"
   },
   "devDependencies": {
-    "@babel/core": "7.0.0"
-  },
-  "resolutions": {
-    "@babel/parser": "7.0.0"
+    "@babel/core": "7.0.0",
+    "@babel/parser-7.0.0": "npm:@babel/parser@7.0.0",
+    "@babel/parser-7.9.0": "npm:@babel/parser@7.9.0"
   },
   "license": "MIT"
 }

src/index.js

@@ -45,8 +45,13 @@ for (const [name, cases] of Object.entries(tests)) {
 // runtime. It is supported starting from 10.4, so we can check the version.
 const major = parseInt(process.versions.node, 10);
 const minor = parseInt(process.versions.node.match(/^\d+\.(\d+)/)[1], 10);
-if (major > 10 || (major === 10 && minor > 4)) {
+if (major > 10 || (major === 10 && minor >= 4)) {
   plugins.push(require.resolve("@babel/plugin-syntax-import-meta"));
 }
+// Same for top level await - it is only supported in modules. It is supported
+// from 14.3.0
+if (major > 14 || (major === 14 && minor >= 3)) {
+  plugins.push(require.resolve("@babel/plugin-syntax-top-level-await"));
+}
 
 module.exports = () => ({ plugins });

test/fixtures.json

@@ -1,5 +1,5 @@
 {
-  "#______name_______": [ "min node version", "code" ],
+  "#______name_______": [ "min node version", "code", "@babel/parser" ],
   "object rest/spread": [8.6, "({...x})"],
   "async generators": [10.0, "async function* f() {}"],
   "optional catch binding": [10.0, "try {} catch {}"],
@@ -10,5 +10,6 @@
   "numeric separators": [12.7, "1_2"],
   "optional chaining": [14.0, "a?.b"],
   "nullish coalescing": [14.0, "a ?? b"],
-  "import.meta": [10.4, "import.meta"]
+  "import.meta": [10.4, "import.meta"],
+  "top level await": [14.3, "await Promise.resolve()", "@babel/parser-7.9.0"]
 }

test/index.js

@@ -1,4 +1,3 @@
-const fs = require("fs");
 const babel = require("@babel/core");
 const thisPreset = require("..");
 
@@ -9,14 +8,18 @@ const currentVersion = parseVersion(process.version);
 
 console.log(`INFO - Running on node ${process.version}`);
 
-for (const [name, [version, code]] of Object.entries(fixtures)) {
+for (const [name, [version, code, parser]] of Object.entries(fixtures)) {
   if (name.startsWith("#")) continue; // "JSON comments"
 
   const shouldThrow = parseVersion(version) > currentVersion;
   let didThrow = false;
 
   try {
-    babel.parseSync(code, { configFile: false, presets: [thisPreset] });
+    babel.parseSync(code, {
+      configFile: false,
+      presets: [thisPreset],
+      plugins: [selectParser(parser)],
+    });
   } catch {
     didThrow = true;
   }
@@ -30,6 +33,12 @@ for (const [name, [version, code]] of Object.entries(fixtures)) {
   }
 }
 
+function selectParser(version = "@babel/parser-7.0.0") {
+  return () => ({
+    parserOverride: require(version).parse
+  });
+}
+
 function parseVersion(v) {
   const { major, minor = 0, patch = 0 } = String(v).match(VERSION_RE).groups;
   return Number(major) * 1e8 + Number(minor) * 1e4 + Number(patch);

yarn.lock

@@ -68,10 +68,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/helper-plugin-utils@npm:^7.8.0, @babel/helper-plugin-utils@npm:^7.8.3":
-  version: 7.8.3
-  resolution: "@babel/helper-plugin-utils@npm:7.8.3"
-  checksum: 56f09626f24511aadd36a96aacd8658274ededc2e94f5e85bb6e51c9e6ad72eb1dd9f9a28a4ee5a8691de7601cf2a8e63ce235db01dda8964779940281f2787f
+"@babel/helper-plugin-utils@npm:^7.10.4, @babel/helper-plugin-utils@npm:^7.8.0, @babel/helper-plugin-utils@npm:^7.8.3":
+  version: 7.10.4
+  resolution: "@babel/helper-plugin-utils@npm:7.10.4"
+  checksum: 9f617e619a3557cb5fae8885e91cd94ba4ee16fb345e0360de0d7dc037efb10cc604939ecc1038ccdb71aa37e7e78f20133d7bbbebecb8f6dcdb557650366d92
   languageName: node
   linkType: hard
 
@@ -113,7 +113,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/parser@npm:7.0.0":
+"@babel/parser-7.0.0@npm:@babel/parser@7.0.0":
   version: 7.0.0
   resolution: "@babel/parser@npm:7.0.0"
   bin:
@@ -122,6 +122,24 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@babel/parser-7.9.0@npm:@babel/parser@7.9.0":
+  version: 7.9.0
+  resolution: "@babel/parser@npm:7.9.0"
+  bin:
+    parser: ./bin/babel-parser.js
+  checksum: e7ba36d98b00784a6866cb64a166eafc17d0e845d20b340a782a5d8715a967ecc2d868cb92b600840441bd3ac82e76d05d192f5db6de2eb4bce04f5f56c4765e
+  languageName: node
+  linkType: hard
+
+"@babel/parser@npm:^7.0.0, @babel/parser@npm:^7.8.6, @babel/parser@npm:^7.9.0":
+  version: 7.12.3
+  resolution: "@babel/parser@npm:7.12.3"
+  bin:
+    parser: ./bin/babel-parser.js
+  checksum: 3605bcf97e956ef36506ccb7e0ca4432025d8992c7e1f5d5b03976750a1198a0b27f461ab9304dbc5319a154b5ea19c09e72f87bfc5c08dd2780428734e13339
+  languageName: node
+  linkType: hard
+
 "@babel/plugin-syntax-async-generators@npm:^7.8.4":
   version: 7.8.4
   resolution: "@babel/plugin-syntax-async-generators@npm:7.8.4"
@@ -243,6 +261,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@babel/plugin-syntax-top-level-await@npm:^7.8.3":
+  version: 7.12.1
+  resolution: "@babel/plugin-syntax-top-level-await@npm:7.12.1"
+  dependencies:
+    "@babel/helper-plugin-utils": ^7.10.4
+  peerDependencies:
+    "@babel/core": ^7.0.0-0
+  checksum: 9767e46ddc1add9133a21f5d6c4452e9a62f891fe1db5d8291f62f9036f9e697bc118adad43109a8740ac15769e9489d68d134b17cfe9f3bdf06d2c50c9c6dce
+  languageName: node
+  linkType: hard
+
 "@babel/template@npm:^7.0.0, @babel/template@npm:^7.8.3":
   version: 7.8.6
   resolution: "@babel/template@npm:7.8.6"
@@ -296,6 +325,8 @@ __metadata:
   resolution: "babel-preset-current-node-syntax@workspace:."
   dependencies:
     "@babel/core": 7.0.0
+    "@babel/parser-7.0.0": "npm:@babel/parser@7.0.0"
+    "@babel/parser-7.9.0": "npm:@babel/parser@7.9.0"
     "@babel/plugin-syntax-async-generators": ^7.8.4
     "@babel/plugin-syntax-bigint": ^7.8.3
     "@babel/plugin-syntax-class-properties": ^7.8.3
@@ -307,6 +338,7 @@ __metadata:
     "@babel/plugin-syntax-object-rest-spread": ^7.8.3
     "@babel/plugin-syntax-optional-catch-binding": ^7.8.3
     "@babel/plugin-syntax-optional-chaining": ^7.8.3
+    "@babel/plugin-syntax-top-level-await": ^7.8.3
   peerDependencies:
     "@babel/core": ^7.0.0
   languageName: unknown
@@ -373,6 +405,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"function-bind@npm:^1.1.1":
+  version: 1.1.1
+  resolution: "function-bind@npm:1.1.1"
+  checksum: ffad86e7d2010ba179aaa6a3987d2cc0ed48fa92d27f1ed84bfa06d14f77deeed5bfbae7f00bdebc0c54218392cab2b18ecc080e2c72f592431927b87a27d42b
+  languageName: node
+  linkType: hard
+
 "globals@npm:^11.1.0":
   version: 11.12.0
   resolution: "globals@npm:11.12.0"
@@ -387,6 +426,24 @@ __metadata:
   languageName: node
   linkType: hard
 
+"has@npm:^1.0.3":
+  version: 1.0.3
+  resolution: "has@npm:1.0.3"
+  dependencies:
+    function-bind: ^1.1.1
+  checksum: c686e15300d41364486c099a9259d9c418022c294244843dcd712c4c286ff839d4f23a25413baa28c4d2c1e828afc2aaab70f685400b391533980223c71fa1ca
+  languageName: node
+  linkType: hard
+
+"is-core-module@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "is-core-module@npm:2.0.0"
+  dependencies:
+    has: ^1.0.3
+  checksum: de99dfbdf14d254f6d078aa37113512295acef3cfff5fb39fdf8020b04788535eae6da39e02b0c4ad07f7bc79594de8d5aeb4fce66f97feb9c597d7d6d6d43d4
+  languageName: node
+  linkType: hard
+
 "js-tokens@npm:^4.0.0":
   version: 4.0.0
   resolution: "js-tokens@npm:4.0.0"
@@ -434,20 +491,22 @@ __metadata:
   linkType: hard
 
 resolve@^1.3.2:
-  version: 1.15.1
-  resolution: "resolve@npm:1.15.1"
+  version: 1.18.1
+  resolution: "resolve@npm:1.18.1"
   dependencies:
+    is-core-module: ^2.0.0
     path-parse: ^1.0.6
-  checksum: 34f77287b44a7eb4588d9d631165c763099a82aca3132920e0fdcde428a51f2cf69190c19e2309e35288a0702f57fefeb951da6138677036a16636b2f0e7b8dd
+  checksum: deb5ba746e1c038ba8fb7ca5c35ee3fe88665e2f79be3e9a706e5254eeea55eb12b6f1830dd60a11bbafa327bcd868284fbf5caf428cf5761b3f094abdffee77
   languageName: node
   linkType: hard
 
 "resolve@patch:resolve@^1.3.2#builtin<compat/resolve>":
-  version: 1.15.1
-  resolution: "resolve@patch:resolve@npm%3A1.15.1#builtin<compat/resolve>::version=1.15.1&hash=3388aa"
+  version: 1.18.1
+  resolution: "resolve@patch:resolve@npm%3A1.18.1#builtin<compat/resolve>::version=1.18.1&hash=3388aa"
   dependencies:
+    is-core-module: ^2.0.0
     path-parse: ^1.0.6
-  checksum: 6588c8a8735d8b2a00cfee2a325538f325ae5e48653490882d3e8afe6124f25c25d60ec09864f30a03c4471a3201c9cfba0e14ca0f74f626ac4b5c8d2e42c2c2
+  checksum: 9e62d2803ad1ec21b13780cc6a45b72bb7b6525eb5b44f0ede7cde37c00a8eb310c06ebfcc7de7dc10c2234d7d271bc4f1eed9783fb87acac141597cd4efaeec
   languageName: node
   linkType: hard