Update test suite to Node.js 13.x without esm (#40)

* upgrade tests for Node.js 13

* 13 testing

* update build script to modules

Author: guybedford

.travis.yml

@@ -2,7 +2,7 @@ git:
   depth: 1
 language: node_js
 node_js:
-  - '10'
+  - '13'
 
 before_install:
   - npm install

build.js

@@ -1,5 +1,5 @@
-const fs = require('fs');
-const terser = require('terser');
+import fs from 'fs';
+import terser from 'terser';
 
 const MINIFY = true;
 

package.json

@@ -5,7 +5,7 @@
   "main": "dist/lexer.cjs",
   "module": "dist/lexer.js",
   "scripts": {
-    "test": "mocha -r esm -b -u tdd test/*.js",
+    "test": "mocha -b -u tdd test/*.cjs",
     "build": "node build.js && babel dist/lexer.js | terser -o dist/lexer.cjs",
     "build-wasm": "make lib/lexer.wasm && node build.js",
     "bench": "node --experimental-modules --expose-gc bench/index.js",
@@ -18,7 +18,6 @@
     "@babel/cli": "^7.5.5",
     "@babel/core": "^7.5.5",
     "@babel/plugin-transform-modules-commonjs": "^7.5.0",
-    "esm": "^3.0.84",
     "kleur": "^2.0.2",
     "mocha": "^5.2.0",
     "terser": "^4.1.4"

src/lexer.c

@@ -228,8 +228,8 @@ void tryParseExportStatement () {
         ch = commentWhitespace();
         const char16_t* startPos = pos;
         ch = readToWsOrPunctuator(ch);
-        // stops on [ { destructurings
-        if (ch == '{' || ch == '[') {
+        // stops on [ { destructurings or =
+        if (ch == '{' || ch == '[' || ch == '=') {
           pos--;
           return;
         }

test/_unit.js test/_unit.cjs

@@ -1,5 +1,11 @@
-import assert from 'assert';
-import { parse, init } from '../dist/lexer.js';
+const assert = require('assert');
+
+let parse;
+const init = (async () => {
+  let init;
+  ({ parse, init } = await import('../dist/lexer.js'));
+  await init;
+})();
 
 suite('Invalid syntax', () => {
   beforeEach(async () => await init);

test/integration.js test/integration.cjs

@@ -1,6 +1,12 @@
-import assert from 'assert';
-import fs from 'fs';
-import { parse, init } from '../dist/lexer.js';
+const fs = require('fs');
+const assert = require('assert');
+
+let parse;
+const init = (async () => {
+  let init;
+  ({ parse, init } = await import('../dist/lexer.js'));
+  await init;
+})();
 
 const files = fs.readdirSync('test/samples')
 	.map(f => `test/samples/${f}`)